CODEWITHSUNDEEP
pythonpython-3.xpython-2.7
Justin Carrey
Justin Carrey

Reputation: 3851

Generate all strings up to desired length

I want to generate all the random strings having length varying from 1 till max_length. Is is there an in-built function in python that would do that? If not, please tell me how to do this or direct me to posts which covers this type of problem. Thanks in advance.

Upvotes: 2

Views: 912

Answers (2)

Ashwini Chaudhary
Ashwini Chaudhary

Reputation: 250921

you can use random.sample():

In [28]: from string import ascii_lowercase as asl

In [29]: import random

In [30]: max_length=10

In [31]: for x in xrange(1,max_length+1):
   ....:     ''.join(random.sample(asl,x))
   ....:     
   ....:     
Out[31]: 'k'
Out[31]: 'jy'
Out[31]: 'ldo'
Out[31]: 'ivlr'
Out[31]: 'gqelt'
Out[31]: 'gbvnqw'
Out[31]: 'baestog'
Out[31]: 'kyijhmvn'
Out[31]: 'toshxklwb'
Out[31]: 'wihtmouexg'

Upvotes: 2

nneonneo
nneonneo

Reputation: 179392

Random strings:

import random
def get_random_string(alphabet, slen):
    return ''.join(random.choice(alphabet) for _ in xrange(slen))

print get_random_string('0123456789', 5) # prints e.g. 62247

All strings in lexicographical order (thanks @DSM for reminding me about itertools):

import itertools
def gen_all_strings(alphabet, slen):
    it = itertools.product(alphabet, repeat=slen)
    return (''.join(s) for s in it)

print list(gen_all_strings('abc', 2)) # prints ['aa', 'ab', 'ac', 'ba', 'bb', 'bc', 'ca', 'cb', 'cc']

Upvotes: 3

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