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Writing Functions in Python

Shayne Miel

Software Architect @ Duo Security

Chapter 1 - Best Practices

Docstrings
DRY and Do One Thing
Pass by assignment (mutable vs immutable)

Chapter 2 - Context Managers

with my_context_manager() as value:
  # do something

@contextlib.contextmanager
def my_function():
  # this function can be used in a "with" statement now

Chapter 3 - Decorators

@my_decorator
def my_decorated_function():
  # do something

def my_decorator(func):
  def wrapper(*ars, **kwargs):
    return func(*args, **kwargs)
  return wrapper

Chapter 4 - More on Decorators

def my_decorator(func):
  @functools.wraps(func)
  def wrapper(*ars, **kwargs):
    return func(*args, **kwargs)
  return wrapper

Chapter 4 - More on Decorators

def decorator_that_takes_args(a, b, c):
  def decorator(func):
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
      return func(*args, **kwargs)
    return wrapper
  return decorator

Thank you!

Writing Functions in Python