1test = "hello world"
2
3if test is not None:
4 print("test is not None")
5
6test2 = None
7
8if test2 is None:
9 print("test2 is None")
1
2#variable
3var = "hello python"
4
5#check is not null
6if var is not NaN:
7 print('Var is not null')
8
9