#!/usr/bin/env python
# -*- coding: utf-8 -*-


"""
Napisz funkcję pokemon_speak, która zamienia w podanym napisie co drugą literę
na wielką. Np. pokemon_speak('pokemon') powinno zwrócić 'PoKeMoN'.
"""
#tekst=("edyta")
#def pokemon_speak(tekst):
    #for litera in tekst:
        #if litera in tekst[::2]:
            #return litera.upper()

#def pokemon_speak(text):

    #return [text.upper() for x in text[::2]]


#def pokemon_speak(text):

    #return [x.upper() for x in text[::2]]

    #if litera in text[::2]:
        #return text[::2].upper()
    #else:
        #return text[::1].lower()


#pokemon_speak("edytarenkjacek")
def pokemon_speak(text):
    indices=set([0,2,4,6,8,10,12,14,16,18])
    #indices=set(index(text[::2]))
    return("".join(c.upper() if i in indices else c for i, c in enumerate(text)))

# def fold(s):
#     uppers = s[0::2].upper()
#     lowers = s[1::2].lower()
#     return zip(uppers, lowers)

# def fold(s):
#     time_to_upper = True
#     result = ""
#     for ch in s:
#         if time_to_upper:
#             result += ch.upper()
#         else:
#             result += ch.lower()
#         time_to_upper = not time_to_upper
#     return result
#
# def fold(s):
#     time_to_upper = True
#     result = ""
#     for ch in s:
#         if time_to_upper:
#             result += ch.upper()
#         else:
#             result += ch.lower()
#         time_to_upper = not time_to_upper
#     return result
#
# s="edyta"
#indices=set([text[::2]])
def tests(f):
    inputs = [['pokemon'], ['do not want'], ['POKEMON']]
    outputs = ['PoKeMoN', 'Do nOt wAnT', 'POKEMON']

    for input, output in zip(inputs, outputs):
        if f(*input) != output:
            return "ERROR: {}!={}".format(f(*input), output)
            break
    return "TESTS PASSED"

if __name__ == "__main__":
    print(tests(pokemon_speak))