package category is not useful (#7637)

package.category doesn't make a lot of sense in the richer world of dependency groups. The only use that is made of the category in poetry and poetry-core is that it is written to and read back from the lockfile. But no use is made of that information.

package category is not useful (#7637)
package.category doesn't make a lot of sense in the richer world of dependency groups. The only use that is made of the category in poetry and poetry-core is that it is written to and read back from the lockfile. But no use is made of that information.
a770b3ac · David Hotham · GitHub · ec35b837 · a770b3ac · a770b3ac
Commit a770b3ac authored Apr 18, 2023 by David Hotham Committed by GitHub Apr 18, 2023
47 changed files
--- a/src/poetry/packages/locker.py
+++ b/src/poetry/packages/locker.py
@@ -126,7 +126,6 @@ class Locker:
                source_subdirectory=source.get("subdirectory"),
            )
            package.description = info.get("description", "")
-            package.category = info.get("category", "main")
            package.optional = info["optional"]
            metadata = cast("dict[str, Any]", lock_data["metadata"])

@@ -425,7 +424,6 @@ class Locker:
            "name": package.pretty_name,
            "version": package.pretty_version,
            "description": package.description or "",
-            "category": package.category,
            "optional": package.optional,
            "python-versions": package.python_versions,
            "files": sorted(

--- a/src/poetry/puzzle/solver.py
+++ b/src/poetry/puzzle/solver.py
@@ -9,8 +9,6 @@ from typing import FrozenSet
 from typing import Tuple
 from typing import TypeVar

-from poetry.core.packages.dependency_group import MAIN_GROUP
-
 from poetry.mixology import resolve_version
 from poetry.mixology.failure import SolveFailure
 from poetry.puzzle.exceptions import OverrideNeeded
@@ -273,11 +271,9 @@ class PackageNode(DFSNode):
        self.depth = -1

        if not previous:
-            self.category = "dev"
            self.groups: frozenset[str] = frozenset()
            self.optional = True
        elif dep:
-            self.category = "main" if MAIN_GROUP in dep.groups else "dev"
            self.groups = dep.groups
            self.optional = dep.is_optional()
        else:
@@ -327,14 +323,11 @@ def aggregate_package_nodes(nodes: list[PackageNode]) -> tuple[Package, int]:
    for node in nodes:
        groups.extend(node.groups)

-    category = "main" if any(MAIN_GROUP in node.groups for node in nodes) else "dev"
    optional = all(node.optional for node in nodes)
    for node in nodes:
        node.depth = depth
-        node.category = category
        node.optional = optional

-    package.category = category
    package.optional = optional

    return package, depth
--- a/tests/console/commands/self/test_remove_plugins.py
+++ b/tests/console/commands/self/test_remove_plugins.py
@@ -45,7 +45,6 @@ def install_plugin(installed: Repository) -> None:
            {
                "name": "poetry-plugin",
                "version": "1.2.3",
-                "category": "main",
                "optional": False,
                "platform": "*",
                "python-versions": "*",

--- a/tests/console/commands/test_show.py
+++ b/tests/console/commands/test_show.py
--- a/tests/fixtures/deleted_directory_dependency/poetry.lock
+++ b/tests/fixtures/deleted_directory_dependency/poetry.lock
@@ -4,7 +4,6 @@
 name = "missing"
 version = "1.2.3"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/fixtures/deleted_file_dependency/poetry.lock
+++ b/tests/fixtures/deleted_file_dependency/poetry.lock
@@ -4,7 +4,6 @@
 name = "missing"
 version = "1.2.3"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/fixtures/missing_directory_dependency/poetry.lock
+++ b/tests/fixtures/missing_directory_dependency/poetry.lock
@@ -4,7 +4,6 @@
 name = "missing"
 version = "1.2.3"
 description = ""
-category = "dev"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/fixtures/missing_file_dependency/poetry.lock
+++ b/tests/fixtures/missing_file_dependency/poetry.lock
@@ -4,7 +4,6 @@
 name = "missing"
 version = "1.2.3"
 description = ""
-category = "dev"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/fixtures/old_lock/poetry.lock
+++ b/tests/fixtures/old_lock/poetry.lock
 [[package]]
-category = "main"
 description = "A sample Python project"
 name = "sampleproject"
 optional = false

--- a/tests/fixtures/old_lock_path_dependency/poetry.lock
+++ b/tests/fixtures/old_lock_path_dependency/poetry.lock
@@ -4,7 +4,6 @@
 name = "quix"
 version = "1.2.3"
 description = "Some description."
-category = "main"
 optional = false
 python-versions = "~2.7 || ^3.4"
 files = []

--- a/tests/fixtures/outdated_lock/poetry.lock
+++ b/tests/fixtures/outdated_lock/poetry.lock
@@ -2,7 +2,6 @@
 name = "certifi"
 version = "2020.6.20"
 description = "Python package for providing Mozilla's CA Bundle."
-category = "main"
 optional = false
 python-versions = "*"

@@ -18,7 +17,6 @@ hash = "sha256:5930595817496dd21bb8dc35dad090f1c2cd0adfaf21204bf6732ca5d8ee34d3"
 name = "chardet"
 version = "3.0.4"
 description = "Universal encoding detector for Python 2 and 3"
-category = "main"
 optional = false
 python-versions = "*"

@@ -34,7 +32,6 @@ hash = "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae"
 name = "docker"
 version = "4.3.0"
 description = "A Python library for the Docker Engine API."
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"

@@ -60,7 +57,6 @@ tls = ["pyOpenSSL (>=17.5.0)", "cryptography (>=1.3.4)", "idna (>=2.0.0)"]
 name = "idna"
 version = "2.10"
 description = "Internationalized Domain Names in Applications (IDNA)"
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"

@@ -76,7 +72,6 @@ hash = "sha256:b307872f855b18632ce0c21c5e45be78c0ea7ae4c15c828c20788b26921eb3f6"
 name = "pywin32"
 version = "227"
 description = "Python for Window Extensions"
-category = "main"
 optional = false
 python-versions = "*"

@@ -132,7 +127,6 @@ hash = "sha256:f27cec5e7f588c3d1051651830ecc00294f90728d19c3bf6916e6dba93ea357c"
 name = "requests"
 version = "2.24.0"
 description = "Python HTTP for Humans."
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"

@@ -158,7 +152,6 @@ socks = ["PySocks (>=1.5.6,<1.5.7 || >1.5.7)", "win-inet-pton"]
 name = "six"
 version = "1.15.0"
 description = "Python 2 and 3 compatibility utilities"
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"

@@ -174,7 +167,6 @@ hash = "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259"
 name = "urllib3"
 version = "1.25.10"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"

@@ -195,7 +187,6 @@ socks = ["PySocks (>=1.5.6,<1.5.7 || >1.5.7,<2.0)"]
 name = "websocket-client"
 version = "0.57.0"
 description = "WebSocket client for Python. hybi13 is supported."
-category = "main"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"


--- a/tests/fixtures/up_to_date_lock/poetry.lock
+++ b/tests/fixtures/up_to_date_lock/poetry.lock
@@ -2,7 +2,6 @@
 name = "certifi"
 version = "2020.12.5"
 description = "Python package for providing Mozilla's CA Bundle."
-category = "main"
 optional = false
 python-versions = "*"

@@ -18,7 +17,6 @@ hash = "sha256:1a4995114262bffbc2413b159f2a1a480c969de6e6eb13ee966d470af86af59c"
 name = "chardet"
 version = "4.0.0"
 description = "Universal encoding detector for Python 2 and 3"
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"

@@ -34,7 +32,6 @@ hash = "sha256:0d6f53a15db4120f2b08c94f11e7d93d2c911ee118b6b30a04ec3ee8310179fa"
 name = "docker"
 version = "4.3.1"
 description = "A Python library for the Docker Engine API."
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"

@@ -60,7 +57,6 @@ tls = ["pyOpenSSL (>=17.5.0)", "cryptography (>=1.3.4)", "idna (>=2.0.0)"]
 name = "idna"
 version = "2.10"
 description = "Internationalized Domain Names in Applications (IDNA)"
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"

@@ -76,7 +72,6 @@ hash = "sha256:b307872f855b18632ce0c21c5e45be78c0ea7ae4c15c828c20788b26921eb3f6"
 name = "pywin32"
 version = "227"
 description = "Python for Window Extensions"
-category = "main"
 optional = false
 python-versions = "*"

@@ -132,7 +127,6 @@ hash = "sha256:f27cec5e7f588c3d1051651830ecc00294f90728d19c3bf6916e6dba93ea357c"
 name = "requests"
 version = "2.25.1"
 description = "Python HTTP for Humans."
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"

@@ -158,7 +152,6 @@ socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]
 name = "six"
 version = "1.15.0"
 description = "Python 2 and 3 compatibility utilities"
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"

@@ -174,7 +167,6 @@ hash = "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259"
 name = "urllib3"
 version = "1.26.3"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"

@@ -195,7 +187,6 @@ socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 name = "websocket-client"
 version = "0.58.0"
 description = "WebSocket client for Python with low level API options"
-category = "main"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"


--- a/tests/installation/fixtures/extras-with-dependencies.test
+++ b/tests/installation/fixtures/extras-with-dependencies.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -11,7 +10,6 @@ files = []
 name = "B"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -20,7 +18,6 @@ files = []
 name = "C"
 version = "1.0"
 description = ""
-category = "main"
 optional = true
 python-versions = "*"
 files = []
@@ -32,7 +29,6 @@ D = "^1.0"
 name = "D"
 version = "1.1"
 description = ""
-category = "main"
 optional = true
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/extras.test
+++ b/tests/installation/fixtures/extras.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -11,7 +10,6 @@ files = []
 name = "B"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -20,7 +18,6 @@ files = []
 name = "C"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -29,7 +26,6 @@ files = []
 name = "D"
 version = "1.1"
 description = ""
-category = "main"
 optional = true
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/install-no-dev.test
+++ b/tests/installation/fixtures/install-no-dev.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -11,7 +10,6 @@ files = []
 name = "B"
 version = "1.1"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -20,7 +18,6 @@ files = []
 name = "C"
 version = "1.2"
 description = ""
-category = "dev"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/old-lock.test
+++ b/tests/installation/fixtures/old-lock.test
@@ -2,7 +2,6 @@
 name = "attrs"
 version = "17.4.0"
 description = "Classes Without Boilerplate"
-category = "dev"
 optional = false
 python-versions = "*"

@@ -15,7 +14,6 @@ tests = ["coverage", "hypothesis", "pympler", "pytest", "six", "zope.interface"]
 name = "colorama"
 version = "0.3.9"
 description = "Cross-platform colored terminal text."
-category = "dev"
 marker = "sys_platform == \"win32\""
 optional = false
 python-versions = "*"
@@ -24,7 +22,6 @@ python-versions = "*"
 name = "funcsigs"
 version = "1.0.2"
 description = "Python function signatures from PEP362 for Python 2.6, 2.7 and 3.2+"
-category = "dev"
 marker = "python_version < \"3.0\""
 optional = false
 python-versions = "*"
@@ -33,7 +30,6 @@ python-versions = "*"
 name = "more-itertools"
 version = "4.1.0"
 description = "More routines for operating on iterables, beyond itertools"
-category = "dev"
 optional = false
 python-versions = "*"

@@ -44,7 +40,6 @@ six = ">=1.0.0,<2.0.0"
 name = "pluggy"
 version = "0.6.0"
 description = "plugin and hook calling mechanisms for python"
-category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"

@@ -52,7 +47,6 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 name = "py"
 version = "1.5.3"
 description = "library with cross-python path, ini-parsing, io, code, log facilities"
-category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"

@@ -60,7 +54,6 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 name = "pytest"
 version = "3.5.0"
 description = "pytest: simple powerful testing with Python"
-category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"

@@ -77,7 +70,6 @@ colorama = "*"
 name = "six"
 version = "1.11.0"
 description = "Python 2 and 3 compatibility utilities"
-category = "dev"
 optional = false
 python-versions = "*"


--- a/tests/installation/fixtures/remove.test
+++ b/tests/installation/fixtures/remove.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/update-with-lock.test
+++ b/tests/installation/fixtures/update-with-lock.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.1"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/update-with-locked-extras.test
+++ b/tests/installation/fixtures/update-with-locked-extras.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -18,7 +17,6 @@ foo = ["B"]
 name = "B"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -27,7 +25,6 @@ files = []
 name = "C"
 version = "1.1"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -36,7 +33,6 @@ files = []
 name = "D"
 version = "1.1"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/with-category-change.test
+++ b/tests/installation/fixtures/with-category-change.test
-[[package]]
-name = "A"
-version = "1.0"
-description = ""
-category = "main"
-optional = false
-python-versions = "*"
-files = []
-
-[[package]]
-name = "B"
-version = "1.1"
-description = ""
-category = "main"
-optional = false
-python-versions = "*"
-files = []
-
-[package.dependencies]
-A = "^1.0"
-
-[metadata]
-python-versions = "*"
-lock-version = "2.0"
-content-hash = "123456789"
--- a/tests/installation/fixtures/with-conditional-dependency.test
+++ b/tests/installation/fixtures/with-conditional-dependency.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.0.0"
 description = ""
-category = "main"
 optional = false
 python-versions = ">=3.5"
 files = []
@@ -14,7 +13,6 @@ python = ">=3.5,<4.0"
 name = "A"
 version = "1.0.1"
 description = ""
-category = "main"
 optional = false
 python-versions = ">=3.6"
 files = []

--- a/tests/installation/fixtures/with-dependencies-extras.test
+++ b/tests/installation/fixtures/with-dependencies-extras.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -11,7 +10,6 @@ files = []
 name = "B"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -26,7 +24,6 @@ foo = ["C (>=1.0,<2.0)"]
 name = "C"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/with-dependencies-nested-extras.test
+++ b/tests/installation/fixtures/with-dependencies-nested-extras.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -17,7 +16,6 @@ b = ["B[c] (>=1.0,<2.0)"]
 name = "B"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -32,7 +30,6 @@ c = ["C (>=1.0,<2.0)"]
 name = "C"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/with-dependencies.test
+++ b/tests/installation/fixtures/with-dependencies.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -11,7 +10,6 @@ files = []
 name = "B"
 version = "1.1"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/with-directory-dependency-poetry-transitive.test
+++ b/tests/installation/fixtures/with-directory-dependency-poetry-transitive.test
 [[package]]
-category = "main"
 description = ""
 name = "demo"
 optional = false
@@ -22,7 +21,6 @@ type = "file"
 url = "../distributions/demo-0.1.0-py2.py3-none-any.whl"

 [[package]]
-category = "main"
 description = "This is a description"
 develop = false
 name = "inner-directory-project"
@@ -36,7 +34,6 @@ type = "directory"
 url = "project_with_transitive_file_dependencies/inner-directory-project"

 [[package]]
-category = "main"
 description = ""
 name = "pendulum"
 optional = false
@@ -45,7 +42,6 @@ files = []
 version = "1.4.4"

 [[package]]
-category = "main"
 description = "This is a description"
 develop = false
 name = "project-with-extras"
@@ -63,7 +59,6 @@ type = "directory"
 url = "../project_with_extras"

 [[package]]
-category = "main"
 description = "This is a description"
 develop = false
 name = "project-with-transitive-directory-dependencies"
@@ -81,7 +76,6 @@ type = "directory"
 url = "project_with_transitive_directory_dependencies"

 [[package]]
-category = "main"
 description = "This is a description"
 develop = false
 name = "project-with-transitive-file-dependencies"

--- a/tests/installation/fixtures/with-directory-dependency-poetry.test
+++ b/tests/installation/fixtures/with-directory-dependency-poetry.test
 [[package]]
 description = ""
-category = "main"
 name = "pendulum"
 optional = false
 python-versions = "*"
@@ -8,7 +7,6 @@ files = []
 version = "1.4.4"

 [[package]]
-category = "main"
 description = "This is a description"
 develop = false
 name = "project-with-extras"

--- a/tests/installation/fixtures/with-directory-dependency-setuptools.test
+++ b/tests/installation/fixtures/with-directory-dependency-setuptools.test
@@ -2,7 +2,6 @@
 name = "cachy"
 version = "0.2.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -11,7 +10,6 @@ files = []
 name = "pendulum"
 version = "1.4.4"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -21,7 +19,6 @@ name = "project-with-setup"
 version = "0.1.2"
 develop = false
 description = "Demo project."
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/with-duplicate-dependencies-update.test
+++ b/tests/installation/fixtures/with-duplicate-dependencies-update.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.1"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -14,7 +13,6 @@ B = "^2.0"
 name = "B"
 version = "2.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -26,7 +24,6 @@ C = "1.5"
 name = "C"
 version = "1.5"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/with-duplicate-dependencies.test
+++ b/tests/installation/fixtures/with-duplicate-dependencies.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -17,7 +16,6 @@ B = [
 name = "B"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -29,7 +27,6 @@ C = "1.2"
 name = "B"
 version = "2.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -41,7 +38,6 @@ C = "1.5"
 name = "C"
 version = "1.2"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -50,7 +46,6 @@ files = []
 name = "C"
 version = "1.5"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/with-file-dependency-transitive.test
+++ b/tests/installation/fixtures/with-file-dependency-transitive.test
 [[package]]
-category = "main"
 description = ""
 name = "demo"
 optional = false
@@ -22,7 +21,6 @@ type = "file"
 url = "../distributions/demo-0.1.0-py2.py3-none-any.whl"

 [[package]]
-category = "main"
 description = "This is a description"
 develop = false
 name = "inner-directory-project"
@@ -36,7 +34,6 @@ type = "directory"
 url = "project_with_transitive_file_dependencies/inner-directory-project"

 [[package]]
-category = "main"
 description = ""
 name = "pendulum"
 optional = false
@@ -45,7 +42,6 @@ files = []
 version = "1.4.4"

 [[package]]
-category = "main"
 description = "This is a description"
 develop = false
 name = "project-with-transitive-file-dependencies"

--- a/tests/installation/fixtures/with-file-dependency.test
+++ b/tests/installation/fixtures/with-file-dependency.test
@@ -2,7 +2,6 @@
 name = "demo"
 version = "0.1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"

@@ -25,7 +24,6 @@ foo = ["cleo"]
 name = "pendulum"
 version = "1.4.4"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/with-multiple-updates.test
+++ b/tests/installation/fixtures/with-multiple-updates.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.1"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -18,7 +17,6 @@ C = [
 name = "B"
 version = "1.1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -27,7 +25,6 @@ files = []
 name = "C"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -36,7 +33,6 @@ files = []
 name = "C"
 version = "2.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/with-optional-dependencies.test
+++ b/tests/installation/fixtures/with-optional-dependencies.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.0"
 description = ""
-category = "main"
 optional = true
 python-versions = "*"
 files = []
@@ -11,7 +10,6 @@ files = []
 name = "C"
 version = "1.3"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -23,7 +21,6 @@ D = "^1.2"
 name = "D"
 version = "1.4"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/with-platform-dependencies.test
+++ b/tests/installation/fixtures/with-platform-dependencies.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.0"
 description = ""
-category = "main"
 optional = true
 python-versions = "*"
 files = []
@@ -11,7 +10,6 @@ files = []
 name = "B"
 version = "1.1"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -20,7 +18,6 @@ files = []
 name = "C"
 version = "1.3"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -32,7 +29,6 @@ D = "^1.2"
 name = "D"
 version = "1.4"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/with-prereleases.test
+++ b/tests/installation/fixtures/with-prereleases.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.0a2"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -11,7 +10,6 @@ files = []
 name = "B"
 version = "1.1"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/with-pypi-repository.test
+++ b/tests/installation/fixtures/with-pypi-repository.test
@@ -4,7 +4,6 @@
 name = "attrs"
 version = "17.4.0"
 description = "Classes Without Boilerplate"
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@@ -21,7 +20,6 @@ tests = ["coverage", "hypothesis", "pympler", "pytest", "six", "zope.interface"]
 name = "colorama"
 version = "0.3.9"
 description = "Cross-platform colored terminal text."
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@@ -33,7 +31,6 @@ files = [
 name = "more-itertools"
 version = "4.1.0"
 description = "More routines for operating on iterables, beyond itertools"
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@@ -49,7 +46,6 @@ six = ">=1.0.0,<2.0.0"
 name = "pluggy"
 version = "0.6.0"
 description = "plugin and hook calling mechanisms for python"
-category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 files = [
@@ -60,7 +56,6 @@ files = [
 name = "py"
 version = "1.5.3"
 description = "library with cross-python path, ini-parsing, io, code, log facilities"
-category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 files = [
@@ -72,7 +67,6 @@ files = [
 name = "pytest"
 version = "3.5.0"
 description = "pytest: simple powerful testing with Python"
-category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 files = [
@@ -93,7 +87,6 @@ six = ">=1.10.0"
 name = "setuptools"
 version = "67.6.1"
 description = "Easily download, build, install, upgrade, and uninstall Python packages"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@@ -110,7 +103,6 @@ testing-integration = ["build[virtualenv]", "filelock (>=3.4.0)", "jaraco.envs (
 name = "six"
 version = "1.11.0"
 description = "Python 2 and 3 compatibility utilities"
-category = "dev"
 optional = false
 python-versions = "*"
 files = [

--- a/tests/installation/fixtures/with-python-versions.test
+++ b/tests/installation/fixtures/with-python-versions.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -11,7 +10,6 @@ files = []
 name = "B"
 version = "1.1"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -20,7 +18,6 @@ files = []
 name = "C"
 version = "1.2"
 description = ""
-category = "main"
 optional = false
 python-versions = "~2.7 || ^3.3"
 files = []

--- a/tests/installation/fixtures/with-same-version-url-dependencies.test
+++ b/tests/installation/fixtures/with-same-version-url-dependencies.test
@@ -2,7 +2,6 @@
 name = "demo"
 version = "0.1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 files = [
@@ -24,7 +23,6 @@ foo = ["cleo"]
 name = "demo"
 version = "0.1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 files = [
@@ -45,7 +43,6 @@ foo = ["cleo"]
 name = "pendulum"
 version = "1.4.4"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/with-sub-dependencies.test
+++ b/tests/installation/fixtures/with-sub-dependencies.test
@@ -2,7 +2,6 @@
 name = "A"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -14,7 +13,6 @@ D = "^1.0"
 name = "B"
 version = "1.1"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -26,7 +24,6 @@ C = "~1.2"
 name = "C"
 version = "1.2"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -35,7 +32,6 @@ files = []
 name = "D"
 version = "1.3"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/with-url-dependency.test
+++ b/tests/installation/fixtures/with-url-dependency.test
@@ -2,7 +2,6 @@
 name = "demo"
 version = "0.1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 files = [
@@ -24,7 +23,6 @@ foo = ["cleo"]
 name = "pendulum"
 version = "1.4.4"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/with-vcs-dependency-with-extras.test
+++ b/tests/installation/fixtures/with-vcs-dependency-with-extras.test
@@ -2,7 +2,6 @@
 name = "demo"
 version = "0.1.2"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -25,7 +24,6 @@ resolved_reference = "123456"
 name = "pendulum"
 version = "1.4.4"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -34,7 +32,6 @@ files = []
 name = "cleo"
 version = "1.0.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/with-vcs-dependency-without-ref.test
+++ b/tests/installation/fixtures/with-vcs-dependency-without-ref.test
@@ -2,7 +2,6 @@
 name = "demo"
 version = "0.1.2"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -21,7 +20,6 @@ resolved_reference = "123456"
 name = "pendulum"
 version = "1.4.4"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/installation/fixtures/with-wheel-dependency-no-requires-dist.test
+++ b/tests/installation/fixtures/with-wheel-dependency-no-requires-dist.test
@@ -2,7 +2,6 @@
 name = "demo"
 version = "0.1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"


--- a/tests/installation/test_installer.py
+++ b/tests/installation/test_installer.py
--- a/tests/installation/test_installer_old.py
+++ b/tests/installation/test_installer_old.py
--- a/tests/packages/test_locker.py
+++ b/tests/packages/test_locker.py
@@ -101,7 +101,6 @@ def test_lock_file_data_is_ordered(locker: Locker, root: ProjectPackage) -> None
 name = "A"
 version = "1.0.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = [
@@ -116,7 +115,6 @@ B = "^1.0"
 name = "A"
 version = "2.0.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = [
@@ -127,7 +125,6 @@ files = [
 name = "B"
 version = "1.2"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -136,7 +133,6 @@ files = []
 name = "git-package"
 version = "1.2.3"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -152,7 +148,6 @@ resolved_reference = "123456"
 name = "git-package-subdir"
 version = "1.2.3"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -169,7 +164,6 @@ subdirectory = "subdir"
 name = "url-package"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -182,7 +176,6 @@ url = "https://example.org/url-package-1.0-cp39-manylinux_2_17_x86_64.whl"
 name = "url-package"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -208,7 +201,6 @@ def test_locker_properly_loads_extras(locker: Locker) -> None:
 name = "cachecontrol"
 version = "0.12.5"
 description = "httplib2 caching for requests"
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 files = []
@@ -254,7 +246,6 @@ def test_locker_properly_loads_nested_extras(locker: Locker) -> None:
 name = "a"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -269,7 +260,6 @@ b = ["b[c] (>=1.0,<2.0)"]
 name = "b"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -284,7 +274,6 @@ c = ["c (>=1.0,<2.0)"]
 name = "c"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -335,7 +324,6 @@ def test_locker_properly_loads_extras_legacy(locker: Locker) -> None:
 name = "a"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -350,7 +338,6 @@ b = ["b (^1.0)"]
 name = "b"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -384,7 +371,6 @@ def test_locker_properly_loads_subdir(locker: Locker) -> None:
 name = "git-package-subdir"
 version = "1.2.3"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 develop = false
@@ -427,7 +413,6 @@ def test_locker_properly_assigns_metadata_files(locker: Locker) -> None:
 name = "demo"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 develop = false
@@ -436,7 +421,6 @@ develop = false
 name = "demo"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 develop = false
@@ -451,7 +435,6 @@ resolved_reference = "123456"
 name = "demo"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 develop = false
@@ -464,7 +447,6 @@ url = "./folder"
 name = "demo"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 develop = false
@@ -477,7 +459,6 @@ url = "./demo-1.0-cp39-win_amd64.whl"
 name = "demo"
 version = "1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 develop = false
@@ -548,7 +529,6 @@ def test_lock_packages_with_null_description(
 name = "A"
 version = "1.0.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -582,7 +562,6 @@ def test_lock_file_should_not_have_mixed_types(
 name = "A"
 version = "1.0.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -618,7 +597,6 @@ def test_reading_lock_file_should_raise_an_error_on_invalid_data(
 name = "A"
 version = "1.0.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -667,7 +645,6 @@ def test_locking_legacy_repository_package_should_include_source_section(
 name = "A"
 version = "1.0.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -790,7 +767,6 @@ def test_extras_dependencies_are_ordered(locker: Locker, root: ProjectPackage) -
 name = "A"
 version = "1.0.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -897,7 +873,6 @@ def test_locker_dumps_dependency_information_correctly(
 name = "A"
 version = "1.0.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -944,7 +919,6 @@ def test_locker_dumps_subdir(locker: Locker, root: ProjectPackage) -> None:
 name = "git-package-subdir"
 version = "1.2.3"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -993,7 +967,6 @@ def test_locker_dumps_dependency_extras_in_correct_order(
 name = "A"
 version = "1.0.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []
@@ -1021,7 +994,6 @@ def test_locked_repository_uses_root_dir_of_package(
 name = "lib-a"
 version = "0.1.0"
 description = ""
-category = "main"
 optional = false
 python-versions = "^2.7.9"
 develop = true
@@ -1162,7 +1134,6 @@ def test_lock_file_resolves_file_url_symlinks(root: ProjectPackage) -> None:
 name = "local-package"
 version = "1.2.3"
 description = ""
-category = "main"
 optional = false
 python-versions = "*"
 files = []

--- a/tests/puzzle/test_solver.py
+++ b/tests/puzzle/test_solver.py
@@ -356,7 +356,7 @@ def test_solver_sets_groups(

    transaction = solver.solve()

-    ops = check_solver_result(
+    _ = check_solver_result(
        transaction,
        [
            {"job": "install", "package": package_c},
@@ -365,10 +365,6 @@ def test_solver_sets_groups(
        ],
    )

-    assert ops[0].package.category == "dev"
-    assert ops[2].package.category == "dev"
-    assert ops[1].package.category == "main"
-

 def test_solver_respects_root_package_python_versions(
    solver: Solver, repo: Repository, package: ProjectPackage
@@ -1090,7 +1086,7 @@ def test_solver_with_dependency_in_both_main_and_dev_dependencies(

    transaction = solver.solve()

-    ops = check_solver_result(
+    _ = check_solver_result(
        transaction,
        [
            {"job": "install", "package": package_d},
@@ -1100,16 +1096,6 @@ def test_solver_with_dependency_in_both_main_and_dev_dependencies(
        ],
    )

-    d = ops[0].package
-    b = ops[1].package
-    c = ops[2].package
-    a = ops[3].package
-
-    assert d.category == "dev"
-    assert b.category == "main"
-    assert c.category == "dev"
-    assert a.category == "main"
-

 def test_solver_with_dependency_in_both_main_and_dev_dependencies_with_one_more_dependent(  # noqa: E501
    solver: Solver, repo: Repository, package: ProjectPackage
@@ -1147,7 +1133,7 @@ def test_solver_with_dependency_in_both_main_and_dev_dependencies_with_one_more_

    transaction = solver.solve()

-    ops = check_solver_result(
+    _ = check_solver_result(
        transaction,
        [
            {"job": "install", "package": package_b},
@@ -1158,18 +1144,6 @@ def test_solver_with_dependency_in_both_main_and_dev_dependencies_with_one_more_
        ],
    )

-    b = ops[0].package
-    d = ops[1].package
-    a = ops[2].package
-    c = ops[3].package
-    e = ops[4].package
-
-    assert b.category == "main"
-    assert d.category == "dev"
-    assert a.category == "main"
-    assert c.category == "dev"
-    assert e.category == "main"
-

 def test_solver_with_dependency_and_prerelease_sub_dependencies(
    solver: Solver, repo: Repository, package: ProjectPackage
@@ -1218,7 +1192,7 @@ def test_solver_circular_dependency(

    transaction = solver.solve()

-    ops = check_solver_result(
+    _ = check_solver_result(
        transaction,
        [
            {"job": "install", "package": package_c},
@@ -1227,8 +1201,6 @@ def test_solver_circular_dependency(
        ],
    )

-    assert ops[0].package.category == "main"
-

 def test_solver_circular_dependency_chain(
    solver: Solver, repo: Repository, package: ProjectPackage
@@ -1254,7 +1226,7 @@ def test_solver_circular_dependency_chain(

    transaction = solver.solve()

-    ops = check_solver_result(
+    _ = check_solver_result(
        transaction,
        [
            {"job": "install", "package": package_d},
@@ -1264,8 +1236,6 @@ def test_solver_circular_dependency_chain(
        ],
    )

-    assert ops[0].package.category == "main"
-

 def test_solver_dense_dependencies(
    solver: Solver, repo: Repository, package: ProjectPackage