Python-Programs/Calculator at master · maheshwar2611/Python-Programs · GitHub

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#https://www.facebook.com/baibhav.tripathy.5/posts/346793770081669
#Subscribed to Code House


# define a dictionary which has functions for the operations
operations = {
    '+' : lambda number_1, number_2: number_1 + number_2,
    '-' : lambda number_1, number_2: number_1 - number_2,
    '*' : lambda number_1, number_2: number_1 * number_2,
    '/' : lambda number_1, number_2: number_1 / number_2,
}

def input_number(prompt='enter a number: '):
    '''the user must enter a number'''
    try:
        return int(input(prompt))
    except ValueError:
        print('Not got a number')
        exit()

def calculation_error(*arguments):
    '''in case operator is not supported then inform the user'''
    print('You have not typed a valid operator, please run the program again.')


# driver code
operation = input('''
Please type in the math operation you would like to complete:
+ for addition
- for subtraction
* for multiplication
/ for division:
''') or None

number_1 = input_number('Enter your first number: ')
number_2 = input_number('Enter your second number: ')

# perform the calculation and store the result otherwise display thew error
result = operations.get(operation, calculation_error)(number_1, number_2)

print(f'{number_1} {operation} {number_2} = {result}')


# operation = input('''
# Please type in the math operation you would like to complete:
# + for addition
# - for subtraction
# * for multiplication
# / for division
# ''')

# number_1 = int(input('Enter your first number: '))
# number_2 = int(input('Enter your second number: '))

# if operation == '+':
#     print('{} + {} = '.format(number_1, number_2))
#     print(number_1 + number_2)

# elif operation == '-':
#     print('{} - {} = '.format(number_1, number_2))
#     print(number_1 - number_2)
#
# elif operation == '*':
#     print('{} * {} = '.format(number_1, number_2))
#     print(number_1 * number_2)

# elif operation == '/':
#     print('{} / {} = '.format(number_1, number_2))
#     print(number_1 / number_2)

# else:
#     print('You have not typed a valid operator, please run the program again.')