A simple timer for python code blocks

timer_utils.py

import time
class timer(object):
    """
        A simple timer used to time blocks of code. Usage as follows:
        
        with timer("optional_name"):
            some code ...
            some more code
    """
    def __init__(self, name=None):
        self.name = name

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

    def __exit__(self, *args):
        self.end = time.time()
        self.interval = self.end - self.start
        if self.name:
            print("{} -  Elapsed time: {:.4f}s".format(self.name, self.interval))
        else:
            print("Elapsed time: {:.4f}s".format(self.interval))