CODEWITHSUNDEEP
pythonescapingunicode-escapes
Joe
Joe

Reputation: 1

Escaping escape sequence in Python

I am kind of new to python. Goal is to execute a shell command using subprocess parse & retrive the printed output from shell. The execution errors out as shown in the sample output msg below. Also shown below is the sample code snippet

Code snippet:

testStr = "cat tst.txt | grep Location | sed -e '/.*Location: //g' "
print "testStr = "+testStr
testStrOut = subprocess.Popen([testStr],shell=True,stdout=subprocess.PIPE).communicate()[0]

Output:

testStr = cat tst.txt | grep Location | sed -e '/.*Location: //g' 
cat: tst.txt: No such file or directory
sed: -e expression #1, char 15: unknown command: `/'

Is there a workaround or a function that could be used ?

Appreciate your help Thanks

Upvotes: 0

Views: 766

Answers (2)

Lee D
Lee D

Reputation: 116

You should be passing testStr directly as the first argument, rather than enclosing it in a list. See subprocess.Popen, the paragraph that starts "On Unix, with shell=True: ...".

Upvotes: 1

Speckinius Flecksis
Speckinius Flecksis

Reputation: 624

I suppose your main error is not python related. To be more precise, there are 3 of them:

  1. You forgot to import subprocess.
  2. It should be sed -e 's/.*Location: //g'. You wrote ///g instead of s///g.
  3. tst.txt does not exist.

Upvotes: 1

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