my_list = ["", "", ""]

my_file = open("myfile.txt", "w")

for item in my_list:

    my_file.write(item + "\n")            
    my_file.writelines(my_list)           // 写多个

my_file.close()

my_file = open("myfile.txt", "r")

print(my_file.read())                    // 一次性读取整个文件

my_file.close()

my_file = open("myfile.txt", "r")

print(my_file.readline())                // 读一行

print(my_file.readline())                // 再读下一行

my_file.close()

my = open("myfile.txt")

for line in my:

    print(line + " aaa ")

with open("myfile.txt", "w") as with_as_writ:

    with_as_writ.write("aaa")