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?
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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?
Tack för dina kommentarer!
