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Python None Keyword
The None keyword in Python is used when we need to declare a variable with no value at all. The interesting thing about the None keyword is, it is a constant value with no value at all.
None is neither a 0 nor an empty string like "". That is, None is None, nothing else. For example:
a = None b = 0 c = "" print(type(a)) print(type(b)) print(type(c))
The output is:
<class 'NoneType'> <class 'int'> <class 'str'>
It means that, like 0 is of int type, "" is of str type. Similarly, None is of NoneType value.
Note - Python is a case-sensitive language, therefore keep the first letter of None keyword in capital letter, and remaining 3 letters must be in small letters.
Python None Keyword Example
Here is an example of None keyword in Python. This program demonstrates that, a function with no return value will return None:
def funOne(): x = 10 def funTwo(): x = 100 return x x = funOne() print(x) x = funTwo() print(x)
The output is:
None 100
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