Function parameters with only an asterisk'*'

In Python3, there are only * parameters, as in the following function definition example.

`python`


>>> def foo(*, x):
	print(x)

The meaning of this usage is to force the argument to be passed in keyword format for the parameter following *, and if you pass the argument without the keyword, the following error will occur.


>>> foo(x=1)
1
>>> foo(1)
Traceback (most recent call last):
  File "<pyshell#14>", line 1, in <module>
    foo(1)
TypeError: foo() takes 0 positional arguments but 1 was given

Recommended Posts

Function parameters with only an asterisk'*'

Creating an authentication function

Note: The meaning of specifying only * (asterisk) as an argument in the Python function definition.

Kernel regression with Numpy only

Try function optimization with Optuna

Implement login function with django-allauth

Create an environment with virtualenv

Create an API with Django

Approximate sin function with TensorFlow

Try an autoencoder with Pytorch

Creating an egg with python