Python在其他字符之间随机插入字符

from random import randint
string = 'Hello world. Hello world.'

for char in ['!','-','=','~','|']:
    pos = randint(0, len(string) - 1)  # pick random position to insert char
    string = "".join((string[:pos], char, string[pos:]))  # insert char at pos

print(string)