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Data Types in Python

bookBoolean Basics

Every decision your program makes - whether to show a message, repeat a step, or validate input - relies on a Boolean: True or False. Learn how Booleans work and how regular Python values behave in conditional expressions.

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".


              
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profile_complete = True
user_name = ""
messages_sent = 0

if profile_complete:
    print("Welcome to your dashboard!")  # Printed because profile is complete

print(bool(user_name))     # False β†’ no name provided yet
print(bool(messages_sent)) # False β†’ user hasn't sent any messages
print(bool("ok"))          # True  β†’ any non-empty string counts as valid input
copy

1. Which value is falsey in Python?

2. What value will this code output?

3. Which if will not execute its body?

question mark

Which value is falsey in Python?

Select the correct answer

question mark

What value will this code output?

Select the correct answer

question mark

Which if will not execute its body?

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 2. ChapterΒ 1

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bookBoolean Basics

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Every decision your program makes - whether to show a message, repeat a step, or validate input - relies on a Boolean: True or False. Learn how Booleans work and how regular Python values behave in conditional expressions.

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".


              
1234567891011

            
profile_complete = True
user_name = ""
messages_sent = 0

if profile_complete:
    print("Welcome to your dashboard!")  # Printed because profile is complete

print(bool(user_name))     # False β†’ no name provided yet
print(bool(messages_sent)) # False β†’ user hasn't sent any messages
print(bool("ok"))          # True  β†’ any non-empty string counts as valid input
copy

1. Which value is falsey in Python?

2. What value will this code output?

3. Which if will not execute its body?

question mark

Which value is falsey in Python?

Select the correct answer

question mark

What value will this code output?

Select the correct answer

question mark

Which if will not execute its body?

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 2. ChapterΒ 1
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