但是有时候，我们想自己控制读取每一行，即open得到fp后，readline()，何时是退出呢？

经过查找N多文档，得到一种很隐晦的说法是当返回空串时表示退出。

于是写法是：

fp = ....
while True:
    line = fp.readline()
    if len(line)==0:
        break
    #.....
    Do what you want

其实，可以不用len判断，而用not判断。Python中，空串的not返回True，即not line时为读到EOF，如下：

fp = ....
while True:
    line = fp.readline()
    if not line:
        break
    #.....
    Do what you want

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