import sys
find_str = input('请输入被修改的内容:')
replace_str = input('请输入要替换的内容:')
sing = open('《yesterday once more》歌词','r')
sing_bak1 = open('《yesterday once more》歌词(bak1)','w')
for line in sing:
if find_str in line:
line = line.replace(find_str,replace_str)
sing_bak1.write(line)
sing.closed
sing_bak1.closed
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