Instead of writing methods without return values, make them return self
# Instead of this
self.release_water()
self.shutdown()
self.alarm()
class Reactor:
...
def release_water(self):
self.valve.open()
return self
self.release_water().shutdown().alarm()
Enumeration (iteration) method
# Bad
# Can't change type of collection
# e.g. can't change employees from a list to a set
class Department:
def __init__(self, *employees):
self.employees = employees
for employee in department.employees:
...
# Better
class Department:
def __init__(self, *employees):
self._employees = employees
def __iter__(self):
return iter(self._employees)
for employee in department: # More readable, more composable
Оригинал старьи
