-
Install decorator module:
$ pip install decorator
-
Adapt definition of
args_as_ints()
:import decorator @decorator.decorator def args_as_ints(f, *args, **kwargs): args = [int(x) for x in args] kwargs = dict((k, int(v)) for k, v in kwargs.items()) return f(*args, **kwargs) @args_as_ints def funny_function(x, y, z=3): """Computes x*y + 2*z""" return x*y + 2*z print funny_function("3", 4.0, z="5") # 22 help(funny_function) # Help on function funny_function in module __main__: # # funny_function(x, y, z=3) # Computes x*y + 2*z
Python 3.4+
functools.wraps()
from stdlib preserves signatures since Python 3.4:
import functools
def args_as_ints(func):
@functools.wraps(func)
def wrapper(*args, **kwargs):
args = [int(x) for x in args]
kwargs = dict((k, int(v)) for k, v in kwargs.items())
return func(*args, **kwargs)
return wrapper
@args_as_ints
def funny_function(x, y, z=3):
"""Computes x*y + 2*z"""
return x*y + 2*z
print(funny_function("3", 4.0, z="5"))
# 22
help(funny_function)
# Help on function funny_function in module __main__:
#
# funny_function(x, y, z=3)
# Computes x*y + 2*z
functools.wraps()
is available at least since Python 2.5 but it does not preserve the signature there:
help(funny_function)
# Help on function funny_function in module __main__:
#
# funny_function(*args, **kwargs)
# Computes x*y + 2*z
Notice: *args, **kwargs
instead of x, y, z=3
.