万一您的文本文件中有多个“开始”和“结束”，这会将所有数据一起导入，不包括所有“开始”和“结束”。
with open('path/to/input') as infile, open('path/to/output', 'w') as outfile:
copy = False
for line in infile:
if line.strip() == "Start":
copy = True
continue
elif line.strip() == "End":
copy = False
continue
elif copy:
outfile.write(line)
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