Apr 3, 2015 · You shouldn't be using == True or == False either, unless you explicitly need to test against the boolean value (which you almost never don't). The preferred way to perform boolean tests in Python is if foo and if not foo.

If you want to check whether something is false, e.g. zero, opposite of True, do if something == False. As mentioned in the comments, you can certainly do if not something, it may improve readability quite a bit, but it's the same as if bool(something) == False.

Aug 15, 2012 · If the list really does contain booleans the only difference is that you get an int as the result instead of bool, but if it contains other values being used for their truth value you may get a completely different result. reduce(and_, [1, 2, 3]) --> 0, all((1,2,3)) --> True.

Booleans represent one of two values: True or False. In programming you often need to know if an expression is True or False. You can evaluate any expression in Python, and get one of two answers, True or False. When you compare two values, the expression is evaluated and Python returns the Boolean answer:

In this tutorial, you'll learn about the built-in Python Boolean data type, which is used to represent the truth value of an expression. You'll see how to use Booleans to compare values, check for identity and membership, and control the flow of your programs with conditionals.

The simplest and most common sort of boolean test uses == (two equal signs next to each other) to compare two values, and it's True if the two are the same. Here is an example that shows an if-statement inside a for-loop.

If you want to determine whether a value is exactly True (not just a true-like value), is there any reason to use if foo == True rather than if foo is True? If you want to make sure that foo really is a boolean and of value True, use the is operator.

Jun 8, 2022 · Here’s an interactive version of the same code that you can experiment with: First, we define a variable called door_is_locked and set it to True. Next, you’ll find an if-statement. This is a so-called conditional statement. It is followed by …

Jan 5, 2022 · We can check the boolean value of any Python object by using the bool() function. The function will return either a True or False value. Let’s take a look at a few samples and see if you can pick out some rhyme or reason behind this: print ("'' has a boolean value of: ", bool ('')) print ("0 has a boolean value of: ", bool (0))

Python provides several comparison operators that can be used to compare boolean values. ==: Checks if two values are equal. !=: Checks if two values are not equal. is: Checks if two variables refer to the same object in memory. is not: Checks if …