Get 'None' or a default value if key does not exist about python-etcd3 HOT 6 CLOSED

You'd prefer something like this?

>>> import etcd3
>>> etcd = etcd3.client()
>>> etcd.get('not-a-key')
(None, <etcd3.client.KVMetadata object at 0x7f5e32621790>)
>>> etcd.get('not-a-key', default=b'toot')
(b'toot', <etcd3.client.KVMetadata object at 0x7f5e32621650>)

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I would indeed, I think it would allow to write more concise code in most situations. What do you think ?

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Official etcd2 client throws exception when key is not found, I would prefer current behavior. Current implementations can simply switch type of Exception handled without modifying logic around client.

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There is no official Python client for etcd, just third party libraries referenced in the documentation - as this one is. If you take a look at the behavior of the go etcd client for v3 API (which is the only one maintained by CoreOS as part of the project), it returns a data structure as part of the response (resp.Kvs) which is empty if a key is not found, and the error returned by the .Get method is 'nil' in this case.

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I'd mimic the behaviour of dict: raise KeyError (or a subclass thereof containing the KVMetadata object) if a non-existent key is accessed without providing a default. To check if a key exists in/__contains__ should be used. (A successful get returning a tuple isn't particularly nice either, maybe a proxy object would work there better?)

Disclaimer: I've never used etcd nor this library.

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Addressed by #73

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