Call a function inside of a function inside of a class in Python

Question

So I'm having a problem with a larger piece of code where I'm getting an error message when I'm calling a function inside of another function that is inside of a class. In the code:

#Test program to solve problems. 

class Foo(object):
    def __init__(self, number):
        self.number = number

    def run(self):
        print "I will now square your number"
        print "Your number squared is: "
        print self.calculate()

    #This squares the number
        def calculate(self):
            return self.number**2


if __name__ == "__main__":
    test = Foo(input("Choose a number: "))
    print test.run()

I raise an "AttributeError: Foohas no attribute calculate", but I don't understand why? Am I calling calculate wrong to throw this error?

EDIT

So I know that if I change the indentation or calculate it works, but I wanna know is there anyway to get it working as it currently is with calculate indented in run or do python classes not work that way.

Answer 1

Updated after question edit:

Check out this link that shows how to make a "closure" https://stackoverflow.com/a/4831750/2459730

It's what you described as a function inside of a function.

def run(self):
    def calculate(self): # <------ Need to declare the function before calling
        return self.number**2

    print "I will now square your number"
    print "Your number squared is: "
    print self.calculate() # <---- Call after the function is declared

Before question edit: Your calculate function isn't indented properly.

def run(self):
    print "I will now square your number"
    print "Your number squared is: "
    print self.calculate()

#This squares the number
def calculate(self): # <----- Proper indentation
    return self.number**2 # <------ Proper indentation

The calculate function should have the same indentation level as the run function.

Answer 2

Indentation level is off. You are defining calculate INSIDE of the run function instead of in the class.

class Foo(object):
    def __init__(self, number):
        self.number = number

    def run(self):
        print "I will now square your number"
        print "Your number squared is: "
        print self.calculate()

    #This squares the number
    def calculate(self): #NOTE THE INDENTATION DIFFERENCE
        return self.number**2


if __name__ == "__main__":
    test = Foo(input("Choose a number: "))
    print test.run()