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