python - 使用 open()，如何判断我是否在文件的最后一行？

Question

我有:

with open(self.corpus_file) as infile:
    for line in infile:

如何判断 line 是否是 infile 中的最后一行？

如果重要的话，这是 Python 3.6。

Answer 1

这里有一个简单的方法:

from itertools import tee

with open(self.corpus_file) as infile:
    infile, check = tee(infile)
    try:
        next(check)
    except StopIteration:
        # file is empty
    for line in infile:
        try:
            next(check)
        except StopIteration:
            # line is the last line

另一种更简单的方法，如果您不必留在循环中:

with open(self.corpus_file) as infile:
    for line in infile:
        pass

# line is now the last line