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v1.0.0
docs/limitations.rst
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Jon Dufresne
Trim trailing white space throughout the project
10 сен 2018, 23:58
10 сен 2018, 23:58
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limitations of the ``future`` module and differences between Py2 and Py3 that are not (yet) handled =================================================================================================== The following attributes on functions in Python 3 are not provided in Python 2.7: __func__: see six.get_method_function() __self__: see six.get_method_self() __self__.__class__ Limitations of the ``futurize`` script -------------------------------------- The ``futurize`` script is not yet mature; like ``2to3``, on which it is based, it makes mistakes. Nevertheless, it should be useful for automatically performing a lot of the repetitive code-substitution tasks when porting from Py2 to Py2/3. Some new Python 3.3 features that cause SyntaxErrors on earlier versions are not currently handled by the ``futurize`` script. This includes: - ``yield ... from`` syntax for generators in Py3.3 - ``raise ... from`` syntax for exceptions. (This is simple to fix manually by creating a temporary variable.) Also: - Usage of ``file('myfile', 'w')`` as a synonym for ``open`` doesn't seem to be converted currently. - ``isinstance(var, basestring)`` should sometimes be converted to ``isinstance(var, str) or isinstance(var, bytes)``, or sometimes simply ``isinstance(var, str)``, depending on the context. Currently it is always converted to ``isinstance(var, str)``. - Caveats with bytes indexing!:: b'\x00'[0] != 0 b'\x01'[0] != 1 ``futurize`` does not yet wrap all byte-string literals in a ``bytes()`` call. This is on the to-do list. See :ref:`bytes-object` for more information. Notes ----- - Ensure you are using new-style classes on Py2. Py3 doesn't require inheritance from ``object`` for this, but Py2 does. ``pasteurize`` adds this back in automatically, but ensure you do this too when writing your classes, otherwise weird breakage when e.g. calling ``super()`` may occur.