Refactor out a get_pip_version() function into misc.py.

Author: cjerdonek

src/pip/_internal/cli/main_parser.py

@@ -4,7 +4,6 @@
 import os
 import sys
 
-from pip import __version__
 from pip._internal.cli import cmdoptions
 from pip._internal.cli.parser import (
     ConfigOptionParser, UpdatingDefaultsHelpFormatter,
@@ -13,7 +12,7 @@
     commands_dict, get_similar_commands, get_summaries,
 )
 from pip._internal.exceptions import CommandError
-from pip._internal.utils.misc import get_prog
+from pip._internal.utils.misc import get_pip_version, get_prog
 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
 
 if MYPY_CHECK_RUNNING:
@@ -39,12 +38,7 @@ def create_main_parser():
     parser = ConfigOptionParser(**parser_kw)
     parser.disable_interspersed_args()
 
-    pip_pkg_dir = os.path.abspath(os.path.join(
-        os.path.dirname(__file__), "..", "..",
-    ))
-    parser.version = 'pip %s from %s (python %s)' % (
-        __version__, pip_pkg_dir, sys.version[:3],
-    )
+    parser.version = get_pip_version()
 
     # add the general options
     gen_opts = cmdoptions.make_option_group(cmdoptions.general_group, parser)

src/pip/_internal/utils/misc.py

@@ -28,6 +28,7 @@
 from pip._vendor.six.moves.urllib import request as urllib_request
 from pip._vendor.six.moves.urllib.parse import unquote as urllib_unquote
 
+from pip import __version__
 from pip._internal.exceptions import CommandError, InstallationError
 from pip._internal.locations import (
     running_under_virtualenv, site_packages, user_site, virtualenv_no_global,
@@ -104,6 +105,18 @@ def cast(typ, val):
     logger.debug('lzma module is not available')
 
 
+def get_pip_version():
+    # type: () -> str
+    pip_pkg_dir = os.path.join(os.path.dirname(__file__), "..", "..")
+    pip_pkg_dir = os.path.abspath(pip_pkg_dir)
+
+    return (
+        'pip {} from {} (python {})'.format(
+            __version__, pip_pkg_dir, sys.version[:3],
+        )
+    )
+
+
 def normalize_version_info(py_version_info):
     # type: (Optional[Tuple[int, ...]]) -> Optional[Tuple[int, int, int]]
     """