When python does import, does it import names in 'import' statement? -

i don't have clear understanding of python's import mechanism. 1 thing confuses me is: when python imports module, imports names imported there. here code:

# a.py def a_func():    pass;  # b.py import *; def b_func():    pass;  # c.py b import *; def c_func():    # can use b_func, ok, no problem.    # can use a_func here, import recursive? 

if python recursively imports, code bad pratice? happens if add

from import *; 

to c.py? cause overhead importing twice? or should avoid 'from xx import *' , import needed name?

thanks!

code executed first time import called module. subsequent imports copy names , references.

having said that, don't import *.