#!/usr/bin/env python
# Generate random passwords of length up to 16. Use upper and
# lower case letters, digits, and punctuation marks. May run
# interactively or with command line options.
import sys
import getopt
from random import randint
VERSION= "1.0.0"
HELP= ["-l [length] (1-16) -- The length of password generated",
"-p [--punct] -- Use punctuation",
"-h [--help] -- show the command line help; exit",
"-v [--version] -- show the version of app; exit"]
LENGTH_ERR= ["Password must be between 1 and 16 characters in length",
"Entering interactive mode..."]
# Functions
def WriteOut(Msg) :
'''Prints out multi-line messages'''
for Line in Msg :
print("\n{0}".format(Line))
pass
################################################################################
def Options(argv) :
'''Parse command line options, return values as needed'''
Length= 0
PMark= "n"
# Put this in a try...except block since getopt barfs on empty command lines
# catch and discard the exception. Send back 0 as a result, set up for
# interactive session
try :
Opts,Args= getopt.getopt(argv, "l:phv", ["length=", "punct", "help", "version"])
except getopt.GetoptError as err : return Length,PMark
for opts,args in Opts :
if opts in ("-l", "--length") : Length= int(args)
elif opts in ("-p", "--punct") : PMark= "y"
elif opts in ("-h", "--help") :
WriteOut(HELP)
sys.exit(0)
elif opts in ("-v", "--version") :
print("Version: {0}".format(VERSION))
sys.exit(0)
pass
return Length,PMark
################################################################################
def Password(Length, PMark) :
'''Generate random passwords'''
# Key= 1: Upper case letter
# Key= 2: Lower case letter
# Key= 3: Digit
# Key= 4: Punc. mark
RetVal= ""
Letters= "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
letters= "abcdefghijklmnopqrstuvwxyz"
Digits= "0123456789"
Punct= "~@#$&%*_"
i= 1
while i <= Length :
Key= randint(1, 4)
if Key == 1 :
Index= randint(0, 25)
RetVal+= Letters[Index]
elif Key == 2 :
Index= randint(0, 25)
RetVal+= letters[Index]
elif Key == 3 :
Index= randint(0, 9)
RetVal+= Digits[Index]
elif Key == 4 :
if PMark != "y" : continue
Index= randint(0, 7)
RetVal+= Punct[Index]
i+= 1
pass
return RetVal
################################################################################
def main() :
'''The main program: run as stand-alone script'''
Length,PMark= Options(sys.argv[1:])
if Length <= 0 or Length > 16 :
WriteOut(LENGTH_ERR)
Length= 0
if not Length :
print("\nUsing interactive mode...")
if PMark == "n" : PMark= raw_input("Use puncruation? y|n [ n ] ")
while 1 :
Len_str= raw_input("Enter length of password--> ")
Length= int(Len_str)
if Length > 0 and Length < 17 : break
else : print("\nPassword must be between 1 and 16 characters in length")
pass
print("Here is your password: {0}\n".format(Password(Length, PMark)))
sys.exit(0)
################################################################################
if __name__ == '__main__' : main()
