about 'setattr(o, name, value)' and 'inspect.signature(f)'
Terry Reedy
tjreedy at udel.edu
Tue Oct 10 12:06:52 EDT 2017
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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