problem : test a type
polux
polux2001 at wanadoo.fr
Sun Aug 25 20:34:12 EDT 2002
Hans Nowak wrote:
> polux wrote:
>
>>
>> I'd like to test if an item in dir(math) is a function, but it doesn't
>> work :
>>
>>
>>
>>
>> >>> import math
>> >>> math.cos
>> <built-in function cos>
>> >>> math.cos==<built-in function cos>
>> SyntaxError: invalid syntax
>> >>> math.cos=='built-in function cos'
>> 0
>> >>>
>>
>> I've tried with "type", it doens't work better
>> the only way I found to do this is to use srt(math.item) and then test
>>
>> Can I do it differently ?
>
>
> You could use isinstance:
>
> >>> import types
> >>> def f(x): return 2*x
>
> >>> isinstance(f, types.FunctionType)
> 1
>
> ...but you're probably better off using the built-in callable()
> function, that matches not just functions, but also methods and other
> callable objects:
>
> >>> callable(f)
> 1
>
> HTH,
>
Thanks !
just what I needed
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