print(‘from the spam.py‘)

money=1000

def read1():
    print(‘spam->read1->money‘,1000)

def read2():
    print(‘spam->read2 calling read‘)
    read1()

def change():
    global money
    money=0

money = 9999999
import spam     #from the spam.py
#第一件事:创建名称空间，用来存放spam.py中定义的名字
#第二件事:基于刚刚创建的名称空间来执行spam.py
#第三件事:创建名字spam指向该名称空间，spam.名字的操作，都是以spam.py为准
print(spam.money)   #1000

spam.read1()    #   spam->read1->money 1000
def read1():
    print(‘test read1‘)

spam.read2()    #spam->read2 calling read   spam->read1->money 1000

spam.change()
print(spam.money)