Make obvious that etcd3 is binary-clean for keys and values, with .put() coerced to bytes

[pjz]

Description

I put a str into etcd and got out bytes

What I Did

k, v = "foo", "bar"
...
client.put(k, v)
...
r = client.range(k).kvs[0].key
print(f"{r:<10}")

gets me

TypeError: unsupported format string passed to bytes.__format__

What I expected

I expected to be able to round-trip data through etcd without issue. As it is now, I have to explicitly cast everything back to str() if I want to use it in a format string like above.

[Revolution1]

Yes, that's a feature of etcd3:
Instead of etcd2 only accept ascii string as key and value,
the data type of etcd3's key&value are both binary data which is bytes in python3

so ... you have to manually convert it to str if you need.

[pjz]

I see. I'd suggest showing that in the short-docs to make it clear - as I said, it was quite surprising to me. Thanks for the quick reply!

[Revolution1]

Got it