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The dependency resolution in pip is performed as follows:
for top-level requirements:
a. only one spec allowed per project, regardless of conflicts or not.
otherwise a "double requirement" exception is raised
b. they override sub-dependency requirements.
for sub-dependencies
a. "first found, wins" (where the order is breadth first)
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Check whether the given Python version is compatible with a distribution's
"Requires-Python" value.
:param version_info: A 3-tuple of ints representing the Python
major-minor-micro version to check.
:param ignore_requires_python: Whether to ignore the "Requires-Python"
value if the given Python version isn't compatible.
:raises UnsupportedPythonVersion: When the given Python version isn't
compatible.
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| j | � qe Xqe W| r� | � n | S( s� Resolve what operations need to be done
As a side-effect of this method, the packages (and their dependencies)
are downloaded, unpacked and prepared for installation. This
preparation is done by ``pip.operations.prepare``.
Once PyPI has static dependency metadata available, it would be
possible to move the preparation to become a step separated from
dependency resolution.
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Set a requirement to be installed.
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r� q� Xn | j | � d S( s Check if req_to_install should be skipped.
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or reinstall it, taking into account all the relevant user options.
After calling this req_to_install will only have satisfied_by set to
None if the req_to_install is to be upgraded/reinstalled etc. Any
other value will be a dist recording the current thing installed that
satisfies the requirement.
Note that for vcs urls and the like we can't assess skipping in this
routine - we simply identify that we need to pull the thing down,
then later on it is pulled down and introspected to assess upgrade/
reinstalls etc.
:return: A text reason for why it was skipped, or None.
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c C s{ | j | � } | j j | | � } | s. d S| j } | j rw | j pL d } d j d | d | � } t j | � n | S( Ns <none given>uq The candidate selected for download or install is a yanked version: {candidate}
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installed and not needed to be upgraded based on the return value of
_is_upgrade_allowed().
If preparer.require_hashes is True, don't use the wheel cache, because
cached wheels, always built locally, have different hashes than the
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sx Prepare a single requirements file.
:return: A list of additional InstallRequirements to also install.
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c sO g � t � � � � � � f d � � x! | j j � D] } � | � q7 W� S( s� Create the installation order.
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and make no other guarantees.
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