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annotate env/lib/python3.7/site-packages/future/builtins/disabled.py @ 4:79f47841a781 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:47:39 -0400
parents 26e78fe6e8c4
children
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1 """
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2 This disables builtin functions (and one exception class) which are
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3 removed from Python 3.3.
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4
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5 This module is designed to be used like this::
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6
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7 from future.builtins.disabled import *
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8
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9 This disables the following obsolete Py2 builtin functions::
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11 apply, cmp, coerce, execfile, file, input, long,
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12 raw_input, reduce, reload, unicode, xrange
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13
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14 We don't hack __builtin__, which is very fragile because it contaminates
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15 imported modules too. Instead, we just create new functions with
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16 the same names as the obsolete builtins from Python 2 which raise
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17 NameError exceptions when called.
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18
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19 Note that both ``input()`` and ``raw_input()`` are among the disabled
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20 functions (in this module). Although ``input()`` exists as a builtin in
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21 Python 3, the Python 2 ``input()`` builtin is unsafe to use because it
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22 can lead to shell injection. Therefore we shadow it by default upon ``from
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23 future.builtins.disabled import *``, in case someone forgets to import our
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24 replacement ``input()`` somehow and expects Python 3 semantics.
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25
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26 See the ``future.builtins.misc`` module for a working version of
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27 ``input`` with Python 3 semantics.
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28
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29 (Note that callable() is not among the functions disabled; this was
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30 reintroduced into Python 3.2.)
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31
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32 This exception class is also disabled:
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33
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34 StandardError
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35
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36 """
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37
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38 from __future__ import division, absolute_import, print_function
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39
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40 from future import utils
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42
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43 OBSOLETE_BUILTINS = ['apply', 'chr', 'cmp', 'coerce', 'execfile', 'file',
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44 'input', 'long', 'raw_input', 'reduce', 'reload',
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45 'unicode', 'xrange', 'StandardError']
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46
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47
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48 def disabled_function(name):
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49 '''
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50 Returns a function that cannot be called
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51 '''
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52 def disabled(*args, **kwargs):
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53 '''
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54 A function disabled by the ``future`` module. This function is
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55 no longer a builtin in Python 3.
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56 '''
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57 raise NameError('obsolete Python 2 builtin {0} is disabled'.format(name))
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58 return disabled
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59
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60
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61 if not utils.PY3:
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62 for fname in OBSOLETE_BUILTINS:
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63 locals()[fname] = disabled_function(fname)
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64 __all__ = OBSOLETE_BUILTINS
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65 else:
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66 __all__ = []