由于你不知道换行符在哪里，因此无法至少一次不读入文件就无法跳转。你可以执行以下操作：
# Read in the file once and build a list of line offsets
line_offset = []
offset = 0
for line in file:
line_offset.append(offset)
offset += len(line)
file.seek(0)
# Now, to skip to line n (with the first line being line 0), just do
file.seek(line_offset[n])
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