Add support for disjunctive python constraint

tests/installation/fixtures/with-optional-dependencies.test

@@ -17,7 +17,7 @@ python-versions = "*"
 platform = "*"
 
 [package.requirements]
-python = ">= 2.7.0.0 < 2.8.0.0"
+python = ">= 2.7.0.0, < 2.8.0.0"
 
 [[package]]
 name = "C"
@@ -32,7 +32,7 @@ platform = "*"
 D = "^1.2"
 
 [package.requirements]
-python = ">= 3.6.0.0 < 4.0.0.0"
+python = ">= 3.6.0.0, < 4.0.0.0"
 
 [[package]]
 name = "D"
@@ -44,7 +44,7 @@ python-versions = "*"
 platform = "*"
 
 [package.requirements]
-python = ">= 3.6.0.0 < 4.0.0.0"
+python = ">= 3.6.0.0, < 4.0.0.0"
 
 [metadata]
 python-versions = "~2.7 || ^3.4"

tests/semver/test_version_parser.py

@@ -63,6 +63,25 @@ def test_parse_constraints_wildcard(parser, input, min, max):
 @pytest.mark.parametrize(
     'input,min,max',
     [
+        ('!=v2.*', Constraint('<', '2.0.0.0'), Constraint('>=', '3.0.0.0')),
+        ('!=2.*.*', Constraint('<', '2.0.0.0'), Constraint('>=', '3.0.0.0')),
+        ('!=2.0.*', Constraint('<', '2.0.0.0'), Constraint('>=', '2.1.0.0')),
+        ('!=0.*', None, Constraint('>=', '1.0.0.0')),
+        ('!=0.*.*', None, Constraint('>=', '1.0.0.0')),
+    ]
+)
+def test_parse_constraints_negative_wildcard(parser, input, min, max):
+    if min:
+        expected = MultiConstraint((min, max), conjunctive=False)
+    else:
+        expected = max
+
+    assert str(parser.parse_constraints(input)) == str(expected)
+
+
+@pytest.mark.parametrize(
+    'input,min,max',
+    [
         ('~v1', Constraint('>=', '1.0.0.0'), Constraint('<', '2.0.0.0')),
         ('~1.0', Constraint('>=', '1.0.0.0'), Constraint('<', '1.1.0.0')),
         ('~1.0.0', Constraint('>=', '1.0.0.0'), Constraint('<', '1.1.0.0')),

tests/test_poetry.py

@@ -24,7 +24,7 @@ def test_poetry():
     assert package.keywords == ["packaging", "dependency", "poetry"]
 
     assert package.python_versions == '~2.7 || ^3.6'
-    assert str(package.python_constraint) == '>= 2.7.0.0 < 2.8.0.0 || >= 3.6.0.0 < 4.0.0.0'
+    assert str(package.python_constraint) == '>= 2.7.0.0, < 2.8.0.0 || >= 3.6.0.0, < 4.0.0.0'
 
     dependencies = package.requires
     cleo = dependencies[0]

tests/version/test_helpers.py

+from poetry.version.helpers import format_python_constraint
+from poetry.semver.version_parser import VersionParser
+
+
+def test_format_python_constraint():
+    parser = VersionParser()
+    constraint = parser.parse_constraints('~2.7 || ^3.6')
+
+    result = format_python_constraint(constraint)
+
+    assert result == '>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*'