I've recently noticed that when defining a function in python, you can use a single / in the argument list, to apparently no effect
>>> def f(a,b):
... return a
...
>>> f(1,2)
1
>>> def g(a,/,b):
... return a
...
>>> g(1,2)
1
>>> g.__code__.co_varnames
('a', 'b')
>>> def h(a,/,b,/,c):
File "<stdin>", line 1
def h(a,/,b,/,c):
^
SyntaxError: invalid syntax
As you can see, only one is accepted. It also seems like the fact that / was used in the original argument list isn't reflected in the final function.
What's its use/purpose?
