IndexError in python list

Question

Trying to write a python code to encrypt a string.

Encrypts the string and output is an encrypted string.

print "Enter the string "
a=raw_input()
b=len(a)+1
i=0
e=''


while i<b:
  c=''
  if i % 3 == 0:
     c+=a[i]
     e+=chr(ord(c)+5)
     del c
  elif i%3==1:
     c+=a[i]
     e+=chr(ord(c)+2)
     del c
  elif i%3==2:
     c+=a[i]
     e+=chr(ord(c)+6)
     del c     
  i=i+1

print e

But when on running this script, error comes.

c+=a[i]
IndexError: string index out of range

Here's a hint: give your identifiers meaningful names. Even with this short program, it's much more difficult than it should be to follow what is happening to what, and what each thing represents. Please read the Python Style Guide for more tips on improving your coding style. — MattDMo
– MattDMo, Commented May 12, 2016 at 17:14

dnit13 · Accepted Answer · 2016-05-12 16:26:54Z

1

Problem is when i becomes equal to len(a), then your a[i] will produce IndexError.

There can be a lot of other improvements other than this, like you are always executing c+=a[i] irrespective of the conditions and many more which you should try to figure out yourself.

answered May 12, 2016 at 16:26

dnit13

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