3 min read•june 24, 2024
Boolean values are the backbone of decision-making in programming. They represent states, allowing programs to make choices based on conditions. This fundamental concept enables developers to create dynamic, responsive code that adapts to different scenarios.
Comparison operators work hand-in-hand with Boolean values. These tools let programmers craft complex conditions, evaluate data, and control program flow. Understanding how to use and manipulate Boolean values is key to writing efficient, logical code.
True
and False
[if](https://www.fiveableKeyTerm:If)
, [elif](https://www.fiveableKeyTerm:elif)
, [else](https://www.fiveableKeyTerm:Else)
)True
or False
using comparison operators (==, , <, , , ) and logical operators (and, or, )True
or False
and are declared using the [bool](https://www.fiveableKeyTerm:bool)
data type in Pythonis_logged_in = True
to indicate that a user is logged inis_valid = True
if user input meets validation criteria, otherwise is_valid = False
game_over = True
when the player's health reaches zero or they complete the final level==
(equal to), !=
(not equal to), <
(less than), >
(greater than), <=
(less than or equal to), >=
(greater than or equal to)5 > 3
, 2.5 <= 2.7
"hello" == "hello"
, "apple" != "banana"
True == True
, False != True
if score >= 60: print("Pass")
to check if a student's score is greater than or equal to the passing thresholdif username == "admin" and password == "secret": grant_access()
to authenticate a user's credentials[int](https://www.fiveableKeyTerm:int)(True)
returns 1
, int(False)
returns 0
[float](https://www.fiveableKeyTerm:Float)(True)
returns 1.0
, float(False)
returns 0.0
[str](https://www.fiveableKeyTerm:str)(True)
returns "True"
, str(False)
returns "False"
[bool()](https://www.fiveableKeyTerm:bool())
function
bool(0)
, bool(0.0)
, bool("")
, bool([])
, bool({})
, and bool(None)
return False
True
if bool(username): ...
to check if the username is not an empty stringif bool(items): ...
to check if a list or dictionary has any elementsand
, or
, not
) are used to combine or negate Boolean values
and
returns True
if both operands are True
, otherwise False
or
returns True
if at least one operand is True
, otherwise False
not
returns the opposite Boolean value of its operandif age >= 18 and is_student: apply_discount()
to check if a customer is both an adult and a student to apply a discountif not is_valid: display_error_message()
to execute code when a condition is not metif (x > 0) or (y < 0 and z == 0): handle_special_case()
to prioritize the evaluation of certain conditions over others