67 lines
2.1 KiB
Python
67 lines
2.1 KiB
Python
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"""
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This disables builtin functions (and one exception class) which are
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removed from Python 3.3.
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This module is designed to be used like this::
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from future.builtins.disabled import *
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This disables the following obsolete Py2 builtin functions::
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apply, cmp, coerce, execfile, file, input, long,
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raw_input, reduce, reload, unicode, xrange
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We don't hack __builtin__, which is very fragile because it contaminates
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imported modules too. Instead, we just create new functions with
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the same names as the obsolete builtins from Python 2 which raise
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NameError exceptions when called.
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Note that both ``input()`` and ``raw_input()`` are among the disabled
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functions (in this module). Although ``input()`` exists as a builtin in
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Python 3, the Python 2 ``input()`` builtin is unsafe to use because it
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can lead to shell injection. Therefore we shadow it by default upon ``from
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future.builtins.disabled import *``, in case someone forgets to import our
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replacement ``input()`` somehow and expects Python 3 semantics.
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See the ``future.builtins.misc`` module for a working version of
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``input`` with Python 3 semantics.
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(Note that callable() is not among the functions disabled; this was
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reintroduced into Python 3.2.)
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This exception class is also disabled:
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StandardError
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"""
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from __future__ import division, absolute_import, print_function
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from future import utils
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OBSOLETE_BUILTINS = ['apply', 'chr', 'cmp', 'coerce', 'execfile', 'file',
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'input', 'long', 'raw_input', 'reduce', 'reload',
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'unicode', 'xrange', 'StandardError']
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def disabled_function(name):
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'''
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Returns a function that cannot be called
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'''
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def disabled(*args, **kwargs):
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'''
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A function disabled by the ``future`` module. This function is
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no longer a builtin in Python 3.
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'''
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raise NameError('obsolete Python 2 builtin {0} is disabled'.format(name))
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return disabled
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if not utils.PY3:
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for fname in OBSOLETE_BUILTINS:
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locals()[fname] = disabled_function(fname)
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__all__ = OBSOLETE_BUILTINS
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else:
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__all__ = []
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