CODEWITHSUNDEEP
pythonmd5hashlib
Steve
Steve

Reputation: 219

How to reuse an instance of hashlib.md5

How do you flush (or reset) and reuse an instance of hashlib.md5 in python? If I am performing multiple hashing operations in a script, it seems inefficient to use a new instance of hashlib.md5 each time, but from the python documentation I don't see any way to flush or reset the instance.

Upvotes: 21

Views: 10007

Answers (2)

Kevin Hill
Kevin Hill

Reputation: 493

Here's what I did, just write a little wrapper that reinitializes the hash object. Handles the clunkiness of the code writing, but maybe not the efficiency at runtime.

def Hasher(object):
    def __init__(self):
        self.md5 = hashlib.md5()

    def get_hash(self, o):
        self.md5.update(o)
        my_hash = self.md5.digest()
        self.md5 = hashlib.md5()
        return my_hash

Upvotes: -3

Ned Batchelder
Ned Batchelder

Reputation: 375744

Why do you think it's inefficient to make a new one? It's a small object, and objects are created and destroyed all the time. Use a new one, and don't worry about it.

Upvotes: 8

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