CODEWITHSUNDEEP
pythonfunctionrecursion
zweed4u
zweed4u

Reputation: 217

Recursion to Iteration? Max recursion depth exceeded

I have a program that I want to indefinitely run that displays a random 5 long alphanumeric string with time generated. I have a condition that checks the string to display that a substring was included in the generation. The problem is that I get the error:

RuntimeError: maximum recursion depth exceeded

I have the following:

import random,datetime
def gen():
    global rand
    rand=''.join(random.choice('0123456789abcdefghijklmnopqrstuvwxyz') for i in range(5))
    return rand

def main(num):
    print datetime.datetime.now(),'::',num
    if 'xxx' in num:
        print 'Generated string contains xxx! Continuing...'
        main(gen())
    else:
        print datetime.datetime.now(),'::', num
        'xxx not in string.'
        main(gen())

main(gen())

How can I go about converting this or rectifying this issue? Thank you

Upvotes: 0

Views: 155

Answers (1)

TigerhawkT3
TigerhawkT3

Reputation: 49318

Simply use an infinite loop, and call gen() from within the loop rather than passing it as an argument to main:

def main():
    while 1:
        num = gen()
        print datetime.datetime.now(),'::',num
        if 'xxx' in num:
            print 'Generated string contains xxx! Continuing...'
        else:
            print datetime.datetime.now(),'::', num
            'xxx not in string.'

main()

Upvotes: 2

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