How to perform 'not None' test in Python?

├Źndice
  1. Introduction
  2. Using the 'is not' operator
  3. Using the 'not' operator
  4. Conclusion

Introduction

When working with Python, it's common to encounter situations where you need to check if a variable or object is not None. In this article, we'll go over the different ways you can perform a 'not None' test in Python.

Using the 'is not' operator

The most common way to perform a 'not None' test in Python is by using the 'is not' operator. This operator returns True if the two operands are not equal and not of the same type. Here's an example:


x = None
if x is not None:
    print("x is not None")
else:
    print("x is None")

Output:


x is None

In this example, we check if the variable 'x' is not None using the 'is not' operator. Since 'x' is None, the condition is False and the else block is executed.

Using the 'not' operator

You can also use the 'not' operator to perform a 'not None' test in Python. The 'not' operator returns True if the operand is False, and False if the operand is True. Here's an example:


x = None
if not x:
    print("x is None")
else:
    print("x is not None")

Output:


x is None

In this example, we use the 'not' operator to check if the variable 'x' is None. Since 'x' is None, the condition is True and the if block is executed.

Conclusion

Performing a 'not None' test in Python is a common task when working with variables and objects. In this article, we went over the different ways you can perform this test using the 'is not' and 'not' operators. By using these operators, you can easily check if a variable or object is not None in your Python code.

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