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Logging object for use in command-line script. Allows ranges of
levels, to avoid some redundancy of displayed information.
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Logs deprecation message which is log level WARN if the
``removal_version`` is > 1 minor release away and log level ERROR
otherwise.
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version 1.7, but will in 1.6 would have a removal_version of 1.7.
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shown, write out another '.'u .u i u u
%s%s%s%sN( u in_progress_hangingu Noneu sysu stdoutu writeu flushu last_messageu maxu lenu indentu in_progress( u selfu messageu padding( ( u /tmp/pip-zej_zi-build/pip/log.pyu
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>>> l = Logger()
>>> l.level_matches(3, 4)
False
>>> l.level_matches(3, 2)
True
>>> l.level_matches(slice(None, 3), 3)
False
>>> l.level_matches(slice(None, 3), 2)
True
>>> l.level_matches(slice(1, 3), 1)
True
>>> l.level_matches(slice(2, 3), 1)
False
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