A context manager as a simple timer

See if you can write a context manger that will time some code.

When using it, you can do:

with timer:
    this_is_some_code_to_run()
    how_long_might_it_take

and you'll get something like:

this code took 0.12 seconds

NOTE:

you can do simple timing with the time module. Without a context, you'd do:

import time

start_time = time.clock()

run_some_code_here

run_time = time.clock - start_time
print "this code took %f seconds"%run_time)

But isn't::: with Timer():

easier?

NOTE2:

The context manager's __exit__() method is called with three arguments, the exception details (type, value, traceback): the same values returned by sys.exc_info(), which can also be None if no exception occurred).

If you do'nt want to do anytihng special with exceptions, youc an ignore them, but the __exit__ method msut take something:

def __exit__(self, *args)
    your_code_that
    ignors_exceptions

will do fine...