camelcase

#!/usr/bin/env python
from sys import stdin
import argparse
from random import uniform

helpmsg = "Convert text to camel case"
parser = argparse.ArgumentParser(description=helpmsg)
parser.add_argument('-c', '--cancer', action='store_true',
        help="Use cAnCEr cAmeL CAsE instead")
parser.add_argument('-m', '--max', nargs=1, metavar='N_CHARS', default=[1],
        type=int,
        help="(-c only) sets maximum # of chars of same capitalization")
parser.add_argument('-U', '--upper', action='store_true',
        help="(-c only) first character is uppercase (default: lowercase)")
parser.add_argument('string', nargs='*')

args = parser.parse_args()
upper = args.upper
args.max = args.max[0]

def apply(func):
    if args.string:
        print(func(' '.join(args.string)))
    else:
        with stdin:
            for line in stdin:
                print(func(line), end='')

def cancer(string):
    global upper
    ncase = int(uniform(0, args.max) + 1)
    case = upper and str.upper or str.lower
    string = string.lower()
    newstr = ''

    for char in string:
        if char.isalpha():
            if ncase > 0:
                ncase -= 1
            else:
                upper = not upper
                case = upper and str.upper or str.lower
                ncase = int(uniform(0, args.max))
            newstr += case(char)
        else:
            newstr += char

    return newstr

if args.cancer:
    if args.max < 1:
        raise ValueError("max cannot be less than 1")
    apply(cancer)
else:
    apply(str.title)