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98 lines
2.9 KiB
Python
98 lines
2.9 KiB
Python
# Copyright (c) 2010-2017 Benjamin Peterson
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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import itertools
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import sys
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PY2 = sys.version_info[0] == 2
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PY3 = sys.version_info[0] == 3
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if PY2:
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string_classes = basestring
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else:
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string_classes = (str, bytes)
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if PY2:
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int_classes = (int, long)
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else:
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int_classes = int
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def with_metaclass(meta, *bases):
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"""Create a base class with a metaclass."""
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# This requires a bit of explanation: the basic idea is to make a dummy
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# metaclass for one level of class instantiation that replaces itself with
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# the actual metaclass.
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class metaclass(meta):
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def __new__(cls, name, this_bases, d):
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return meta(name, bases, d)
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return type.__new__(metaclass, 'temporary_class', (), {})
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# A portable way of referring to the generator version of map
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# in both Python 2 and Python 3.
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# TODO: Move this into an appropriate utility library.
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if hasattr(itertools, 'imap'):
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imap = itertools.imap
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else:
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imap = map
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if PY3:
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import builtins
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exec_ = getattr(builtins, "exec")
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else:
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def exec_(_code_, _globs_=None, _locs_=None):
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"""Execute code in a namespace."""
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if _globs_ is None:
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frame = sys._getframe(1)
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_globs_ = frame.f_globals
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if _locs_ is None:
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_locs_ = frame.f_locals
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del frame
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elif _locs_ is None:
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_locs_ = _globs_
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exec("""exec _code_ in _globs_, _locs_""")
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if sys.version_info[:2] == (3, 2):
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exec_("""def raise_from(value, from_value):
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try:
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if from_value is None:
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raise value
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raise value from from_value
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finally:
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value = None
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""")
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elif sys.version_info[:2] > (3, 2):
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exec_("""def raise_from(value, from_value):
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try:
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raise value from from_value
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finally:
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value = None
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""")
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else:
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def raise_from(value, from_value):
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raise value
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