If I output condition_is_met, you can see that its value is False. Let's create a variable called condition_is_met and set it to 1 > 2. If needed, you can actually assign that result to a variable. Doing so will return the boolean value False. Instead, you'll find them as a result of evaluating conditions or other statements.įor example, I can write 1 2. When writing code, you'll rarely work with True and False values directly.
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#NameError: name 'true' is not defined How to Use Booleans for Evaluating Conditions and Statements #NameError Traceback (most recent call last) # If we don't create our boolean with a capital T or F, we get an error True with a capital T and False with a capital F are the only reserved Python keywords for boolean values. So remember, when assigning True or False boolean values, use capitalization. The Python interpreter thinks that this lowercase true is the name of a variable, but it can't find any variable by that name. If, for example, I write is_dec_31 = true, I get an error. One “gotcha” to be aware of is that boolean values in Python need to be capitalized. # This still returns bool, so we still have a boolean. I can again check the data type by running type(is_dec_31), and I get bool again. # When we run this, we will get bool as the outputīut what if today is not December 31? In that case, I can make is_dec_31 = False. If I check the data type of this variable using type(is_dec_31), I get bool, which is short in Python for boolean.
In this case, I can type is_dec_31 = True. I want this variable to store True if the day is indeed December 31 and False otherwise. Let's create a variable called is_dec_31. You'll see exactly how that's possible in upcoming articles, but for now, that's all you need to remember. So, you can already see that booleans are essential when you want to execute a part of our program only when a certain condition is True or False.
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How Booleans Are Used as True or False Values in Python Code The computer can “decide,” for example, to show you a “Happy New Year” message if the statement value is true or show you no message at all if it's False.
Second, you would assign this statement a value of True.īecause you can assign a value of either True or False to this statement, a computer can also evaluate it and make a decision based on that statement’s value. If today is indeed December 31-first of all, I admire your dedication. By allowing you to assign objects, statements, conditions, or other items a value of true or false, booleans make it possible to execute different parts of a given program by an object’s assigned true or false value.įor example, let's consider the statement “today is December 31.” Depending on when you're reading this post, this statement is either True or False. In computer programming, you're more concerned with its applications, and you'll see them more and more as you progress with this course.Īs you might have guessed, booleans help computers understand logic. However, I won't go much deeper into the theory behind it. Though simple on the surface, Boolean algebra can be very powerful.
In Boolean algebra, True and False are often represented by the numbers 1 and 0, respectively. If you're not familiar with Boolean algebra, it's a branch of math that operates not with numbers but with just two values: True and False. Boole introduced Boolean algebra in his 1847 book entitled The Mathematical Analysis of Logic. Booleans are really important for writing computer logic, and they're used to convey whether something (a statement, a variable, a condition, or others) is either True or False.īooleans got their name from an English gentleman named George Boole. Intro to Programming: Why Beginners Should Start With Pythonīy definition, a boolean is a data type that can have one of only two possible values: True or False.Today I'll talk about booleans, comparison operators, and logical operators in Python. Welcome back to our Intro to Programming series. A Note on How to Use Parentheses with Boolean Variables in Python.How to Use Logical Operators in Python Code.How to Use the Comparison Operator Equal to or =.How to Use Comparison Operator Less Than or.How to Use Booleans for Evaluating Conditions and Statements.How Booleans Are Used as True or False Values in Python Code.
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