cls_calculator

'''



'''
from collections import OrderedDict

class BinaryCalculationOperation: 
    def __init__(self, op):
        self.op = op
        
    def go(self):
        x = self._prompt("First Number")  #One underscore for private variable or private function
        y = self._prompt("Second Number")
        print(self.op(x,y))
    
    def _prompt(self, prompt):
        while True:
            try:
                return float(input(prompt))
            except ValueError:
                print("Make sure to enter a number .....")
                
                
                
                
def get_operation(operations):
    while True:
        op_name = input("What would you like to do? " +
                        '/'.join(operations.keys())  + ' ').title()
                        
        try:
            return operations[op_name]
        except KeyError:
            print("That was not an option")
            
operations = OrderedDict([
    ('Multiply', BinaryCalculationOperation(lambda x, y: x * y)),
    ('Divide', BinaryCalculationOperation(lambda x, y: x / y)),
    ('Add', BinaryCalculationOperation(lambda x, y: x + y)),
    ('Subtract', BinaryCalculationOperation(lambda x, y: x - y)),    
])


get_operation(operations).go()