[Tut] How to Convert Bool (True/False) to a String in Python?

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How to Convert Bool (True/False) to a String in Python?

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Question: Given a Boolean value

Code:

True

or

Code:

False

. How to convert it to a string

Code:

"True"

or

Code:

"False"

in Python?

Note that this tutorial doesn’t concern “concatenating a Boolean to a string”. If you want to do this, check out our in-depth article on the Finxter blog.

Simple Bool to String Conversion

To convert a given Boolean value to a string in Python, use the

Code:

str(boolean)

function and pass the Boolean value into it. This converts Boolean

Code:

True

to string

Code:

"True"

and Boolean

Code:

False

to string

Code:

"False"

.

Here’s a minimal example:

Code:

>>> str(True) 'True' >>> str(False) 'False'

Python Boolean Type is Integer

Booleans are represented by integers in Python, i.e.,

Code:

bool

is a subclass of

Code:

int

. Boolean value

Code:

True

is represented with integer

Code:

1

. And Boolean value

Code:

False

is represented with integer .

Here’s a minimal example:

Code:

>>> True == 1 True >>> False == 0 True

Convert True to ‘1’ and False to ‘0’

To convert a Boolean value to a string

Code:

'1'

or

Code:

'0'

, use the expression

Code:

str(int(boolean))

. For instance,

Code:

str(int(True))

returns

Code:

'1'

and

Code:

str(int(False))

returns

Code:

'0'

. This is because of Python’s use of integers to represent Boolean values.

Here’s a minimal example:

Code:

>>> str(int(True)) '1' >>> str(int(False)) '0'

Convert List of Boolean to List of Strings

To convert a Boolean to a string list, use the list comprehension expression

Code:

[str(x) for x in my_bools]

assuming the Boolean list is stored in variable

Code:

my_bools

. This converts each Boolean

Code:

x

to a string using the built-in

Code:

str()

function and repeats it for all

Code:

x

in the Boolean list.

Here’s a simple example:

Code:

my_bools = [True, True, False, False, True] my_strings = [str(x) for x in my_bools] print(my_strings) # ['True', 'True', 'False', 'False', 'True']

Convert String Back to Boolean

What if you want to convert the string representation

Code:

'True'

and

Code:

'False'

(or:

Code:

'1'

and

Code:

'0'

) back to the Boolean representation

Code:

True

and

Code:

False

?

Recommended Tutorial: String to Boolean Conversion

Here’s the short summary:

You can convert a string value

Code:

s

to a Boolean value using the Python function

Code:

bool(s)

.

For example,

Code:

bool('True')

and

Code:

bool('1')

return

Code:

True

.

However,

Code:

bool('False')

and

Code:

bool('0')

return

Code:

False

as well which may come unexpected to you.

This is because all Python objects are “truthy”, i.e., they have an associated Boolean value. As a rule of thumb: empty values return Boolean

Code:

True

and non-empty values return Boolean

Code:

False

. So, only

Code:

bool('')

on the empty string

Code:

''

returns

Code:

False

. All other strings return

Code:

True

!

You can see this in the following example:

Code:

>>> bool('True') True >>> bool('1') True >>> bool('2') True >>> bool('False') True >>> bool('0') True >>> bool('') False

Okay, what to do about it?

Easy – first pass the string into the

Code:

eval()

function and then pass the result into the

Code:

bool()

function. In other words, the expression

Code:

bool(eval(my_string))

converts a string to a Boolean mapping

Code:

'True'

and

Code:

'1'

to Boolean

Code:

True

and

Code:

'False'

and

Code:

'0'

to Boolean

Code:

False

.

Finally – this behavior is as expected by many coders just starting out.

Here’s an example:

Code:

>>> bool(eval('False')) False >>> bool(eval('0')) False >>> bool(eval('True')) True >>> bool(eval('1')) True

Feel free to go over our detailed guide on the function:

Recommended Tutorial: Python

Code:

eval()

deep dive