Cheet Sheet – Python 🐍

I am sure you can find cheet sheets about python from many sources but I hope that having all the examples and exercises in one place will be useful for you. 🌍

Your feedback is very valuable to me, I am looking forward to hearing it. 👋🏼

Basics

Syntax	Description
print("Hello, World!")	Prints output to the console.
# Comment	Single-line comment.
""" Multi-line """	Multi-line comment or docstring.
x = 10	Variable assignment.
type(x)	Returns the type of a variable.

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Data Types

Data Type	Example
Integer	x = 5
Float	y = 3.14
String	name = "Alice"
Boolean	is_active = True
List	lst = [1, 2, 3]
Tuple	tup = (1, 2, 3)
Dictionary	d = {"key": "value"}
Set	s = {1, 2, 3}

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Control Flow

Syntax	Description
if x > 0:	Conditional statement.
elif x == 0:	Else if condition.
else:	Executes if none of the above conditions are met.
for i in range(5):	For loop from 0 to 4.
while x < 10:	While loop.
break	Exits the loop.
continue	Skips to the next iteration.

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Functions

Syntax	Description
def greet(name):	Defines a function.
return f"Hello, {name}!"	Returns a value.
lambda x: x * 2	Lambda (anonymous) function.

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String Operations

Operation	Example
Concatenation	"Hello" + " World"
Repetition	"Hi" * 3
Slicing	"Python"[0:3] → 'Pyt'
Methods	"hello".upper() → 'HELLO'
Format Strings	f"My age is {age}"

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List Operations

Operation	Example
Access Element	lst[0]
Append	lst.append(4)
Remove	lst.remove(2)
Slice	lst[1:3]
Sort	lst.sort()

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Dictionary Operations

Operation	Example
Access Value	d["key"]
Add/Update Key	d["new_key"] = "value"
Keys	d.keys()
Values	d.values()
Items	d.items()

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File Handling

Syntax	Description
with open("file.txt", "r") as file:	Open a file in read mode.
content = file.read()	Read entire file content.
file.write("Hello!")	Write to a file.

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Exception Handling

Syntax	Description
try:	Start a try block.
except Exception as e:	Catch an exception.
else:	Execute if no exception occurs.
finally:	Always execute.

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Classes

Syntax	Description
class Person:	Define a class.
def __init__(self, name):	Constructor.
def greet(self):	Instance method.

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Common Modules

Module	Example
import math	Import math module.
math.sqrt(16)	Square root → 4.0.
import random	Random module.
random.randint(1, 10)	Random integer between 1 and 10.
import datetime	Datetime module.
datetime.datetime.now()	Current date and time.

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