Python (3.x) function to calculate MD5 checksum for given file.

CalculateMd5

def calculateMD5(filename, block_size=2**20):
	"""Returns MD% checksum for given file.
	"""
	import hashlib

	md5 = hashlib.md5()
	try:
		file = open(filename, 'rb')
		while True:
			data = file.read(block_size)
			if not data:
				break
			md5.update(data)
	except IOError:
		print('File \'' + filename + '\' not found!')
		return None
	except:
		return None
	return md5.hexdigest