Program gives error "List indices must not be string"

>>> player=[1,2,3]
>>> player["score"]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: list indices must be integers, not str
>>> player={'score':1, 'age': 2, "foo":3}
>>> player['score']
1

id_key = {} # replaced [] with {}

for row in my_data:
    eventid = pattern_id.findall(row.decode('utf-8'))[0] # note added [0]
    eventkey = pattern_key.findall(row.decode('utf-8'))[0]
    id_key[eventid] = eventkey

id_key = {pattern_id.findall(row.decode('utf-8'))[0]: 
          pattern_key.findall(row.decode('utf-8'))[0] for row in my_data}

def id_and_key(line):
    return (pattern_id.findall(line)[0],  
            pattern_key.findall(line)[0])

id_key = dict(id_and_key(row.decode('utf-8')) for row in my_data)

string = "And now for something completely different"
vowel = "aeiouAEIOU"

for i in range(0, len(string)):
    if string[i] in vowel:  
        print(string[i])

x = letterArray[posY][posX]

gifts[-1 + end_verse]
gifts[end_verse - 1]
gifts[-1]
gifts[end_verse]