Python import cache test

a.py

import b, c

print __name__, ":", c.msg
print __name__, ":", c is b.c

print __name__, ":", "reload c"
reload(c)

print __name__, ":", c.msg
print __name__, ":", c is b.c
print __name__, ":", b.c.msg

b.py

print __name__, "enter"

import c

print __name__, ":", c.msg
c.msg = "I say B!"

print __name__, "exit"

c.py

print __name__, "enter"

msg = "I am C."

print __name__, "exit"

execute

python a.py

output

b enter
c enter
c exit
b : I am C.
b exit
__main__ : I say B!
__main__ : True
__main__ : reload c
c enter
c exit
__main__ : I am C.
__main__ : True
__main__ : I am C.