a simple calculator

[Larz60+]

Here's another way to do this:

class Calculator:
    def __init__(self):
        self.form = {
            'header': ["simple calculator by Solstice", "I-----I", "I00000I", "I-----I", "I1 2 3I", "I4 5 6I",
                       "I7 8 9I", "I-----I", "", "when the program asks for +- x : type restart to make some space"]
        }
        self.calc()

    def print_header(self):
        for line in self.form['header']:
            print(line)

    def add(self):
        x = input("first number ")
        y = input("number to add ")
        return int(x) + int(y)

    def subtract(self):
        x = input("first number ")
        y = input("minus which number? ")
        return int(x) - int(y)

    def multiply(self):
        x = input("first number ")
        y = input("times what? ")
        return int(x) * int(y)

    def divide(self):
        x = input("first number ")
        y = input("divided by which number? ")
        return int(x) / int(y)

    def restart(self):
        print('\n' * 14)
        print("===========================================================")
        print("I                      New calculation                    I")
        print("===========================================================")

    def calc(self):
        self.print_header()
        while True:
            c = input("+/-/x//? ")
            if c == "+":
                print(self.add())
            elif c == "-":
                print(self.subtract())
            elif c == "x":
                print(self.multiply())
            elif c == "//":
                print(self.divide())
            elif c == "restart":
                self.restart()
            input("results(Enter to continue)")

if __name__ == '__main__':
    Calculator()