bool
- Python course
- Beginner
- Lesson 14/116
- 3 min
Learn True/False values with bool.
The bool type
bool is a logical type with only two values: True and False. These values are the basis of comparisons and conditions.
is_active = True
is_admin = Falsebool is actually a special case of int: True = 1, False = 0. So True + True gives 2.
bool values are used in decisions with if and while. Comparison operators (==, <, >) return bool.
Truthy and falsy values
Python evaluates every value as if it were bool. Falsy values: 0, 0.0, , [], None. Everything else is truthy.
if 0:
print("This will not run")
if "text":
print("This will run")This behavior is handy with if and while: to say "if not empty" just write if text:.
Practice Print bool variables
Assign True to is_active, assign False to is_admin. Then print print(is_active, is_admin).
Starter code
# Define the bool variablesSample solution
is_active = True
is_admin = False
print(is_active, is_admin)Expected output
True False
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 Define the active variable
is_active = ____is_active = TrueExplanation: is_active = True assigns a bool.
2 What does this code print?
print(True + True)- True
- 1
- It raises an error
- 2 Correct answer
Explanation: Since True = 1, True + True = 2.
3 Match the values
| Term | Meaning |
|---|---|
True |
True-like |
False |
False-like |
0 |
Falsy |
"text" |
Truthy |