Convert random characters in a string to uppercase

Question

I'm try to append text strings randomly so that instead of just having an output like

>>>david

I will end up having something like

>>>DaViD
>>>dAviD

the code i have right now is this

import random
import string

print "Name Year"
text_file = open("names.txt", "r")
for line in text_file:
    print line.strip()+"".join([random.choice(string.digits) for x in range(1, random.randint(1,9))])

and it outports this

>>>JOHN01361

I want that string to be somthing like

>>>jOhN01361
>>>john01361
>>>JOHN01361
>>>JoHn01361

Answer 1

Well, your specification is actually to randomly uppercase characters, and if you were so inclined, you could achieve that with the following list comprehension:

import random

s = "..."
s = "".join( random.choice([k.upper(), k ]) for k in s )

but there may be nicer ways ...

Answer 2

you probably want to do something like:

import random

lol = "lol apples"

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

lol =''.join(map(randomupper, lol))

---

EDIT:

As pointed out by Shawn Chin in the comments, this can be simplified to:

lol = "".join((c.upper(), c)[random() > 0.5] for c in lol)

Very cool and, but slower than using map.

---

EDIT 2:

running some timer tests, it seems that
"".join( random.choice([k.upper(), k ]) for k in s )
is over 5 times slower than the map method, can anyone confirm this?
Times are:

no map:        5.922078471303955
map:           4.248832001003303
random.choice: 25.282491881882898