Install datrie only if on CPython > 3.7

cclauss · web-flow · commit e8a3efc39320 · 2019-04-18T08:18:12.000+02:00
pytries/datrie#52 although ___closed___ is not yet released to https://pypi.org/project/datrie
diff --git a/requirements-optional.txt b/requirements-optional.txt
@@ -14,4 +14,6 @@ lxml ; platform_python_implementation == 'CPython'
 
 # DATrie can be used in place of our Python trie implementation for
 # slightly better parsing performance.
-datrie ; platform_python_implementation == 'CPython'
+# https://github.com/pytries/datrie/issues/52 although closed is not
+# yet released to https://pypi.org/project/datrie
+datrie ; platform_python_implementation == 'CPython' and python_version < '3.7'
