CODEWITHSUNDEEP
pythonpython-2.7
Ryan Spaeth
Ryan Spaeth

Reputation: 21

Python IndexError: list assignment index out of range when listing txt file

So, I got this error 

    Traceback (most recent call last):
     File **, line 15, in <module>
        del a[del_line]
    IndexError: list assignment index out of range

I am trying to make a program that will generate password combinations, but delete them almost immediately while another program tests them, I just can't seem to get the right code... Here's my coding -

    from __future__ import print_function
    import itertools
    import sys
    from time import sleep 

    del_line = -1
    f1 = open("passfile.txt", "w")
    res = itertools.product("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789", repeat=8)
    for i in res:
       print(''.join(i), file=f1)
       sleep(.5)
       del_line += 1
       with open("passfile.txt","r") as textobj:
           a = list(textobj)
       del a[del_line]
       with open("textfile.txt","w") as textobj:
            for n in a:
                textobj.write(n)

Oh, I'm running python 2.7.11 btw

Upvotes: 2

Views: 252

Answers (2)

AndreyT
AndreyT

Reputation: 1499

Possibly, you should add 

f1.flush()

after 

print(''.join(i), file=f1)

Explanation: what exactly the python's file.flush() is doing?

(Updated)

from __future__ import print_function
import itertools
import sys
from time import sleep 

f1 = open("passfile.txt", "w")
# Note: count of permutations was reduced, because it takes very long time
res = itertools.product("ABCDEF", repeat=2)
for i in res:
   print(''.join(i), file=f1)
   f1.flush()
   with open("passfile.txt","r") as textobj:
       a = list(textobj)
   del a[-1]
   # Warning: textfile.txt will be overwritten each time
   with open("textfile.txt","w") as textobj:
        for n in a:
            textobj.write(n)

Upvotes: 0

Ricardo Umans
Ricardo Umans

Reputation: 35

Updated:

from __future__ import print_function
import itertools
import sys
from time import sleep 

f1 = open("passfile.txt", "w")
res = itertools.product("ABCD", repeat=2)
for i in res:
    text = ""
    for string in i: # makes the iterated i 'readable', i is a list with each letter as seperate entry, can be removed
        text += string
    print(text, file=f1)
    f1.flush()
    #sleep(.5)
    f2 = open("passfile.txt", "r")
    a = list(f2)[:-1]
    with open("textfile.txt","w") as textobj:
        for n in a:
            textobj.write(n)

Depending on whether you want the result of i stored as a list or as a string, you should use either AndreyT's code or mine. The trick itself was indeed in f1.flush(). More info on that can be found in this answer: what exactly the python's file.flush() is doing?

Upvotes: 1

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