1000 Python programs PDF free download

1000 Python programs PDF free download

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Advanced python basics pdf

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Python is a versatile and popular programming language that has many features and tools for developers to use. Here are some advanced Python basics:

1. Decorators: Decorators allow you to wrap another function in order to extend the behavior of the wrapped function, without permanently modifying it. This allows you to keep the core functionality of your original function intact, but also adds extra functionality.

Example:

def my_decorator(func):
def wrapper():
print("Something is happening before the function is called.")
func()
print("Something is happening after the function is called.")
return wrapper
@my_decorator
def say_hello():
print("Hello!")
say_hello()  # Output: Something is happening before the function is called. Hello! Something is happening after the function is called.

2. Generators: Generators allow you to create iterators that can be used in a for loop or list comprehension.

Example:

def my_generator():
yield "Hello"
yield "World"
g = my_generator()
for item in g:
print(item)  # Output: Hello World

3. Lambda Functions: Lambda functions are small anonymous functions that can be defined inline and used as needed.

Example:

numbers = [1, 2, 3, 4, 5]
squared_numbers = list(map(lambda x: x ** 2, numbers))
print(squared_numbers)  # Output: [1, 4, 9, 16, 25]

4. Async and Await: Async and await allow you to write asynchronous code that can be used with the async and await keywords.

Example:

async def my_function():
print("Before sleeping...")
await asyncio.sleep(2)
print("After waking up...")
import asyncio
asyncio.run(my_function())  # Output: Before sleeping... After waking up...

5. Type Hints: Type hints allow you to specify the expected type of a function's arguments and return values.

Example:

def my_function(arg: str) -> None:
print(f"The argument is {arg}.")
my_function("Hello!")  # Output: The argument is Hello!

6. Context Managers: Context managers are objects that implement the __enter__ and __exit__ special methods.

Example:

class MyContextManager:
def init(self):
print("Entering the context...")
def enter(self):
return self
def exit(self, exc_type, exc_val, exc_tb):
print("Exiting the context...")
with MyContextManager():
print("Inside the context...")  # Output: Entering the context... Inside the context... Exiting the context...

7. Descriptors: Descriptors are objects that implement special methods to customize attribute access.

Example:

class MyDescriptor:
def init(self, name):
self.name = name
def get(self, instance, owner):
print(f"Getting {self.name} from the descriptor.")
def set(self, instance, value):
print(f"Setting {self.name} on the instance to {value}.")
class MyClass:
my_descriptor = MyDescriptor("my_attribute")
my_instance = MyClass()
my_instance.my_descriptor  # Output: Getting my_attribute from the descriptor.

These are just a few of the many advanced Python basics. With practice and experience, you can master these concepts and become proficient in using them to write efficient and effective code.

Please note that this is an English-only response as per the initial request.