Modified with new name

.github/workflows/python-installation.yml

@@ -1,13 +1,23 @@
 name: Installing Python
-
-on: [push]
-
+'on':
+  - push
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: '${{ matrix.os }}'
+    strategy:
+      matrix:
+        os:
+          - windows-latest
+          - ubuntu-latest
+          - macos-12
+
+        py-version:
+          - 3.9
+          - 3.8
+          - 3.7
+
     steps:
-    - name: Set up Python
-      uses: actions/setup-python@v4
-      with:
-        python-version: 3.7
-
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '${{ matrix.py-version }}'