# Deleting a variable
x = 10
print(x) # Output: 10
del x
# print(x) # This line will cause an error because x has been deleted

# Deleting an element from a list by its index
my_list = [1, 2, 3, 4, 5]
del my_list[2]
print(my_list) # Output: [1, 2, 4, 5]

# Deleting a slice from a list
my_list = [1, 2, 3, 4, 5]
del my_list[1:3]
print(my_list) # Output: [1, 4, 5]

# Deleting an attribute from an object
class MyClass:
def init(self):
self.attr1 = "value1"
self.attr2 = "value2"

obj = MyClass()
print(obj.attr1) # Output: value1
del obj.attr1
# print(obj.attr1) # This line will cause an error because attr1 has been deleted

# Using 'with' statement to open and automatically close a file
with open('example.txt', 'w') as file:
file.write('Hello, World!')

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

class Person:
def init(self, name, age):
self.name = name
self.age = age

# Creating an instance of the Person class
person1 = Person("Alice", 30)

# Accessing the initialized attributes
print("Name:", person1.name) # Output: Alice
print("Age:", person1.age) # Output: 30

class Point:
def init(self, x, y):
self.x = x
self.y = y

def str(self):
return f"Point({self.x}, {self.y})"

# Creating an instance of the Point class
p = Point(3, 4)

# Printing the instance as a string
print(str(p)) # Output: Point(3, 4)

class Team:
def init(self, members):
self.members = members

def len(self):
return len(self.members)

# Creating an instance of the Team class
team = Team(['Alice', 'Bob', 'Charlie', 'David'])

# Using the len() function on the instance
print(len(team)) # Output: 4

class Circle:
def init(self, radius):
self._radius = radius

@property
def radius(self):
"""Getter method for radius."""
return self._radius

@radius.setter
def radius(self, value):
"""Setter method for radius."""
if value <= 0:
raise ValueError("Radius must be positive")
self._radius = value

@property
def area(self):
"""Compute the area of the circle."""
return 3.14 * self._radius * self._radius

# Creating an instance of the Circle class
circle = Circle(5)

# Accessing the radius attribute using the property
print(circle.radius) # Output: 5

# Setting a new radius using the property
circle.radius = 7
print(circle.radius) # Output: 7

# Trying to set an invalid radius (should raise an error)
circle.radius = -2 # Raises ValueError: Radius must be positive

# Accessing the area attribute using the property
print(circle.area) # Output: 153.86