pradeepvairamani

x = 'foo'
y = x
print x # foo
y += 'bar'
print x # foo

x = [1, 2, 3]
y = x
print x # [1, 2, 3]
y += [3, 2, 1]

pradeepvairamani

x = something # immutable type
print x
func(x)
print x # prints the same thing

x = something # mutable type
print x
func(x)
print x # might print something different

pradeepvairamani

#The @ symbol indicates that we are applying 
#the decorator to the function hello()
 
@timer
def hello():
    pass

pradeepvairamani

#The @ symbol indicates that we are applying the decorator to
#the function hello()
 
@timer
def hello():
    pass

pradeepvairamani

#Code For decorator
 
import timeit
import logging
 
def timer(func):
    def wrap(*args, **kwargs):
        started_at = time.time()
        result = func(*args, **kwargs)
        logging.info(time.time() - started_at)