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The error comes from string/unicode changes in Python 3. In Python 2, string type are bytes, but in Python 3 string type is separate from byte type – which is causing the error you’re seeing.
If you’re using Python 3.x with memcached, use the python3-memcached
package. It’s a drop in replacement for python-memcached
.
pip install python3-memcached
Source:stackexchange.com