python怎么返回列表元素索引？

#!/usr/bin/python

list = [1,3,4,2,1,2,2]

str2 = 2

print(list.index(str2))

def get_same_element_index(ob_list, word):

    return [i for (i, v) in enumerate(ob_list) if v == word]

if __name__ == "__main__":

    ob_list = [1,3,4,2,1,2,2]

    word = 2

    print("{0} 在列表 {1} 中的索引: {2}".format(word, ob_list, get_same_element_index(ob_list, word)))