With the changes in parso, f-strings are now completable

test/completion/fstring.py

@@ -0,0 +1,17 @@
+# python >= 3.6
+
+class Foo:
+    bar = 1
+
+#? 10 int()
+f'{Foo.bar}'
+#? 10 ['bar']
+f'{Foo.bar}'
+#? 10 int()
+Fr'{Foo.bar'
+#? 10 ['bar']
+Fr'{Foo.bar'
+#? int()
+Fr'{Foo.bar
+#? ['bar']
+Fr'{Foo.bar