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Python: Check 2 text files for string and print contexts

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Old 01-30-2013
Python: Check 2 text files for string and print contexts
I have 2 text files:

cities.txt
Code:
San Francisco
Los Angeles
Seattle
Dallas

master.txt
Code:
Atlanta is chill and laid-back.
I love Los Angeles.
Coming to Dallas was the right choice.
New York is so busy!
San Francisco is fun.
Moving to Boston soon!
Go to Seattle in the summer.

output.txt
Code:
<main><beg>I love</beg><key>Los Angeles</key><end></end></main>
<main><beg>Coming to</beg><key>Dallas</key><end>was the right choice</end></main>
<main><beg></beg><key>San Francisco</key><end>is fun</end></main>
<main><beg>Go to</beg><key>Seattle</key><end>in the summer</end></main>

Each entity in cities.txt is the <key>. The master.txt file is much longer, and all lines without the city in cities.txt should just be ignored. They're not in order. The output prints out the cities in <key> and <beg> & <end> context (if any).

This is what I have:
Code:
with open(master.txt) as f:
    master = f.read()
working = []
with open(cities.txt) as f:
    for i in (word.strip() for word in f):
        if i in master:
                print "<key>", i, "</key>"

I can find the cities in the master file and print them out to a new file, but I'm stuck at how I can also print out the beginning and end contexts for the lines with the cities
Last edited by Scrutinizer; 01-30-2013 at 05:34 PM.. Reason: extra code tags
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