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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)
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?? show.py(6.83 KB)
?? uninstall.py(3.23 KB)
?? wheel.py(6.27 KB)

Editing: download.py

from __future__ import absolute_import

import logging
import os

from pip._internal.cli import cmdoptions
from pip._internal.cli.cmdoptions import make_target_python
from pip._internal.cli.req_command import RequirementCommand, with_cleanup
from pip._internal.cli.status_codes import SUCCESS
from pip._internal.req.req_tracker import get_requirement_tracker
from pip._internal.utils.misc import ensure_dir, normalize_path, write_output
from pip._internal.utils.temp_dir import TempDirectory
from pip._internal.utils.typing import MYPY_CHECK_RUNNING

if MYPY_CHECK_RUNNING:
    from optparse import Values
    from typing import List

logger = logging.getLogger(__name__)

class DownloadCommand(RequirementCommand):
    """
    Download packages from:

- PyPI (and other indexes) using requirement specifiers.
    - VCS project urls.
    - Local project directories.
    - Local or remote source archives.

pip also supports downloading from "requirements files", which provide
    an easy way to specify a whole environment to be downloaded.
    """

usage = """
      %prog [options] <requirement specifier> [package-index-options] ...
      %prog [options] -r <requirements file> [package-index-options] ...
      %prog [options] <vcs project url> ...
      %prog [options] <local project path> ...
      %prog [options] <archive url/path> ..."""

def add_options(self):
        # type: () -> None
        self.cmd_opts.add_option(cmdoptions.constraints())
        self.cmd_opts.add_option(cmdoptions.requirements())
        self.cmd_opts.add_option(cmdoptions.build_dir())
        self.cmd_opts.add_option(cmdoptions.no_deps())
        self.cmd_opts.add_option(cmdoptions.global_options())
        self.cmd_opts.add_option(cmdoptions.no_binary())
        self.cmd_opts.add_option(cmdoptions.only_binary())
        self.cmd_opts.add_option(cmdoptions.prefer_binary())
        self.cmd_opts.add_option(cmdoptions.src())
        self.cmd_opts.add_option(cmdoptions.pre())
        self.cmd_opts.add_option(cmdoptions.require_hashes())
        self.cmd_opts.add_option(cmdoptions.progress_bar())
        self.cmd_opts.add_option(cmdoptions.no_build_isolation())
        self.cmd_opts.add_option(cmdoptions.use_pep517())
        self.cmd_opts.add_option(cmdoptions.no_use_pep517())

self.cmd_opts.add_option(
            '-d', '--dest', '--destination-dir', '--destination-directory',
            dest='download_dir',
            metavar='dir',
            default=os.curdir,
            help=("Download packages into <dir>."),
        )

cmdoptions.add_target_python_options(self.cmd_opts)

index_opts = cmdoptions.make_option_group(
            cmdoptions.index_group,
            self.parser,
        )

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

@with_cleanup
    def run(self, options, args):
        # type: (Values, List[str]) -> int

options.ignore_installed = True
        # editable doesn't really make sense for `pip download`, but the bowels
        # of the RequirementSet code require that property.
        options.editables = []

cmdoptions.check_dist_restriction(options)

options.download_dir = normalize_path(options.download_dir)

ensure_dir(options.download_dir)

session = self.get_default_session(options)

target_python = make_target_python(options)
        finder = self._build_package_finder(
            options=options,
            session=session,
            target_python=target_python,
        )
        build_delete = (not (options.no_clean or options.build_dir))

req_tracker = self.enter_context(get_requirement_tracker())

directory = TempDirectory(
            options.build_dir,
            delete=build_delete,
            kind="download",
            globally_managed=True,
        )

reqs = self.get_requirements(args, options, finder, session)

preparer = self.make_requirement_preparer(
            temp_build_dir=directory,
            options=options,
            req_tracker=req_tracker,
            session=session,
            finder=finder,
            download_dir=options.download_dir,
            use_user_site=False,
        )

resolver = self.make_resolver(
            preparer=preparer,
            finder=finder,
            options=options,
            py_version_info=options.python_version,
        )

self.trace_basic_info(finder)

requirement_set = resolver.resolve(
            reqs, check_supported_wheels=True
        )

downloaded = ' '.join([req.name  # type: ignore
                               for req in requirement_set.requirements.values()
                               if req.successfully_downloaded])
        if downloaded:
            write_output('Successfully downloaded %s', downloaded)

return SUCCESS

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