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A subset of the distribution that can be excluded if unneeded/wanted
Features are created using these keyword arguments:
'description' -- a short, human readable description of the feature, to
be used in error messages, and option help messages.
'standard' -- if true, the feature is included by default if it is
available on the current system. Otherwise, the feature is only
included if requested via a command line '--with-X' option, or if
another included feature requires it. The default setting is 'False'.
'available' -- if true, the feature is available for installation on the
current system. The default setting is 'True'.
'optional' -- if true, the feature's inclusion can be controlled from the
command line, using the '--with-X' or '--without-X' options. If
false, the feature's inclusion status is determined automatically,
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requires it. The default setting is 'True'.
'require_features' -- a string or sequence of strings naming features
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empty list. May also contain 'Require' objects that should be
added/removed from the distribution.
'remove' -- a string or list of strings naming packages to be removed
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feature *is* included, this argument is ignored. This argument exists
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defining a 'tests' feature that removes all the 'tests' subpackages
provided by other features. The default for this argument is an empty
list. (Note: the named package(s) or modules must exist in the base
distribution when the 'setup()' function is initially called.)
other keywords -- any other keyword arguments are saved, and passed to
the distribution's 'include()' and 'exclude()' methods when the
feature is included or excluded, respectively. So, for example, you
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added or removed from the distribution as appropriate.
A feature must include at least one 'requires', 'remove', or other
keyword argument. Otherwise, it can't affect the distribution in any way.
Note also that you can subclass 'Feature' to create your own specialized
feature types that modify the distribution in other ways when included or
excluded. See the docstrings for the various methods here for more detail.
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