Randomizing the upper and lowercase of a string

Question

Is there a more efficient / smarter way of randomizing the uppercasing of letters in a string ? Like this:

input_string = "this is my input string"
for i in range(10):
    output_string = ""
    for letter in input_string.lower():
        if (random.randint(0,100))%2 == 0:
            output_string += letter
        else:
            output_string += letter.upper()
    print(output_string)

Output:

thiS iS MY iNPUt strInG
tHiS IS My iNPut STRInG
THiS IS mY Input sTRINg
This IS my INput STRING
ThIS is my INpUt strIng
tHIs is My INpuT STRInG
tHIs IS MY inPUt striNg
THis is my inPUT sTRiNg
thiS IS mY iNPUT strIng
THiS is MY inpUT sTRing

''.join(c.upper() if random() > 0.5 else c for c in input_string) — Maroun
– Maroun, Commented Aug 7, 2017 at 13:04
@MarounMaroun I'm using timeit on the four ways (including mine) and your way seems to beat everyone by a large margin. (Couldn't get the map way to work though) — François M.
– François M., Commented Aug 7, 2017 at 13:24
For a fair test you should do ''.join(c.upper() if random() > 0.5 else c for c in input_string.lower()), but checking the implementation actually I'm not surprised random.choice() is slower (but more readable). You could also try ''.join(lst[random.getrandbits(1)](c) for c in s). Also, should it be >=? @MarounMaroun relevant question: stackoverflow.com/questions/6824681/… — Chris_Rands
– Chris_Rands, Commented Aug 7, 2017 at 13:40

Chris_Rands · Accepted Answer · 2017-08-07 13:06:09Z

9

You could use random.choice(), picking from str.upper and str.lower:

>>> from random import choice

>>> s = "this is my input string"
>>> lst = [str.upper, str.lower]

>>> ''.join(choice(lst)(c) for c in s)
'thiS IS MY iNpuT strIng'

>>> [''.join(choice(lst)(c) for c in s) for i in range(3)]
['thiS IS my INput stRInG', 'tHiS is MY iNPuT sTRinG', 'thiS IS my InpUT sTRiNg']

answered Aug 7, 2017 at 13:06

Chris_Rands

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Comments

Maroun · Accepted Answer · 2017-08-07 13:27:57Z

1

you could use a map and apply a random factor with the string to do it like this:

import random

StringToRandomize = "Test String"

def randomupperfactor(c):
   if random.random() > 0.5:
      return c.upper()
   else:
      return c.lower()

StringToRandomize =''.join(map(randomupperfactor, StringToRandomize))

edited Aug 7, 2017 at 13:27

Maroun

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answered Aug 7, 2017 at 13:06

Missing_DLL

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1 Comment

Chris_Rands Over a year ago

@MarounMaroun I did not downvote, the approach is fine, but I think an else clause is missing. Also the variable names should ideally conform to PEP8 and not be capitalized

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