42 lines
725 B
Python
42 lines
725 B
Python
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#!/usr/bin/env python
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# -*- encoding: utf-8 -*-
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"""
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Topic:
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利用generator模仿tail -f www.log | grep "python"
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对变化的日志文件持续查看含有python的行
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Desc :
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"""
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import time
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__author__ = 'Xiong Neng'
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def tail(f):
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f.seek(0, 2) # 移动到EOF
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while True:
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line = f.readline()
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if not line:
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time.sleep(0.2)
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continue
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yield line
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def grep(lines, search_text):
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for line in lines:
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if search_text in line: yield line
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def my_tail_search():
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wwwlog = tail(open("www.log"))
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pylines = grep(wwwlog, "python")
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for line in pylines:
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print(line)
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def main():
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pass
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if __name__ == '__main__':
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main()
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