function函数

 

1. 内层函数没有引用外层函数局部变量,dir()是不会显示的
   

   def b(a):
       def p():
           print('function p dir ->',dir())
       p()
       print('function b dir ->',dir())
   b(2)

   

    

    

   def b(a):
       def p():
           nonlocal a
           print('function p dir ->',dir())
       p()
       print('function b dir ->',dir())
   b(2)

   

    

    
   
   

   def b(a):
       def p():
           print('function p dir ->',dir())
           return a
       p()
       print('function b dir ->',dir())
   b(2)

   

    

    

2. 要想调用直接调用内层函数,必须先调用外层函数,将内层函数返回,用变量保存
   

   def b():
       def p():
           print('pppp')
       return p
   v=b()
   v()
   print(v.__name__,v)

   

    

    

   indicator=0
   def b():
       global indicator
       def p1():
           print('11111111')
   
       def p2():
           print('2222222222')
   
       def p3():
           print('3333333333333')
   
       def p4():
           print('4444444444444444444')
   
       if indicator==0:
           return None
       elif indicator==1:
           return p1
       elif indicator==2:
           return p2
       elif indicator==3:
           return p3
       elif indicator==4:
           return p4
       else:
           raise NotImplementedError('indicator is wrong!')
   
   v=b()
   print(v)
   indicator=1
   v1=b()
   print(v1.__name__,v1)
   indicator=2
   v2=b()
   print(v2.__name__,v2)