python将列表内偶数复制输出

Question

def duplicate_evens(numbers_list):

Answer 1

def duplicate_evens(numbers_list:list):
    i=0
    while i < len(numbers_list):
        if numbers_list[i]%2==0:
            numbers_list.insert(i, numbers_list[i])
            i+=1
        i+=1

numbers=[11,12,13,14,15,16]
duplicate_evens(numbers)
print(numbers)

如果可以从后向前遍历，也可以这样写：

def duplicate_evens(numbers_list:list):
    for i in range(len(numbers_list)-1,-1,-1):
        if numbers_list[i]%2==0:
            numbers_list.insert(i,numbers_list[i])

numbers=[11,12,13,14,15,16]
duplicate_evens(numbers)
print(numbers)