比如：
import linecacheprint linecache.getline('2.1_open.py', 4)
将返回我上一节事例代码文件2.1_open.py的第4行文字，输出结果：
f = open('/home/evergreen/桌面/test')
查看linecache中的实现(我用的是Ulipad，所以直接将光标停留在linecache处，按F6键)
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