On 09.03.15 10:19, Maciej Fijalkowski wrote:
Not all your examples are good.
* float(x) calls __float__ (not __int__)
* re.group requires __eq__ (and __hash__)
* I'm unsure about OSError
* the % thing at the very least works on pypy
Yes, all these examples are implementation defined and can differ
between CPython and PyPy. There is about a dozen of similar examples
only in C part of CPython. Most of them have in common is that the
behavior of the function depends on the argument type. For example in
case of re.group an argument is either integer index or string group
name. OSError constructor can produce OSError subtype if first argument
is known integer errno. float either convert a number to float or parse
a string (or bytes).
Python functions can be more lenient (if they allows ducktyping) or more
strict (if they explicitly check the type). They rarely call __index__
or __int__.
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