
Python Cheatsheet for Beginners
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Python Cheatsheet for Beginners
1. Variables and Data Types
Python supports various data types such as strings, integers, floats, lists, etc.
# Example of variable assignment
name = "Alice"
age = 25
height = 5.6
is_student = True
my_list = [1, 2, 3, 4]
2. Basic Operators
Operators allow us to perform operations on variables and values.
# Arithmetic Operators
sum = 10 + 5 # Addition
difference = 10 - 5 # Subtraction
product = 10 * 5 # Multiplication
quotient = 10 / 5 # Division
# Comparison Operators
x = 5
y = 10
print(x == y) # Equal to
print(x != y) # Not equal to
print(x < y) # Less than
3. Conditional Statements
Conditional statements allow you to execute code based on certain conditions.
# If-else statement
age = 18
if age >= 18:
print("You are an adult.")
else:
print("You are a minor.")
4. Loops
Loops let you execute a block of code multiple times.
# For loop
for i in range(5): # Will print numbers 0 to 4
print(i)
# While loop
count = 0
while count < 5:
print(count)
count += 1 # Increment
5. Functions
Functions are reusable blocks of code that you can call with a name.
# Function definition
def greet(name):
return "Hello, " + name
# Function call
message = greet("Alice")
print(message) # Output: Hello, Alice
6. Lists
Lists are ordered collections of items in Python.
# List creation
fruits = ["apple", "banana", "cherry"]
# Accessing list elements
print(fruits[0]) # apple
# Adding an element to the list
fruits.append("orange")
# Removing an element from the list
fruits.remove("banana")
7. Dictionaries
Dictionaries store data in key-value pairs.
# Dictionary creation
person = {"name": "Alice", "age": 25, "city": "New York"}
# Accessing dictionary values
print(person["name"]) # Alice
# Adding a new key-value pair
person["job"] = "Engineer"
8. Importing Libraries
Python allows you to use additional libraries by importing them.