Python -- reload 函数

在Python2 中的内置函数reload（）

在Python3 中使用时 ， 须要从imp 总导入 

from imp import reload

imp.reload(module)  

    Reload a previously imported module. The argument must be a module object, so it must have been successfully imported before. This is useful if you have edited the module source file using an external editor and want to try out the new version without leaving the Python interpreter. The return value is the module object (the same as the module argument).