regex - Include surrounding lines of text file match in output using Python 2.7.3 -

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i've been working on program assists in log analysis. finds error or fail messages using regex , prints them new .txt file. however, more beneficial if program including top , bottom 4 lines around match is. can't figure out how this! here part of existing program:

def error_finder(filepath): source = open(filepath, "r").readlines() error_logs = set() my_data = [] line in source:     line = line.strip()     if re.search(exp, line):         error_logs.add(line)

i'm assuming needs added last line, i've been working on bit , either not applying myself or can't figure out.

any advice or on appreciated.

thank you!

why python?

grep -c4 '^your_regex$' logfile > outfile.txt

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