Python Snippets

Useful Python code snippets for common programming tasks

List Comprehension

python

Create lists using concise list comprehension syntax

numbers = [1, 2, 3, 4, 5]
squares = [x**2 for x in numbers if x % 2 == 0]
# Result: [4, 16]

Context Manager

python

Safe file handling with context manager

with open('file.txt', 'r') as file:
    content = file.read()
    # File is automatically closed after this block

Decorators

python

Function decorators for code reuse

def timer(func):
    def wrapper(*args, **kwargs):
        import time
        start = time.time()
        result = func(*args, **kwargs)
        end = time.time()
        print(f'{func.__name__} took {end-start} seconds')
        return result
    return wrapper

@timer
def slow_function():
    time.sleep(1)
    return 'Done!'

Generator Function

python

Memory efficient iteration with generators

def fibonacci(n):
    a, b = 0, 1
    for _ in range(n):
        yield a
        a, b = b, a + b

# Use the generator
for num in fibonacci(5):
    print(num)
# Output: 0, 1, 1, 2, 3