what is meant by this error "SyntaxError: positional argument follows keyword argument" ?

Answer 1

When calling a function, you must call positional arguments before keyword arguments. So if you have

def func(x, y):
...

you can't call the function using

func(y=0, x)

y=0 would be a keyword argument here, and x would be a positional argument.

func(x, y=0)

would be fine.