Question

6

How do I call a sed command in a python script?

rated 0 times [ 6] [ 0] / answers: 1 / hits: 67012 / 3 Years ago, tue, august 17, 2021, 11:39:21

Through python script, I am trying to replace a string by a string in a file using sed command. I do that through subprocess.call as it in the script.

When I run the command in the shell script or command, it runs fine, but in python I get a result saying "No input file".
Any idea how to fix that error?

#!/usr/bin/python

import subprocess

subprocess.call(["sed -i -e 's/hello/helloworld/g'","www.txt"], shell=True)

Output

No input file

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jectedrin

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3 Years ago

answered 3 Years ago riffnkful · Accepted Answer

You should avoid subprocess and implement the functionality of sed with Python instead, e.g. with the fileinput module:

#! /usr/bin/python

import fileinput

for line in fileinput.input("www.txt", inplace=True):

    # inside this loop the STDOUT will be redirected to the file

    # the comma after each print statement is needed to avoid double line breaks

    print line.replace("hello", "helloworld"),