在 python 列表中的任意索引处插入一个元素

Question

def func04():
    my_list = []

    my_list.insert(400, "s400")

    my_list.insert(5, "s5")
    my_list.insert(2, "s2")
    my_list.insert(4, "s4")
    my_list.insert(1, "s1")
    my_list.insert(3, "s3")
    my_list.insert(0, "s0")

    # my_list.sort()
    print(f'my_list: {str(my_list)}')

>>> my_list: ['s0', 's400', 's1', 's5', 's3', 's2', 's4']

What is the login behind this sequence in python? Can anyone clarify

Answer 1

If you specify an index that is larger than the list currently, then it will just append to the end of the list.

my_list = []                 # []
my_list.insert(400, "s400")  # [s400]
my_list.insert(5, "s5")      # [s400, s5]
my_list.insert(2, "s2")      # [s400, s5, s2]
my_list.insert(4, "s4")      # [s400, s5, s2, s4]
my_list.insert(1, "s1")      # [s400, s1, s5, s2, s4]
my_list.insert(3, "s3")      # [s400, s1, s5, s3, s2, s4]
my_list.insert(0, "s0")      # [s0, s400, s1, s5, s3, s2, s4]