Python Boolean Type
Python Booleans
Booleans in Python represent one of two values: True
or False
. Booleans are useful in decision-making, conditions, and logic control, allowing programs to make comparisons and evaluate expressions.
Python Boolean Values
In Python, you often need to determine if an expression is True
or False
. Any comparison or logical statement results in a Boolean value.
Example: Boolean Comparisons
When comparing two values, Python evaluates the expression and returns either True
or False
:
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print(10 > 9) # True print(10 == 9) # False print(10 < 9) # False
Evaluating Values and Variables
The bool()
function can evaluate any value or variable to determine if it is True
or False
.
Example: Evaluating Strings and Numbers
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print(bool("Hello")) # True print(bool(15)) # True
Example: Evaluating Variables
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x = "Hello" y = 15 print(bool(x)) # True print(bool(y)) # True
Most Values are True
In Python, almost any value will evaluate to True
if it contains data or content.
- Non-empty strings are
True
. - Non-zero numbers are
True
. - Non-empty lists, tuples, sets, and dictionaries are
True
.
Example: Values that return True
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print(bool("abc")) # True print(bool(123)) # True print(bool(["apple", "cherry", "banana"])) # True
Values that are False
Some specific values evaluate to False
in Python:
False
None
0
(zero)- Empty sequences like
""
,()
,[]
, and empty collections like{}
(empty dictionary).
Example: Values that return False
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print(bool(False)) # False print(bool(None)) # False print(bool(0)) # False print(bool("")) # False print(bool(())) # False print(bool([])) # False print(bool({})) # False
Key Takeaways
- Booleans are used to evaluate expressions and control the flow of logic in Python.
- Values like non-empty strings, non-zero numbers, and non-empty collections evaluate to
True
, whileFalse
,None
,0
, and empty collections evaluate toFalse
. - You can use the
bool()
function to evaluate any value and determine its truthiness.
Frequently Asked Questions
In Python, Boolean is a data type that represents one of two values: True or False. It is used to store truth values and is commonly used in conditional statements and loops.
The == operator in Python is not a Boolean operator but a comparison operator. It checks whether two values are equal and returns a Boolean result: True if the values are equal, and False if they are not.
In Python, True is considered equivalent to 1 when used in a numeric context, but they are not the same. True is a Boolean value, while 1 is an integer. Therefore, True == 1 evaluates to True, but they are not the same object.
The -> bool syntax is used in Python type hinting to indicate that a function will return a Boolean value (True or False). It is used to provide better clarity in function definitions for the expected return type.
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