Referring to the null object in Python
In Python, the ‘null’ object is the singleton None. The best way to check things for “Noneness” is to use the identity operator, is:
null
What is a NullReferenceException, and how do I fix it?
What is the cause? Bottom Line You are trying to use something that is null (or Nothing in VB.NET). This means you either set it to null, or you never set it to anything at all. Like anything else, null gets passed around. If it is null in method “A”, it could be that method “B” passed a null to method “A”. null can have different meanings: Object variables … Read more