Use sys.version_info instead of sys.version in packaging.

The contents of this attribute are an implementation detail, as
documented for #9442, so we should not parse it, to support non-CPython
VMs with distutils2 in the future.

Unfortunately, one use comes directly from PEP 345, so an edit will have
to be agreed before fixing the code (see comment in p7g.markers).

Other remaining uses are found in p7g.compiler and could be replaced by
the platform module (which also parses sys.version, but then it wouldn’t
be my fault :)

Lib/packaging/command/bdist_msi.py

@@ -7,9 +7,8 @@ import sys
 import os
 import msilib
 
-
-from sysconfig import get_python_version
 from shutil import rmtree
+from sysconfig import get_python_version
 from packaging.command.cmd import Command
 from packaging.version import NormalizedVersion
 from packaging.errors import PackagingOptionError
@@ -204,7 +203,7 @@ class bdist_msi(Command):
             target_version = self.target_version
             if not target_version:
                 assert self.skip_build, "Should have already checked this"
-                target_version = sys.version[0:3]
+                target_version = '%s.%s' % sys.version_info[:2]
             plat_specifier = ".%s-%s" % (self.plat_name, target_version)
             build = self.get_finalized_command('build')
             build.build_lib = os.path.join(build.build_base,

Lib/packaging/command/bdist_wininst.py

@@ -136,7 +136,7 @@ class bdist_wininst(Command):
             target_version = self.target_version
             if not target_version:
                 assert self.skip_build, "Should have already checked this"
-                target_version = sys.version[0:3]
+                target_version = '%s.%s' % sys.version_info[:2]
             plat_specifier = ".%s-%s" % (self.plat_name, target_version)
             build = self.get_finalized_command('build')
             build.build_lib = os.path.join(build.build_base,

Lib/packaging/command/build.py

@@ -82,8 +82,8 @@ class build(Command):
                 raise PackagingOptionError(
                             "--plat-name only supported on Windows (try "
                             "using './configure --help' on your platform)")
-
-        plat_specifier = ".%s-%s" % (self.plat_name, sys.version[0:3])
+        pyversion = '%s.%s' % sys.version_info[:2]
+        plat_specifier = ".%s-%s" % (self.plat_name, pyversion)
 
         # Make it so Python 2.x and Python 2.x with --with-pydebug don't
         # share the same build directories. Doing so confuses the build
@@ -116,7 +116,7 @@ class build(Command):
                                            'temp' + plat_specifier)
         if self.build_scripts is None:
             self.build_scripts = os.path.join(self.build_base,
-                                              'scripts-' + sys.version[0:3])
+                                              'scripts-' + pyversion)
 
         if self.executable is None:
             self.executable = os.path.normpath(sys.executable)

Lib/packaging/command/install_dist.py

@@ -242,7 +242,7 @@ class install_dist(Command):
         # $platbase in the other installation directories and not worry
         # about needing recursive variable expansion (shudder).
 
-        py_version = sys.version.split()[0]
+        py_version = '%s.%s' % sys.version_info[:2]
         prefix, exec_prefix, srcdir, projectbase = get_config_vars(
             'prefix', 'exec_prefix', 'srcdir', 'projectbase')
 

Lib/packaging/compiler/cygwinccompiler.py

@@ -56,6 +56,10 @@ from packaging.errors import PackagingExecError, CompileError, UnknownFileError
 from packaging.util import get_compiler_versions
 import sysconfig
 
+# TODO use platform instead of sys.version
+# (platform does unholy sys.version parsing too, but at least it gives other
+# VMs a chance to override the returned values)
+
 
 def get_msvcr():
     """Include the appropriate MSVC runtime library if Python was built

Lib/packaging/markers.py

 """Parser for the environment markers micro-language defined in PEP 345."""
 
+import os
 import sys
 import platform
-import os
-
-from tokenize import tokenize, NAME, OP, STRING, ENDMARKER, ENCODING
 from io import BytesIO
+from tokenize import tokenize, NAME, OP, STRING, ENDMARKER, ENCODING
 
 __all__ = ['interpret']
 
@@ -27,12 +26,15 @@ def _operate(operation, x, y):
 
 # restricted set of variables
 _VARS = {'sys.platform': sys.platform,
-         'python_version': sys.version[:3],
+         'python_version': '%s.%s' % sys.version_info[:2],
+         # FIXME parsing sys.platform is not reliable, but there is no other
+         # way to get e.g. 2.7.2+, and the PEP is defined with sys.version
          'python_full_version': sys.version.split(' ', 1)[0],
          'os.name': os.name,
          'platform.version': platform.version(),
          'platform.machine': platform.machine(),
-         'platform.python_implementation': platform.python_implementation()}
+         'platform.python_implementation': platform.python_implementation(),
+        }
 
 
 class _Operation:

Lib/packaging/pypi/simple.py

@@ -35,8 +35,8 @@ __all__ = ['Crawler', 'DEFAULT_SIMPLE_INDEX_URL']
 DEFAULT_SIMPLE_INDEX_URL = "http://a.pypi.python.org/simple/"
 DEFAULT_HOSTS = ("*",)
 SOCKET_TIMEOUT = 15
-USER_AGENT = "Python-urllib/%s packaging/%s" % (
-    sys.version[:3], packaging_version)
+USER_AGENT = "Python-urllib/%s.%s packaging/%s" % (
+    sys.version_info[0], sys.version_info[1], packaging_version)
 
 # -- Regexps -------------------------------------------------
 EGG_FRAGMENT = re.compile(r'^egg=([-A-Za-z0-9_.]+)$')

Lib/packaging/tests/test_command_build.py

@@ -26,7 +26,8 @@ class BuildTestCase(support.TempdirManager,
         # build_platlib is 'build/lib.platform-x.x[-pydebug]'
         # examples:
         #   build/lib.macosx-10.3-i386-2.7
-        plat_spec = '.%s-%s' % (cmd.plat_name, sys.version[0:3])
+        pyversion = '%s.%s' % sys.version_info[:2]
+        plat_spec = '.%s-%s' % (cmd.plat_name, pyversion)
         if hasattr(sys, 'gettotalrefcount'):
             self.assertTrue(cmd.build_platlib.endswith('-pydebug'))
             plat_spec += '-pydebug'
@@ -41,7 +42,7 @@ class BuildTestCase(support.TempdirManager,
         self.assertEqual(cmd.build_temp, wanted)
 
         # build_scripts is build/scripts-x.x
-        wanted = os.path.join(cmd.build_base, 'scripts-' + sys.version[0:3])
+        wanted = os.path.join(cmd.build_base, 'scripts-' + pyversion)
         self.assertEqual(cmd.build_scripts, wanted)
 
         # executable is os.path.normpath(sys.executable)