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Utility functions for simple, timestamp-based dependency of files
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Tells
if the target is newer than the source.

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than
    'target', or if 'source' exists and
'target' doesn't.

    Return false if both exist and 'target' is the same age or
younger
    than 'source'. Raise DistutilsFileError if 'source'
does not exist.

    Note that this test is not very accurate: files created in the same
second
    will have the same "age".
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two filename lists in parallel, testing if each source is newer
    than its corresponding target.  Return a pair of lists (sources,
    targets) where source is newer than target, according to the semantics
    of 'newer()'.
    s+'sources' and 'targets' must be same
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true if 'target' is out-of-date with respect to any file
    listed in 'sources'.

    In other words, if 'target' exists and is newer
    than every file in 'sources', return false; otherwise return
true.
    'missing' controls what we do when a source file is missing;
the
    default ("error") is to blow up with an OSError from inside
'stat()';
    if it is "ignore", we silently drop any missing source files;
if it is
    "newer", any missing source files make us assume that
'target' is
    out-of-date (this is handy in "dry-run" mode: it'll make
you pretend to
    carry out commands that wouldn't work because inputs are missing,
but
    that doesn't matter because you're not actually going to run
the
    commands).
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