diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..9ae5093
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,37 @@
+# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
+
+name: CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.13"]
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v3
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install ruff pytest 
+        python -m pip install -e .
+    - name: Lint with ruff
+      run: |
+        ruff check --select E,F --exclude ./demos
+    - name: Test with pytest
+      run: |
+        pytest 
diff --git a/mod/hallmark/__init__.py b/mod/hallmark/__init__.py
index b96f40c..d7d33d8 100644
--- a/mod/hallmark/__init__.py
+++ b/mod/hallmark/__init__.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from .core import ParaFrame
+from .core import ParaFrame as ParaFrame
diff --git a/mod/hallmark/core.py b/mod/hallmark/core.py
index e621501..eec2596 100644
--- a/mod/hallmark/core.py
+++ b/mod/hallmark/core.py
@@ -121,16 +121,16 @@ def ParaFrame(fmt, *args, debug=False, **kwargs):
         elif n > 0:
             print(f'{n} match, i.e., "{files[0]}"')
         else:
-            print(f'No match; please check format string')
+            print('No match; please check format string')
 
     # Parse list of file names back to parameters
     parser = parse.compile(fmt)
 
-    l = []
+    frame = []
     for f in files:
         r = parser.parse(f)
         if r is None:
             print(f'Failed to parse "{f}"')
         else:
-            l.append({'path':f, **r.named})
-    return pd.DataFrame(l)
+            frame.append({'path':f, **r.named})
+    return pd.DataFrame(frame)