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Using GREP in PYTHON

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# 1  
Old 05-11-2010
Using GREP in PYTHON
Hello All, I currently have the following python code:

Code:
#usr/bin/python
import os

variable=raw_input('Search for this string: ')
os.system("grep $variable sample.txt")

Basically what I want to do is to grep a string found in the text file "sample.txt" When I run the code, it just hangs. How can I make it so that grep accepts the variable?
# 2  
Old 05-12-2010
I would try this:
Code:
#usr/bin/python
import os

variable=raw_input('Search for this string: ')
os.system("grep " + variable + " sample.txt")

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