Python, the good parts

good.py

# string format with kwargs
user = {
    'first_name': 'John',
    'last_name': 'Doe',
    'email': 'j.doe@example.com',
}
user_bio = '{first_name} is registered with email: {email}'.format(**user)

# string format with an object
class User(object):
    """A lightweight user model"""
    
    def __init__(self, first_name, last_name, email):
        self.first_name = first_name
        self.last_name = last_name
        self.email = email

user = User('John', 'Doe', 'j.doe@example.com')

user_bio = '{user.first_name} is registered with email: {user.email}'.format(user=user)

    
# context managers
"""Say you want to time something like this in the shell:

    In [8]: with Timer('user count'):
            ...:     User.objects.count()
            ...:
            user count: 0.00135397911072


Well, to accomplish this we simply need a python class, Timer, with __enter__ and __exit__ methods.
"""
import time

class Timer(object):
    """my timer context manager
    Mostly borrowed from http://rustyrazorblade.com/2016/02/async-python-and-cassandra-with-gevent/
    """

    def __init__(self, name):
        self.name = name

    def __enter__(self):
        self.start = time.time()

    def __exit__(self, *args):
        self.end = time.time()
        self.interval = self.end - self.start
        print('{timer.name}: {timer.interval}'.format(timer=self))