How to find out the arity of a method in Python

Question

I\'d like to find out the arity of a method in Python (the number of parameters that it receives). Right now I\'m doing this:

def arity(obj, method):
  retur         


        

Answer 1

Use a decorator to decorate methods e.g.

def arity(method):

  def _arity():
    return method.func_code.co_argcount - 1 # remove self

  method.arity = _arity

  return method

class Foo:
  @arity
  def bar(self, bla):
    pass

print Foo().bar.arity()

Now implement _arity function to calculate arg count based on your needs