Welcome back to our ongoing series of blog posts on basic data types in Python 3! Last time, we explored the functionality of strings. Today, we dive in to another key data type - booleans. Booleans (and "boolean logic") are an important concept in programming, representing the concept of "true" and "false".
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Ready to learn how to use booleans in Python 3? Let's get started!
Booleans are a concept that exists in every programming language. A boolean represents the idea of "true" or "false". When you are writing a program, there are often circumstances where you want to execute different code in different situations. Booleans enable our code to do just that.
You can declare a boolean value in your code using the keywords
False (note the uppercase). The following code would create two boolean
values and assign them to variables.
mullet_looks_good = False python_is_fun = True
More commonly, a boolean value is returned as a result of some kind of
comparison. The following code example would store a boolean value of
have_same_name variable after using the
equality comparison operator,
my_name = "Wammu" your_name = "Kars" have_same_name = my_name == your_name
Booleans are used in your code to make it behave differently based on current
conditions within your program. You can use boolean values and comparisons in
conjunction with the
else keyoards as one means to achieve
my_age = 10 if my_age >= 100: print("One hundred years old! Very impressive.") elif my_age <= 3: print("Awwww. Just a baby.") else: print("Ah - a very fine age indeed")
In addition to testing for truth, you can also check if conditions are not
true using the
favorite_team = "Vikings" if not favorite_team == "Vikings": print("Oh - how unfortunate.") else: print("Skol, Vikings!")
Sometimes you will need to evaluate multiple conditions in your boolean logic.
For this purpose, you'll combine the
or keywords. The
compares two boolean values and returns
True if both are true. The
compares two values and returns
True if any of the statements are true.
Let's look at an example. That uses the
in keyword to see if a string is
inside a list of values (we'll cover lists in a future article).
favs = ["Donatello", "Raphael"] if "Michelangelo" in favs and "Donatello" in favs: print("Those are my favorite ninja turtles too!") elif "Michelangelo" in favs or "Donatello" in favs: print("Well, one out of two isn't bad...") else: print("Huh - not what I would have chosen.")
Booleans are an important tool in any programming language. Using boolean logic, your code can react to data inside your program, and carry out different instructions under different circumstances. Hopefully, you've learned a bit about how to work with booleans in Python 3! Stay tuned for more blog posts in this series to learn more about basic data types like strings, numbers, booleans, lists, and dictionaries.
Also, be sure to download and play TwilioQuest 3 to learn even more about Python!