Boolean Basics
Every decision your program makes—whether to show a message, repeat a step, or validate input—boils down to a Boolean: True or False. This chapter introduces Booleans and how ordinary Python values behave in conditions.
What is a Boolean?
A Boolean is a value that represents truth: True or False (note the capitalization). You'll often get Booleans from comparisons—age >= 18 yields True when the condition holds—and you'll use them directly in control flow, e.g. if is_adult:.
Truthiness in practice
In if/while conditions, Python treats many objects as "truthy" or "falsey". Empty or zero-like values are considered false; everything else is true. This lets you write natural checks such as if items: or if name: without extra comparisons.
Common falsey values
False;None;0,0.0;""(empty string);- Empty containers:
[],(),{},set().
Non-empty strings are truthy—even "0" or "False".
12345678910is_ready = True name = "" count = 0 if is_ready: print("Go!") # runs, because True print(bool(name)) # False → empty string print(bool(count)) # False → zero print(bool("0")) # True → non-empty string
1. Which value is falsey in Python?
2. What value will this code output?
3. Which if will not execute its body?
Bedankt voor je feedback!
Vraag AI
Vraag AI
Vraag wat u wilt of probeer een van de voorgestelde vragen om onze chat te starten.
Awesome!
Completion rate improved to 5Boolean Basics
Veeg om het menu te tonen
Every decision your program makes—whether to show a message, repeat a step, or validate input—boils down to a Boolean: True or False. This chapter introduces Booleans and how ordinary Python values behave in conditions.
What is a Boolean?
A Boolean is a value that represents truth: True or False (note the capitalization). You'll often get Booleans from comparisons—age >= 18 yields True when the condition holds—and you'll use them directly in control flow, e.g. if is_adult:.
Truthiness in practice
In if/while conditions, Python treats many objects as "truthy" or "falsey". Empty or zero-like values are considered false; everything else is true. This lets you write natural checks such as if items: or if name: without extra comparisons.
Common falsey values
False;None;0,0.0;""(empty string);- Empty containers:
[],(),{},set().
Non-empty strings are truthy—even "0" or "False".
12345678910is_ready = True name = "" count = 0 if is_ready: print("Go!") # runs, because True print(bool(name)) # False → empty string print(bool(count)) # False → zero print(bool("0")) # True → non-empty string
1. Which value is falsey in Python?
2. What value will this code output?
3. Which if will not execute its body?
Bedankt voor je feedback!
