Created
April 10, 2015 14:09
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keeping the last n items
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from collections import deque | |
def search(lines, pattern, history=5): | |
previous_lines = deque(maxlen=history) | |
for line in lines: | |
if pattern in line: | |
yield line, previous_lines | |
previous_lines.append(line) | |
# Example use on a file | |
if __name__ == '__main__': | |
with open('somefile.txt') as f: | |
for line, prevlines in search(f, 'python', 5): | |
for pline in prevlines: | |
print(pline, end='') | |
print(line, end='') | |
print('-'*20) |
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