python-reload()

1. Need to import from impimport reload

2. reload(a) will only reload a, while keeping the other modules imported in a unchanged

eg:

c.py

        z = 3

b.py

        import c

        y = 2

a.py

        import b

        x = 1

Execute the following code on the command line

>>>import a

>>>a.x,a.b.y,a.b.c.z

        (1,2,3)

At this point, modify a.py

        import b

        x = 111

Modify b.py

        import c

        y = 222

Execute the following statement on the command line

>>>from  imp import reload

>>>reload(a)

>>>a.x,a.b.y,a.b.c.z

           (111,2,3)

Note: Only the modification of a.py takes effect at this time