What do double parentheses mean in a function call? e.g. func(stuff)(stuff)?

Question

Original title:

"Help me understand this weird Python idiom? sys.stdout = codecs.getwriter(\'utf-8\')(sys.stdout)"

Answer 1

Calling the wrapper function with the double parentheses of python flexibility .

Example

1- funcWrapper

def funcwrapper(y):
    def abc(x):
        return x * y + 1
    return abc

result = funcwrapper(3)(5)
print(result)

2- funcWrapper

def xyz(z):
    return z + 1

def funcwrapper(y):
    def abc(x):
        return x * y + 1
    return abc

result = funcwrapper(3)(xyz(4))
print(result)