Read the log file, search for keywords, print the first 5 lines of keywords. Yield, deque instances

Source: Internet
Author: User
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)

if __name__ = = ' __main__ ':
With open (' Log.txt ', ' R ', encoding= ' utf-8 ') as F:
For line, prevlines in search (f, ' return ', 1):
For Pline in Prevlines:
Print (pline,end= ")
Print (line,end= ")
Print ('-' *20)

Read the log file, search for keywords, print the first 5 lines of keywords. Yield, deque instances

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