58 lines
1.2 KiB
Python
58 lines
1.2 KiB
Python
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"""
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Compatibility tools for differences between Python 2 and 3
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"""
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asunicode = lambda x, _: str(x) # noqa:E731
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__all__ = [
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"asunicode",
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"asstr",
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"asbytes",
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"lmap",
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"lzip",
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"lrange",
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"lfilter",
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"with_metaclass",
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]
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def asbytes(s):
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if isinstance(s, bytes):
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return s
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return s.encode("latin1")
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def asstr(s):
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if isinstance(s, str):
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return s
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return s.decode("latin1")
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# list-producing versions of the major Python iterating functions
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def lrange(*args, **kwargs):
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return list(range(*args, **kwargs))
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def lzip(*args, **kwargs):
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return list(zip(*args, **kwargs))
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def lmap(*args, **kwargs):
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return list(map(*args, **kwargs))
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def lfilter(*args, **kwargs):
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return list(filter(*args, **kwargs))
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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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