findstr /v "提示" xx.txt
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#!/usr/bin/env python
# python 3.5.1
# coding:utf-8
wFile = open('new.txt', 'w')
with open('old.txt', 'r') as file:
    for i in file:
        if not i.startswith('提示:'):
            print(i, end='',  file=wFile)

wFile.close()
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