On 10/10/2017 10:37 AM, xieyuheng wrote:
2. what kind of functions does not have signature,
so that 'inspect.signature(f)' can be used for them ?
When .signature was added, it may not have been usable with *any*
C-coded function. About the same, a mechanism was added to make
signatures available with C-coded functions. Using the mechanism
requires recoding for each file. By now, many CPython functions have
been recoded.
section '29.12.3. Introspecting callables with the Signature object'
of the official documentation says :
> Some callables may not be introspectable in certain implementations of
Python.
So 'some' is a gradually shrinking set.
> For example, in CPython, some built-in functions defined in C
> provide no metadata about their arguments.
this is depends on implementation, so I ask for CPython.
--
Terry Jan Reedy
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