Fix handling of in environment markers with commas

CHANGELOG.md

 # Change Log
 
+## [Unreleased]
+
+### Fixed
+
+- Fixed handling of `in` environment markers with commas.
+
+
 ## [0.10.1] - 2018-05-28
 
 ### Fixed

poetry/packages/__init__.py

@@ -111,7 +111,7 @@ def dependency_from_pep_508(name):
                     version += '.*'
                 elif op == 'in':
                     versions = []
-                    for v in version.split(' '):
+                    for v in re.split('[ ,]+', version):
                         split = v.split('.')
                         if len(split) in [1, 2]:
                             split.append('*')
@@ -141,7 +141,7 @@ def dependency_from_pep_508(name):
                     op = ''
                 elif op == 'in':
                     platforms = []
-                    for v in platform.split(' '):
+                    for v in re.split('[ ,]+', platform):
                         platforms.append(v)
 
                     if platforms:

tests/packages/test_main.py

@@ -110,6 +110,18 @@ def test_dependency_python_version_in():
     assert dep.python_versions == '3.3.* || 3.4.* || 3.5.*'
 
 
+def test_dependency_python_version_in_comma():
+    name = (
+        'requests (==2.18.0); '
+        'python_version in \'3.3, 3.4, 3.5\''
+    )
+    dep = dependency_from_pep_508(name)
+
+    assert dep.name == 'requests'
+    assert str(dep.constraint) == '2.18.0'
+    assert dep.python_versions == '3.3.* || 3.4.* || 3.5.*'
+
+
 def test_dependency_platform_in():
     name = (
         'requests (==2.18.0); '