python 如何遍历命令行上传递的所有文件行？
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How do I iterate over all lines of files passed on the command line?
提问by Tg.
I usually do this in Perl:
我通常在 Perl 中这样做：
whatever.pl
随便.pl
while(<>) {
#do whatever;
}
then cat foo.txt | whatever.pl
然后 cat foo.txt | whatever.pl
Now, I want to do this in Python. I tried sys.stdinbut I have no idea how to do as I have done in Perl. How can I read the input?
现在，我想在 Python 中做到这一点。我试过了，sys.stdin但我不知道该怎么做，就像我在 Perl 中所做的那样。我怎样才能读取输入？
回答by Don Werve
Try this:
试试这个：
import fileinput
for line in fileinput.input():
process(line)
回答by Mark Roddy
import sys
def main():
for line in sys.stdin:
print line
if __name__=='__main__':
sys.exit(main())
回答by David Z
Something like this:
像这样的东西：
import sys
for line in sys.stdin:
# whatever
回答by Can Berk Güder
import sys
for line in sys.stdin:
# do stuff w/line
回答by Vishal Kotcherlakota
I hate to beat a dead horse, but may I suggest using a pure function?
我讨厌打败一匹死马，但我可以建议使用纯函数吗？
import sys
def main(stdin):
for line in stdin:
print("You said: " + line.strip())
if __name__ == "__main__":
main(sys.stdin)
This approach is nice because main is dependent purely on its input and you can unit test it with anything that obeys the line-delimited input stream paradigm.
这种方法很好，因为 main 完全依赖于它的输入，您可以使用任何符合行分隔输入流范式的内容对其进行单元测试。
