Text Shift function in Python

Question

I\'m writing code so you can shift text two places along the alphabet: \'ab cd\' should become \'cd ef\'. I\'m using Python 2 and this is what I got so far:

Answer 1

Tried with Basic python. may useful for someone.

# Caesar cipher
import sys

text = input("Enter your message: ")

cipher = ''
try:
  number = int(input("Enter Number to shift the value : "))
except ValueError:
  print("Entered number should be integer. please re0enter the value")
  try:
    number = int(input("Enter Number to shift the value : "))
  except:
    print("Error occurred. please try again.")
    sys.exit(2)
  
for char in text:
    if not char.isalpha():
      flag = char
    elif char.isupper():
      code = ord(char) + number
      if 64 < code <= 90:
        flag = chr(code)
      elif code > 90:
        flag = chr((code - 90) + 64)
        
    elif char.islower():
      code = ord(char) + number
      if 96 < code <= 122:
        flag = chr(code)
      elif code > 122:
        flag = chr((code - 122) + 96)
    
    else:
      print("not supported value by ASCII")
    
    cipher += flag

print(cipher)