python 2 7 check if variable is none

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Louis
21 Mar 2018
1>>> NoneType = type(None)
2>>> x = None
3>>> type(x) == NoneType
4True
5>>> isinstance(x, NoneType)
6True
source
Tom
05 Nov 2019
1# How to check if a variable is None
2
3var = None
4# variable is None in this example
5
6if var is None:
7  # if var is None
8  
9  print("var is None")
10  # code...
11  
12else:
13  # if var is not None
14  
15  print("var is not None")
16  # code...
17
18# result of above example "var is None"
19
20
21
22var = "sometext"
23# variable is not None in this example
24
25if var is None:
26  # if var is None
27  
28  print("var is None")
29  # code...
30  
31else:
32  # if var is not None
33  
34  print("var is not None")
35  # code...
36
37# result of above example "var is not None"
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