The 5th chapter uses the Python module

#导入模块干了哪些事:

#1 Execution Source files

#2 the global namespace as a source file

#3 get a module name at the current location, point to the namespace created by 2

# Import Spam

# money=100000000000

# def READ1 ():

# print (' from Test ')

# # print (Spam.money)

# # print (SPAM.READ1)

# # SPAM.READ1 ()

#

# # SPAM.READ2 ()

# Spam.change ()

# Print (Money)

# Spam.read1 ()

#

# Import spam as S1

# Print (S1.money)

# sql_type=input (' Sql_type: ')

# if Sql_type = = ' MySQL ':

# import MySQL as SQL

#

# elif Sql_type = = ' Oracle ':

# import Oracle as SQL

#

# Sql.sqlparse ()

Import Sys

Print (SYS)

Import spam

Print (spam)

#优点: Use the name in the source file without prefix, easy to use

#缺点: Easy to confuse with names in the current file's namespace

# From spam import Money,read1,read2,change

# money=0

# Print (Money)

# Print (READ1)

#

# Read1 ()

# def read1 ():p rint (' OK ')

# read2 ()

#

# money=10

# change ()

# Print (Money)

# From spam import money as M

#

# Print (m)

From spam import *

# Print (_money)

# Read1 ()

# Print (READ2)

Print (Money)

Print (x)

Print (READ1)

#模块只在第一次导入时才会执行, the subsequent import is a direct reference to the memory already existing results

Import Sys

Print (' spam ' in sys.modules) #存放的是已经加载到内的模块

Import spam

Print (' spam ' in sys.modules)

# Import Spam

# Import Spam

# Import Spam

# Import Spam

# Import Spam

The 5th chapter uses the Python module