and, or, notĪnd, or, not are the logical operators in Python. If we give the function an odd number, None is returned implicitly. The function will return True only when the input is even. Similarly, here is another example: def improper_return_function(a):Īlthough this function has a return statement, it is not reached in every case. So when we print x, we get None which is returned automatically (implicitly). This program has a function that does not return a value, although it does some operations inside. None is also returned by functions in which the program flow does not encounter a return statement. Void functions that do not return anything will return a None object automatically. We must take special care that None does not imply False, 0 or any empty list, dictionary, string etc. These variables will be equal to one another. We cannot create multiple None objects but can assign it to variables. It is an object of its own datatype, the NoneType. None is a special constant in Python that represents the absence of a value or a null value. This can be justified with the following example: > True = 1 True and False in python is same as 1 and 0. Here we can see that the first three statements are true so the interpreter returns True and returns False for the remaining three statements. They are the results of comparison operations or logical (Boolean) operations in Python. True and False are truth values in Python. You can always get the list of keywords in your current version by typing the following in the prompt.ĭescription of Keywords in Python with examples True, False Some extra might get added or some might be removed. The above keywords may get altered in different versions of Python. Here's a list of all keywords in Python Programming Keywords in Python programming language False We cannot use a keyword as a variable name, function name or any other identifier. Keywords are the reserved words in Python.