Python 3 - Opening files Using the "with" Statement

I just learnt how to save a few lines when opening files in Python 3 using the with statement.

From what I understand, the statement uses try and then opens the file, processes it and closes it. How efficient is that?

"Because I'm BATMAN!"

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	#! Python 3.4
	### using the "with" statment to open a file###
	"""Two ways to open a file"""
	""" The old way """
	file = open('example.txt', 'r')
	read_file = file.read()
	print (read_file)
	file.close()
	""" Or more properly, I guess. """
	try:
	file = open('example.txt', 'r')
	read_file = file.read()
	print (read_file)
	finally:
	file.close()
	""" Using the 'with'statement:
	This opens the file, processes it and closes it"""
	with open('example.txt', 'r') as file:
	read_file = file.read()
	print (read_file)
	"""
	RESULT:
	>>>
	"Because I'm Batman!"
	"Because I'm Batman!"
	"Because I'm Batman!"
	>>>
	"""

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To learn more about the with statement:
http://effbot.org/zone/python-with-statement.htm