Forbid getting known key from kwargs

[orsinium]

Sometimes I see code like this:

def f(**kwargs):
  name = kwargs.pop('name')
  name = kwargs.get('name')
  name = kwargs['name'] 

For all 3 cases 'name' should be regular argument in function:

def f(*, name, **kwargs):
  ...

Related to #425

[sobolevn]

What if name is not provided? And we do not want to change the function's signature (we inherit something, use existing API)?

[orsinium]

What if name is not provided?

Every this case can be altered by signature:

# kwargs.get('name'):
def f(*, name=None):
  ...

# kwargs.pop('name') or kwargs['name']:
def f(*, name):
  ...

[sobolevn]

I will think about it after #425 is implemented

[sobolevn]

Closing, since we won't implement #425