[英]How to replace unique string between two separators/strings multiple times
我正在浏览文件夹/目录并读取所有文件,检查是否有特定标签,然后仅在特定字符串在两个特定字符串/标签之间时才多次替换特定字符串。 这是文本文件的示例:
START $YES
N1 000 001 002
N2 TAG#1 004 008
N3 This is an apple
N4 006 005 003
(( TAG#2 ))
N5 This is an apple
我想要一个可以打开文件,检查START $YES
或START $NO
并替换字符串的解决方案, This is an apple
进入TAG#1
和TAG#2
之间There is no apple
,仅当存在START $YES
。 我希望原始文件不受影响(使用fileinput
库创建新文件或创建备份)。
目前,我无法发布python代码,但是当我回到办公桌时,将使用尝试的代码来更新此帖子。
import shutil
def func(srcname, dstname):
replace = False
with open(srcname) as srcfile:
with open(dstname, 'w+') as dstfile:
line = srcfile.readline().strip()
if "START $NO" in line:
srcfile.seek(0)
shutil.copyfileobj(srcfile, dstfile)
return
while line:
if "TAG" in line and not replace:
replace = True
if "TAG" in line and replace:
replace = False
if replace and "This is an apple" in line:
line = line.replace("This is an apple", "There is no apple")
dstfile.write(line)
line = srcfile.readline().strip()
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