Maybe it's a crazy idea, but what if we could decorate a single line
of code? For example:

@Timer
a = time_consuming_function()

This will be equivalent to using Steven's context manager, but the
decorator is more simple to comment and uncomment.

Maybe it could be possible to comment also code blocks:

@parallel
for x in y:
    do_something(x)
    now_something_completely_different(x)

This could be a shortcut for multiprocessing.
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