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Python - Reserved Words

📌 What You Will Learn

Know what reserved words are in Python
Understand why you cannot use them as identifiers
Learn all 35 Python reserved words

In Python, some words have a predefined meaning.

These words are called Reserved Words or Keywords.

Python uses these keywords for specific programming tasks, so they cannot be used as identifiers.

You cannot use reserved words as:

Variable names
Function names
Class names
Module names
Other identifiers

Python 3.14 contains 35 reserved words (keywords).

Python also provides four soft keywords:

match
case
_
type

Soft keywords behave like keywords only in specific situations and are not included in the reserved keyword list.

Reserved Words
True, False, None
and, or, not, is
if, elif, else
while, for, break, continue, return
in, yield
try, except, finally, raise, assert
import, from, as
class, def, pass, lambda
global, nonlocal
del, with
async, await

True and False represent Boolean values.

🐍Code Cell

1	a = True
2	b = False
3
4	print(a)
5	print(b)

Output

True
False

None represents the absence of a value.

🐍Code Cell

1	x = None
2
3	print(x)

Output

None

The keywords and, or, not, and is are used in logical expressions.

🐍Code Cell

1	a = True
2	b = False
3
4	print(a and b)
5	print(a or b)
6	print(not a)

Output

False
True
False

The keywords if, elif, and else are used for decision making.

🐍Code Cell

1	age = 18
2
3	if age >= 18:
4	print("Eligible")
5	else:
6	print("Not Eligible")

Output

Eligible

The keywords for, while, break, continue, return, in, and yield are used in loops and iteration.

🐍Code Cell

1	for i in range(5):
2	print(i)

Output

Python provides keywords to handle runtime errors.

🐍Code Cell

1	try:
2	print(10 / 0)
3	except ZeroDivisionError:
4	print("Cannot divide by zero")

Output

Cannot divide by zero

The keywords import, from, and as are used to import modules.

🐍Code Cell

1	import math
2
3	print(math.sqrt(16))

Output

4.0

The keywords async and await are used for asynchronous programming.

🐍Code Cell

1	import asyncio
2
3	async def greet():
4	print("Hello")
5
6	asyncio.run(greet())

Output

Hello

The keywords class, def, pass, and lambda are used in object-oriented programming and function definitions.

🐍Code Cell

1	def display():
2	pass

Output

Function created successfully.

The keywords global and nonlocal control variable scope.

🐍Code Cell

1	x = 10
2
3	def test():
4	global x
5	x = 20
6
7	test()
8
9	print(x)

Output

The del keyword is used to delete variables or objects.

🐍Code Cell

1	a = 10
2
3	del a

Output

Variable deleted.

The with keyword is used for resource management, such as working with files.

🐍Code Cell

1	with open("test.txt") as file:
2	print(file.read())

Output

Contents of the file are displayed.

All reserved words contain only alphabet characters.
True, False, and None begin with capital letters.
All other reserved words are written in lowercase.
async and await were introduced in Python 3.5.
match, case, _, and type are soft keywords.

Python provides the keyword module to display all reserved words.

🐍Code Cell

1	import keyword
2
3	print(keyword.kwlist)

Output

Displays the complete list of Python reserved words.

Reserved words cannot be used as identifiers.

🐍Code Cell

if = 100

Output

SyntaxError

Python 3.14 contains 35 reserved words.
Reserved words have predefined meanings.
They cannot be used as variable names or other identifiers.
True, False, and None start with capital letters.
Most other keywords are written in lowercase.
The keyword module displays the list of reserved words.

Category	Examples
Boolean Values	True, False
Special Value	None
Logical Operators	and, or, not, is
Conditional Statements	if, elif, else
Loops	for, while, break, continue
Exception Handling	try, except, finally, raise
Import	import, from, as
OOP & Functions	class, def, lambda, pass
Variable Scope	global, nonlocal
Others	del, with, async, await

📝 Key Takeaways

Reserved words have special meaning in Python
You cannot use them as variable names, function names, or class names
There are 35 reserved words in Python 3
Keywords like if, else, for, while, def, class are commonly used
Always check the official list when in doubt

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Nearby lessons

Python - Reserved Words

Introduction

Total Reserved Words

List of Python Reserved Words

1. Boolean Keywords

2. Special Value

3. Logical Keywords

4. Conditional Keywords

5. Looping Keywords

6. Exception Handling Keywords

7. Import Keywords

8. Asynchronous Programming Keywords

9. OOP and Function Keywords

10. Variable Scope Keywords

11. Delete Keyword

12. Context Management Keyword

Important Notes

Display All Reserved Words

Invalid Use of Reserved Words

Key Points

Quick Summary

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