Python File Encryption

Question

I need to encrypt a file with a key phrase for part of an assessment. I am doing mine in python and have run into a problem. It is written using python 2.7.4

My code is as follows:

import array

def encrypter(intext, shift, modder):
    plain2 = list(intext)
    plain = array.fromlist(plain2)
    out = ''
    j = 0
    key = list(shift)
    for c in plain:
        if mod > 0:
            x = chr((ord(c) + ord(key[(j % (len(plain) - 1)) % len(key)]) - 48) % 58 + 48)
        if mod < 0:
            x = chr((ord(c) - ord(key[(j % (len(plain) - 1)) % len(key)]) - 48) % 58 + 48)
        out += x
        j += 1
    return out
sel = raw_input("Encrypt (e)/ Decrypt (d)")
if sel == 'e':
    mod = 1
    intext = open(raw_input("what is your file"),'r')
    shift = raw_input("what is your first password")
    encrypter(intext, shift, mod)

else:
    pass

My problem is that whenever I run this with a file called text1.txt I get this error:

Traceback (most recent call last):
  File "D:/Programming/Computing GCSE/Tasks/task3.py", line 22, in <module>
    encrypter(intext, shift, mod)
  File "D:/Programming/Computing GCSE/Tasks/task3.py", line 5, in encrypter
    plain = array.fromlist(plain2)
AttributeError: 'module' object has no attribute 'fromlist'

Can anyone suggest a change in my code? I need this relatively quickly as my assessment is in an hour or so!

If this work is important you needed to start it sooner, before it became urgent. It's urgent for you now, not for us. — Open AI - Opting Out
– Open AI - Opting Out, Commented May 7, 2015 at 16:02

Benjamin Peterson · Accepted Answer · 2015-05-07 15:26:22Z

2

It's not clear why you need the array module at all. Won't something like this work?

def encrypter(intext, shift, modder):
    plain = intext
    out = ''
    j = 0
    key = shift
    for c in plain:
        if mod > 0:
            x = chr((ord(c) + ord(key[(j % (len(plain) - 1)) % len(key)]) - 48) % 58 + 48)
        if mod < 0:
            x = chr((ord(c) - ord(key[(j % (len(plain) - 1)) % len(key)]) - 48) % 58 + 48)
        out += x
        j += 1
    return out

edited May 7, 2015 at 15:26

answered May 7, 2015 at 15:12

Benjamin Peterson

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4 Comments

Alexander Haynes Over a year ago

#Traceback (most recent call last): File "D:/Programming/Computing GCSE/Tasks/task3.py", line 22, in <module> encrypter(intext, shift, mod) File "D:/Programming/Computing GCSE/Tasks/task3.py", line 5, in encrypter plain = array.array.fromlist(plain2) TypeError: descriptor 'fromlist' requires a 'array.array' object but received a 'list'

Benjamin Peterson Over a year ago

You probably don't even need the array module. See my edit.

Alexander Haynes Over a year ago

when I do that I get this error Traceback (most recent call last): File "D:/Programming/Computing GCSE/Tasks/task3.py", line 22, in <module> encrypter(intext, shift, mod) File "D:/Programming/Computing GCSE/Tasks/task3.py", line 10, in encrypter x = chr((ord(c) + ord(key[(j % (len(plain) - 1)) % len(key)]) - 48) % 58 + 48) TypeError: ord() expected a character, but string of length 15 found

Benjamin Peterson Over a year ago

Write intext = open(raw_input("what is your file"),'r').read().

onemouth · Accepted Answer · 2015-05-07 15:35:04Z

1

import array class from module

from array import array
plain = array('b', plain2)

edited May 7, 2015 at 15:35

answered May 7, 2015 at 15:15

onemouth

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1 Comment

Alexander Haynes Over a year ago

Traceback (most recent call last): File "D:/Programming/Computing GCSE/Tasks/task3.py", line 22, in <module> encrypter(intext, shift, mod) File "D:/Programming/Computing GCSE/Tasks/task3.py", line 5, in encrypter plain = array.fromlist(plain2) TypeError: descriptor 'fromlist' requires a 'array.array' object but received a 'list'

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