Calcsimple

gruntfutuk

Aug 15th, 2018

213

Never

Add comment

Not a member of Pastebin yet? Sign Up, it unlocks many cool features!

Python 1.97 KB | None | 0 0

raw download clone embed print report

''' simple console based calculator '''
import operator as op
OPERATORS = {
'**': op.pow,
'^': op.pow,
'*': op.mul,
'/': op.truediv,
'//': op.floordiv,
'+': op.add,
'-': op.sub,
'%': op.mod,
'<': op.lt,
'<=': op.le,
'==': op.eq,
'!=': op.ne,
'>=': op.ge,
'>': op.gt,
}
def get_num(msg):
''' promt for and return numeric input - reject responses that are not integer or float '''
while True:
response = input(msg)
value = None
if response:
try:
value = float(response)
value = int(response) # float worked, try int
except ValueError as e: # either float or int cast failed
pass
if value or value is 0: # if float worked, we will have a value
return value
print('integer or decimal input required. Please try again.')
print('\n\nWelcome to this simple calculator\n\n')
print('The following operators are understood:\n ')
print(' '.join(OPERATORS))
print('\nYou will be repeatedly asked to enter the operator you wish to use')
print('and the two operands to apply the operator to. To exit the programme')
print('simply press enter/return on its own when prompted for an operator.\n\n')
while True: # master loop, input another calculation
print()
while True: # valid operator input
operator = input('What operation (symbol) ? ')
if not operator or operator in OPERATORS:
break
print('Sorry. Not supported.')
if not operator:
break
num1 = get_num('enter first operand: ')
num2 = get_num('enter second operand: ')
try:
result = OPERATORS[operator](num1,num2)
except ValueError as e:
print(e)
except TypeError as e:
print(e)
except ZeroDivisionError as e:
print(e)
else:
print(f'{num1} {operator} {num2} = {result}')

Add Comment

Please, Sign In to add comment