infering the number of args a function takes at runtime

[sniffer]

hi all,
i am a python newbie, in a project currently doing i need to find out
the number of arguments that a function takes at runtime.? Is this
possible ,if so how do i do this,i ve looked through the python
documentation but couldnt find anything.any help will be great


TIA

 

[Chris Rebert]

hi all,
i am a python newbie, in a project currently doing i need to find out
the number of arguments that a function takes at runtime.? Is this
possible ,if so how do i do this,i ve looked through the python
documentation but couldnt find anything.any help will be great

You want inspect.getargspec() or one of its friends in the `inspect`
module. See http://docs.python.org/library/inspect.html#inspect.getargspec

Cheers,
Chris

 

[James Mills]

You want inspect.getargspec() or one of its friends in the `inspect`
module. See http://docs.python.org/library/inspect.html#inspect.getargspec

Also, I have to ask: Why do you need to do this ?
Please show some code samples of what you're trying to achieve
and what the problem is ?

cheers
James

 

[sniffer]

hi all,
i am a python newbie, in a project currently doing i need to find out
the number of arguments that a function takes at runtime.? Is this
possible ,if so how do i do this,i ve looked through the python
documentation but couldnt find anything.any help will be great

TIA

Thanks guys , i think this should work for me.btw as enquired i am
working o a mvc thingie where in need to call functions in a
controller,and pass the arguments as recieved from the end user so i
need to make sure that the number of arguments passed from the front
end are correct or not in the context of the function being called

 

[Lie Ryan]

Thanks guys , i think this should work for me.btw as enquired i am
working o a mvc thingie where in need to call functions in a
controller,and pass the arguments as recieved from the end user so i
need to make sure that the number of arguments passed from the front end
are correct or not in the context of the function being called

In python, usually you'll just pass the them all and maybe catch errors.

def callback(*args, **kargs):
try:
return func(*args, **kargs)
except TypeError:
print('An error happened')