from和import 導入模塊
import 讀取整個模塊，而from只導入模塊中的某些變量和函數

# -*- coding: utf-8 -*- """ Spyder EditorThis is a temporary script file. """ import testmodule print(testmodule.x) # -*- coding: utf-8 -*- """ Created on Sat Jan 23 13:54:16 2021@author: Administrator """ x=11 y=22 def testfun2():print("testfun2") def testfun1():print("testfun1") runfile('G:/learn/2.py', wdir='G:/learn') 11

import導入時，被導入模塊的全部頂層變量和語句將被執行

# -*- coding: utf-8 -*- """ Created on Sat Jan 23 13:54:16 2021@author: Administrator """ x=11 y=22 def testfun2():print("testfun2") def testfun1():print("testfun1")print("testmodule importing...")#if __name__ == "__main__": # print("testmodule runing...") # testfun1() # testfun2() # -*- coding: utf-8 -*- """ Spyder EditorThis is a temporary script file. """ import testmodule print(testmodule.x) testmodule.testfun1() print(testmodule.__name__) print(__name__) runfile('G:/learn/2.py', wdir='G:/learn') testmodule importing... 11 testfun1 testmodule __main__

被導入 模塊也可以直接執行

runfile('G:/learn/testmodule.py', wdir='G:/learn') testmodule importing...

通過Python中的if name == 'main’形式識別 是被導入 的還是直接執行的
下面是直接執行的

# -*- coding: utf-8 -*- """ Created on Sat Jan 23 13:54:16 2021@author: Administrator """ x=11 y=22 def testfun2():print("testfun2") def testfun1():print("testfun1")if __name__ == "__main__":print("testmodule runing...")testfun1()testfun2() else:print("testmodule importing...") runfile('G:/learn/testmodule.py', wdir='G:/learn') testmodule runing... testfun1 testfun2

下面是導入的

runfile('G:/learn/2.py', wdir='G:/learn') testmodule importing... 11 testfun1 testmodule __main__

被導入的__name__為模塊名，當前執行的__name__為__main__
將被導入模塊改為：

# -*- coding: utf-8 -*- """ Created on Sat Jan 23 13:54:16 2021@author: Administrator """ x=11 y=22 def testfun2():print("testfun2") def testfun1():print("testfun1")print(__name__)if __name__ == "__main__":print("testmodule runing...")testfun1()testfun2() else:print("testmodule importing...") runfile('G:/learn/testmodule.py', wdir='G:/learn') Reloaded modules: testmodule __main__ testmodule runing... testfun1 testfun2 runfile('G:/learn/2.py', wdir='G:/learn') testmodule testmodule importing... 11 testfun1 testmodule __main__

因此，被導入模塊可改成以下形式，效果一樣

# -*- coding: utf-8 -*- """ Created on Sat Jan 23 13:54:16 2021@author: Administrator """ x=11 y=22 def testfun2():print("testfun2") def testfun1():print("testfun1")if __name__ == "testmodule":print("testmodule importing...") else:print("testmodule runing...")testfun1()testfun2() runfile('G:/learn/testmodule.py', wdir='G:/learn') testmodule runing... testfun1 testfun2runfile('G:/learn/2.py', wdir='G:/learn') testmodule importing... 11 testfun1 testmodule __main__

總結

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