# Declaring variables
name = "John"
age = 30
is_active = True

# Creating a list
numbers = [1, 2, 3, 4, 5]

# Appending to a list
numbers.append(6)

# Accessing list elements
first_number = numbers[0]  # 1

# Creating a dictionary
person = {"name": "John", "age": 30}

# Accessing dictionary values
name = person["name"]

# Adding new key-value pairs
person["city"] = "New York"

# For loop
for i in range(5):
    print(i)

# While loop
count = 0
while count < 5:
    print(count)
    count += 1

# If, elif, else
if age < 20:
    print("Teenager")
elif age < 60:
    print("Adult")
else:
    print("Senior")

# Defining a function
def greet(name):
    return "Hello " + name

# Calling a function
greeting = greet("John")
print(greeting)

# Writing to a file
with open('example.txt', 'w') as file:
    file.write('Hello, World!')

# Reading from a file
with open('example.txt', 'r') as file:
    content = file.read()
    print(content)

# Try, except block
try:
    result = 10 / 0
except ZeroDivisionError:
    print("Divided by zero!")

# Importing a module
import math

# Using a function from the math module
result = math.sqrt(16)  # 4.0