[英]How do I iterate over all lines of files passed on the command line?
I usually do this in Perl: 我通常在Perl中这样做:
whatever.pl whatever.pl
while(<>) {
#do whatever;
}
then cat foo.txt | whatever.pl
那么
cat foo.txt | whatever.pl
cat foo.txt | whatever.pl
Now, I want to do this in Python. 现在,我想用Python做到这一点。 I tried
sys.stdin
but I have no idea how to do as I have done in Perl. 我试过
sys.stdin
但我不知道怎么做,就像我在Perl中做的那样。 How can I read the input? 我该如何阅读输入?
Try this: 试试这个:
import fileinput
for line in fileinput.input():
process(line)
import sys
def main():
for line in sys.stdin:
print line
if __name__=='__main__':
sys.exit(main())
Something like this: 像这样的东西:
import sys
for line in sys.stdin:
# whatever
import sys
for line in sys.stdin:
# do stuff w/line
I hate to beat a dead horse, but may I suggest using a pure function? 我讨厌击败死马,但我可以建议使用纯粹的功能吗?
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,你可以用符合行划分的输入流范例的任何东西对它进行单元测试。
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