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?? __init__.py(4 KB)
?? __pycache__
?? cache.py(5.54 KB)
?? check.py(1.64 KB)
?? completion.py(3.01 KB)
?? configuration.py(9.13 KB)
?? debug.py(7.14 KB)
?? download.py(4.8 KB)
?? freeze.py(3.37 KB)
?? hash.py(1.8 KB)
?? help.py(1.24 KB)
?? install.py(28.05 KB)
?? list.py(11.05 KB)
?? search.py(5.62 KB)
?? show.py(6.83 KB)
?? uninstall.py(3.23 KB)
?? wheel.py(6.27 KB)

Editing: freeze.py

from __future__ import absolute_import

import sys

from pip._internal.cache import WheelCache
from pip._internal.cli import cmdoptions
from pip._internal.cli.base_command import Command
from pip._internal.cli.status_codes import SUCCESS
from pip._internal.models.format_control import FormatControl
from pip._internal.operations.freeze import freeze
from pip._internal.utils.compat import stdlib_pkgs
from pip._internal.utils.typing import MYPY_CHECK_RUNNING

DEV_PKGS = {'pip', 'setuptools', 'distribute', 'wheel'}

if MYPY_CHECK_RUNNING:
    from optparse import Values
    from typing import List

class FreezeCommand(Command):
    """
    Output installed packages in requirements format.

packages are listed in a case-insensitive sorted order.
    """

usage = """
      %prog [options]"""
    log_streams = ("ext://sys.stderr", "ext://sys.stderr")

def add_options(self):
        # type: () -> None
        self.cmd_opts.add_option(
            '-r', '--requirement',
            dest='requirements',
            action='append',
            default=[],
            metavar='file',
            help="Use the order in the given requirements file and its "
                 "comments when generating output. This option can be "
                 "used multiple times.")
        self.cmd_opts.add_option(
            '-f', '--find-links',
            dest='find_links',
            action='append',
            default=[],
            metavar='URL',
            help='URL for finding packages, which will be added to the '
                 'output.')
        self.cmd_opts.add_option(
            '-l', '--local',
            dest='local',
            action='store_true',
            default=False,
            help='If in a virtualenv that has global access, do not output '
                 'globally-installed packages.')
        self.cmd_opts.add_option(
            '--user',
            dest='user',
            action='store_true',
            default=False,
            help='Only output packages installed in user-site.')
        self.cmd_opts.add_option(cmdoptions.list_path())
        self.cmd_opts.add_option(
            '--all',
            dest='freeze_all',
            action='store_true',
            help='Do not skip these packages in the output:'
                 ' {}'.format(', '.join(DEV_PKGS)))
        self.cmd_opts.add_option(
            '--exclude-editable',
            dest='exclude_editable',
            action='store_true',
            help='Exclude editable package from output.')

self.parser.insert_option_group(0, self.cmd_opts)

def run(self, options, args):
        # type: (Values, List[str]) -> int
        format_control = FormatControl(set(), set())
        wheel_cache = WheelCache(options.cache_dir, format_control)
        skip = set(stdlib_pkgs)
        if not options.freeze_all:
            skip.update(DEV_PKGS)

cmdoptions.check_list_path_option(options)

freeze_kwargs = dict(
            requirement=options.requirements,
            find_links=options.find_links,
            local_only=options.local,
            user_only=options.user,
            paths=options.path,
            isolated=options.isolated_mode,
            wheel_cache=wheel_cache,
            skip=skip,
            exclude_editable=options.exclude_editable,
        )

for line in freeze(**freeze_kwargs):
            sys.stdout.write(line + '\n')
        return SUCCESS

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