python读取输入流,Python命令行'文件输入流'

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概述

I'm fairly new to python coming from C/C++, I was wondering how I would get my 'main.py' to reconize/use the imput given from a bash shell as:

python main.py < text.txt

(the file is in plain text)

解决方案

I would use argparse to create an option parser that accepts a file path and opens it.

import argparse

def main():

parser = argparse.ArgumentParser()

parser.add_argument('infile', type='open')

args = parser.parse_args()

for line in args.infile:

print line

if __name__ == '__main__':

main()

If type='open' does not provide enough control, it can be replaced with argparse.FileType('o') which accepts bufsize and mode args (see http://docs.python.org/dev/library/argparse.html#type)

EDIT: My mistake. This will not support your use case. This will allow you to provide a filepath, but not pipe the file contents into the process. I'll leave this answer here as it might be useful as an alternative.