python - 追加和读取相同的文件 - Python

Question

卡在这个学校问题上，我错过了什么？

"Objective: Complete the function to append the given new data to the specified file then print the contents of the file"

在我的多次尝试中:

import os
def appendAndPrint(filename, newData):
    with open(filename, 'a') as f:
        f = f.write(newData)
        r = f.read()
        print(r)

Test case, expected output: Hello World

with open("test.txt", 'w') as f: 
    f.write("Hello ")
appendAndPrint("test.txt", "World")

如果我让解释器不抛出错误，在几次尝试中它只会打印 5。

Answer 1

此代码应该工作:

def append_and_print(filename, new_data):
    with open(filename, "a") as f:
        f.write(new_data)
    with open(filename, "r") as f:
        print(f.read())