How to fix this weird error in my program?

Question

So I write a calculator then I tried to write a shorter version and there is one part of the code isn’t working as I need:

import os
while True:
  cont = input('Do you want to continue? (y for yes or n for no)n')
  os.system('clear') if os.name == 'posix' else os.system('cls') if cont == 'Y' or cont == 'y' else break if cont == 'N' or cont == 'n' else print('That's not y or n!')

And this is the longer version:

import os
while True:
  cont = input('Do you want to continue? (y or n)n')
  if cont == 'Y' or cont == 'y':
    if os.name == 'posix':
      os.system('clear')
    else:
      os.system('cls')
  elif cont == 'N' or cont == 'n':
    break
  else:
    print('That's not y or n!')

Sorry for not commenting anything!

I can’t do anything to the break at there because I’ve put the code into a while True: loop. I tried put in the i = 1 then change the while True: to while i = 1: and changed the break to i = 0 but it gives even more errors.

Asked By: Alexander

||

Source

Answer 1

In order to add break, there should be a loop (like for or while). If you want to exit from the program if user input ‘n’ or ‘N’, you can do something like this.

elif cont == 'N' or cont == 'n':
    exit

Since there is no loop to break, you can simply remove this elif snippet and handle not inserting ‘n’ or ‘N’ or ‘y’ or ‘Y’ like this.

elif cont != 'N' or cont != 'n':
    print("That's not 'n' or 'y'")

Answered By: Rashmi Shehana

Answer 2

You could easily shrink down your your code and keep it readable:

import os
cont = input('Do you want to continue? (y or n)n').lower()
if cont == 'y':
    cmd = "clear" if os.name == 'posix' else "cls"
    os.system(cmd)
elif cont not in ('n', 'y'):
    print('That's not y or n!')
else: # if needed
    break

Answered By: Maurice Meyer

How to fix this weird error in my program?

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