input 2

# case 1 : import external module as nicename
x = 10
print(x)
import dio as lib
def a():
    print ("I am from function a")
a()
lib.b()
print(lib.x,x)
# case 2 : import module name
import dio
dio.b()
print(dio.x)
print(dio._y)
# case 3 : import everything from module, ease local function
from dio import *
b()
print(x)
# can't import _y
#======================
# case 4 : import sub module by names
from dio import b, _y
b()
print(_y)