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

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

+- Sick Gaming (https://sickgaming.net)
+-- Forum: Programming (https://sickgaming.net/forum-76.html)
+--- Forum: Python (https://sickgaming.net/forum-83.html)
+--- Thread: [Tut] How to Convert Bool (True/False) to a String in Python? (/thread-100023.html)

[Tut] How to Convert Bool (True/False) to a String in Python? - xSicKxBot - 10-04-2022

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

5/5 – (1 vote)

Question: Given a Boolean value

Code:
True

Code:
False

. How to convert it to a string

Code:
"True"

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'

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: