Version 1.51 is older, and newer versions have fixes for python3.
@@ -38,7 +38,7 @@ tests_require = [
'mongodict',
'pyasn1',
'pymongo==3.0.1',
'python-memcached == 1.51',
'python-memcached >= 1.51',
'pytest',
'mako',
#'pytest-coverage',
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