Update python.yml

Author: wenbinf

.github/workflows/python.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8, 3.9, 3.10]
+        python-version: [3.5, 3.6, 3.7, 3.8, 3.9, '3.10']
 
     steps:
     - uses: actions/checkout@v3