python readline()逐行读,怎么判断已到末尾?

Answer 1

两种方法:

1. for ... in ...

with open("file") as fh:
    for line in fh:
        print(line.strip())

2. while fh.readline():

with open("file") as fh:
    line = fh.readline()
    while line:
        print(line.strip())
        line = fh.readline()

最简洁优雅又高效的自然是第一种, 如果题主非要用readline(), 则可以使用第二种, while循环, 读到最后一行没有内容会退出循环, 中间有空行不要紧, 空行不等于结尾(\n != EOF)

Answer 2

http://www.jb51.net/article/5...

Answer 3

for ... in ...:

with open('filename') as fp:
    for line in fp:
        # do something

Answer 4

with open('filename','r') as f:

while True:
    line=f.readline()
    if line:
        print (line)
    else:
        break

Answer 5

• 你說的沒錯, readlines 是絕對不要使用的!

  • 請參考 Python 如何實現並行查找關鍵字所在的行 和 Never call readlines() on a file

• 一般的文件讀取(從頭到尾讀一遍), 請使用 for line in file 來迭代文件, 簡潔又不容易出錯

• readline 可能會用在當讀取順序比較複雜的時候

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我回答過的問題: Python-QA