a simple calculator

[Solstice]

A simple calculator, for simple calculations.

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print("simple calculator by Solstice") print("I-----I") print("I00000I") print("I-----I") print("I1 2 3I") print("I4 5 6I") print("I7 8 9I") print("I-----I") print("        ") print("when the program asks for +- x : type restart to make some space") f=1 while f==1:     c=input("+/-/x/:?")     if c=="+":         x=input("first number ")         y=input("number to add ")         z=int(x)+int(y)         print(z)         input("results(Enter to continue)")     if c=="-":         x=input("first number ")         y=input("minus which number? ")         z=int(x)-int(y)         print(z)         input("results(Enter to continue)")     if c=="x":         x=input("first number ")         y=input("times what? ")         z=int(x)*int(y)         print(z)         input("results(Enter to continue)")     if c==":":         x=input("first number ")         y=input("divided by which number? ")         z=int(x)/int(y)         print(z)         input("results(Enter to continue)")     if c=="restart":         print(" ")         print(" ")         print(" ")         print(" ")         print(" ")         print(" ")         print(" ")         print(" ")         print(" ")         print(" ")         print(" ")         print(" ")         print(" ")         print(" ")         print("===========================================================")         print("I                      New calculation                    I")         print("===========================================================")

[Larz60+]

you can change all those print statements (empty lines)
to:
print('\n'* 14)

[Solstice]

Thank you ^^

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print("simple calculator by Solstice") print("I-----I") print("I00000I") print("I-----I") print("I1 2 3I") print("I4 5 6I") print("I7 8 9I") print("I-----I") print("        ") print("when the program asks for +- x : type restart to make some space") f=1 while f==1:     c=input("+/-/x/:?")     if c=="+":         x=input("first number ")         y=input("number to add ")         z=int(x)+int(y)         print(z)         input("results(Enter to continue)")     if c=="-":         x=input("first number ")         y=input("minus which number? ")         z=int(x)-int(y)         print(z)         input("results(Enter to continue)")     if c=="x":         x=input("first number ")         y=input("times what? ")         z=int(x)*int(y)         print(z)         input("results(Enter to continue)")     if c==":":         x=input("first number ")         y=input("divided by which number? ")         z=int(x)/int(y)         print(z)         input("results(Enter to continue)")     if c=="restart":         print('\n'* 14)         print("===========================================================")         print("I                      New calculation                    I")         print("===========================================================")

[Larz60+]

Here's another way to do this:

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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()

[Solstice]

looks good, have not learned how to code this way, but ill take a
look at it

[Mekire]

This is also a great opportunity to learn about switching on dictionaries instead of writing repetitive if/elif/else blocks:

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from operator import add, sub, mul, truediv     OPERATIONS = {"+" : add, "-" : sub, "*" : mul, "/" : truediv} OPERATOR_TEXT = {"+" : "Number to add? ", "-" : "Minus which number? ",                  "*" : "Times what? ", "/" : "Divided by which number? "}     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):         print("\n".join(self.form['header']))       def perform_op(self, operator):         x = int(input("First number: "))         y = int(input(OPERATOR_TEXT[operator]))         return OPERATIONS[operator](x, y)        def restart(self):         print('\n' * 14)         print("===========================================================")         print("I                      New calculation                    I")         print("===========================================================")        def calc(self):         self.print_header()         while True:             user_input = input("+,-,*,/? ")             if user_input == "restart":                 self.restart()             else:                 result = self.perform_op(user_input)                 print(result)             input("results(Enter to continue)")     if __name__ == '__main__':     Calculator()

[Solstice]

I partially understand the code, but I could need some more help.

Also, how is it possible to let the programm itself call self defined functions?
example()

[Larz60+]

Also, how is it possible to let the programm itself call self defined functions?

I'm not sure what you mean by self defined functions.
do you mean from within the class?

[Solstice]

I mean

def myfunc()

then you can call this function in the shell,

so if

def myfunc():
print("text")

it will print text in the shell when you type
myfunc()

can this be automated so it can be run in the terminal too?

[Larz60+]

within the class, it's called a method.
It requires the first argument to be self for example:

1 2	def myfunc(self):     print('text')

if external from the class,

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def myfunc():     return "I'm a function"   class myClass:     def __init__(self):         print(myfunc())   myClass()

You can run either Merkie's code, or the code that I supplied from the command line,
just save as a .py file (say 'MyClass.py') and run as any other python script:

1	python MyClass.py