Python3中 if not 用法

 1 var = None
 2 
 3 def fun_not_var(var_data):
 4     if not var_data:
 5         print(‘aaaaaa‘)
 6     else:
 7         print(‘bbbbbb‘)
 8 fun_not_var(var)
 9    
10 # result: aaaaaa
11    
12   
13 def fun_var(var_data):
14     if var_data:
15         print(‘aaaaaa‘)
16     else:
17         print(‘bbbbbb‘)
18 fun_var(var)
19 
20 # result: bbbbbb