In Python 3 – Yes, you can specify *
in the argument list.
From docs:
Parameters after “*” or “*identifier” are keyword-only parameters and
may only be passed used keyword arguments.
>>> def foo(pos, *, forcenamed):
... print(pos, forcenamed)
...
>>> foo(pos=10, forcenamed=20)
10 20
>>> foo(10, forcenamed=20)
10 20
>>> foo(10, 20)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: foo() takes exactly 1 positional argument (2 given)
This can also be combined with **kwargs
:
def foo(pos, *, forcenamed, **kwargs):
To complete example:
def foo(pos, *, forcenamed ):
print(pos, forcenamed)
foo(pos=10, forcenamed=20)
foo(10, forcenamed=20)
# basically you always have to give the value!
foo(10)
output:
Traceback (most recent call last):
File "/Users/brando/anaconda3/envs/metalearning/lib/python3.9/site-packages/IPython/core/interactiveshell.py", line 3444, in run_code
exec(code_obj, self.user_global_ns, self.user_ns)
File "<ipython-input-12-ab74191b3e9e>", line 7, in <module>
foo(10)
TypeError: foo() missing 1 required keyword-only argument: 'forcenamed'
So you are forced to always give the value. If you don’t call it you don’t have to do anything else named argument forced.