循环中的Readline（）在python中不起作用

Question

I have a file called file with this text:

Hello
I am not a bot
I am a human
Do you believe me?
I know you won't
Yes I am a bot
Yes you thought it right

This code prints out all the lines of the text:

with open(file) as f:
    for i in f:
        print(i,end="")

But this code does not, and I don't understand why.

with open(file) as f:
    for i in f:
        print(f.readline(),end="")

This prints out:

I am not a bot
Do you believe me?
Yes I am a bot

What I understand is as the loop goes over the lines in the file, it will read that line and return that as a string which is then printed. If I replace the for loop with for i in range(9) , it works.

Answer 1

文件对象上的for循环隐式地调用readline （或等效方法），因此发生的是，在每个循环中，您两次调用readline ，这就是为什么每隔一行获取一次的原因