Generate Alpha-Numeric Strings in Python (for BruteForce Attacks)

While I was coding the ‘Twitter Short Handles Finder‘ I needed an efficient Alpha-Numeric Strings generator in Python. I coded this from scratch:

def lastCase (lst):

for i in range(0, len(lst)):

if ( lst[i] != '_' ):

return False

return True

l = [''] * 4 #change size here if needed. I used 4 here

l[0] = '0'

index = 0

while ( not lastCase(l) ):

if ( ord(l[index]) > ord('_') ):

l[index] = '0'

index += 1

while( l[index] == '_' ):

l[index] = '0'

index += 1

if (l[index] == ''):

l[index] = '0'

#print or process generated string

print(''.join(l))

l[index] = chr(ord(l[index]) +1)

if ( ord(l[index]) > ord('9') and ord(l[index]) < ord('A') ):

l[index] = 'A'

elif ( ord(l[index]) > ord('Z') and ord(l[index]) < ord('_') ):

l[index] = '_'

index = 0

print (''.join(l))

There is also another version on StackOverFlow > here