[Tut] Python bool() Function

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Python bool() Function

Python’s built-in

Code:

bool(x)

function converts value

Code:

x

to a Boolean value

Code:

True

or

Code:

False

. It uses implicit Boolean conversion on the input argument

Code:

x

. Any Python object has an associated truth value. The

Code:

bool(x)

function takes only one argument, the object for which a Boolean value is desired.



Argument |

Code:

x

|
A Python object for which a Boolean value should be determined. Any Python object has an associated Boolean defined by the method

Code:

object.__bool__()

.

Return Value |

Code:

True, False

|
Returns a Boolean value associated to the argument

Code:

x

. The object will always return

Code:

True

, unless:
 The object is empty, like

Code:

[]

,

Code:

()

,

Code:

{}

The object is

Code:

False

The object is or

Code:

0.0

The object is

Code:

None

Code:

Input : bool(1) Output : True Input : bool(0) Output : False Input : bool(True) Output : True Input : bool([1, 2, 3]) Output : True Input : bool([]) Output : False

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Examples bool() Functions

The following code shows you how to use the

Code:

bool(x)

function on different input arguments that all lead to

Code:

True

results.

Code:

##################### # True Boolean Values ##################### # All integers except 0 print(bool(1)) print(bool(2)) print(bool(42)) print(bool(-1)) # All collections except empty ones # (lists, tuples, sets) print(bool([1, 2])) print(bool([-1])) print(bool((-1, -2))) print(bool({1, 2, 3})) # All floats except 0.0 print(bool(0.1)) print(bool(0.0000001)) print(bool(3.4)) # Output is True for all previous examples

The following list of executions of the function

Code:

bool(x)

all result in Boolean values of

Code:

False

.

Code:

##################### # False Boolean Values ##################### # Integer 0 print(bool(0)) # Empty collections # (lists, tuples, sets) print(bool([])) print(bool({})) print(bool(())) # Float 0.0 print(bool(0.0)) # Output is False for all previous examples

You can observe multiple properties of the

Code:

bool()

function:

• You can pass any object into it and it will always return a Boolean value because all Python objects implement the
  Code:

  __bool__()
  method and have an associated implicit Boolean value. You can use them to test a condition:
  Code:

  0 if x else 1
  (example ternary operator).
  
  
• The vast majority of objects are converted to
  Code:

  True
  . Semantically, this means that they’re non-empty or whole.
  
  
• A minority of objects convert to
  Code:

  False
  . These are the “empty” values—for example, empty lists, empty sets, empty tuples, or an empty number 0.
  

Summary

Python’s built-in

Code:

bool(x)

function converts value

Code:

x

to a Boolean value

Code:

True

or

Code:

False

.

It uses implicit Boolean conversion on the input argument

Code:

x

.

Any Python object has an associated truth value.

The

Code:

bool(x)

function takes only one argument, the object for which a Boolean value is desired.

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