from timeit import timeit

def change_list(my_list):
    for i in range(len(my_list)):
        if my_list[i] == 'a':
            my_list[i] = 'e'
        elif my_list[i] == 'e':
            my_list[i] = 'i'
        elif my_list[i] == 'i':
            my_list[i] = 'o'
        elif my_list[i] == 'o':
            my_list[i] = 'u'
        elif my_list[i] == 'u':
            my_list[i] = 'a'

def change_list_1(my_list):
    results = []
    for element in results:
        if element == 'a':
            results.append('e')
        elif element == 'e':
            results.append('i')
        elif element == 'i':
            results.append('o')
        elif element == 'o':
            results.append('u')
        elif element == 'u':
            results.append('a')
        else:
            results.append(element)
    return results
            


test = list('anapurna is a mountain in the argentinan andes')
print(test)
change_list(test)
print(test)
test = list('anapurna is a mountain in the argentinan andes')
print(change_list_1(test))
test = list('anapurna is a mountain in the argentinan andes')
print(timeit('change_list(test)', globals = globals()))
test = list('anapurna is a mountain in the argentinan andes')
print(timeit('change_list_1(test)', globals = globals()))