import mathĬomparison operators are applied to comparable objects and they return a Boolean value ( True or False). The result is False because the value is, indeed, not a number. The following code shows an example where we first create a NaN float value using the float('nan') built-in method, and then checking that number using math.isnan(x). To check whether a number x is not equal to NaN, use the not math.isnan(x) expression that returns True if the number x is not NaN, and False otherwise. Here are both semantically-identical methods: x = 42 In a Boolean context such as an if condition environment, you can also use the expression if x: instead of if x != 0: because Python implicitly transforms each 0 value into a Boolean False, and each other value into True. To check if a variable x is not equal to the value 0, use the expression x != 0. The output is: Yay! Python Not Equal to 0 If so, it prints 'Yay!' to the shell: negatives = You then check if a query string 'Alice' is not equal to the elements stored in the list negatives. The following example creates a list of three values and stores it in the variable negatives. If the variables are not equal, it will print TRUE and if the variables are equal, it will print FALSE. can also be written <>, but this is an obsolete usage kept for backwards compatibility only. The not equal operator can be used to compare variables.There is no difference between the two, but is the preferred form. For example, the expression 'Alice' not in returns True if the string 'Alice' is not in the given list, and False otherwise. Python 2 supports both, in python 3 the <> operator has been removed.To check whether a variable is not equal to multiple values given in a list, use the not in membership operator. The Python not equal operator is written as and returns a boolean value evaluating if the expressions are not equal. How to check that a variable is not equal to multiple variables? But the result of alice != carl evaluates to False as both have the same age. In the following code, you check if a Person is not equal to another Person by using the age attribute as a decision criterion: class Person:īecause Alice is 18 years old and Bob is 19 years old, the result of alice != bob is True. The return value is a Boolean True or False. Use attributes of the custom objects to determine if an object is not equal to another. To use the not equal to operator on custom objects, define the _ne_() “dunder” magic method that takes two arguments: self and other. The list not equal to operator iterates over the lists and checks pairwise if the i-th element of the left operand is different to the i-th element of the right operand.Ĭan you use the not equal to operator on custom objects? Yes! Python Not Equal to on Custom Objects What about 'h' not equal to 'h'? > 'h' != 'h'Ĭan you compare collections such as lists, strings, tuples? > != Let’s explore a couple of examples regarding the not equal to operator.
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