Adds type checking (through mypy) to CI

.devcontainer/Dockerfile

@@ -31,7 +31,7 @@ COPY requirements.txt /requirements.txt
 
 RUN python3 -m pip install -r requirements.txt
 
-RUN python3 -m pip install --upgrade flake8-pytest-importorskip click==8.0.4 black==24.4.2 flake8==4.0.1
+RUN python3 -m pip install --upgrade flake8-pytest-importorskip click==8.0.4 black==24.4.2 flake8==4.0.1 mypy==1.13.0
 
 RUN groupadd -g ${USER_GID} ${USERNAME} && \
     adduser --disabled-password --uid ${USER_UID} --gid ${USER_GID} --gecos "" ${USERNAME} && \

.github/workflows/unit-tests.yaml

@@ -37,19 +37,25 @@ jobs:
         python setup.py build_ext --inplace
         python -m pip list
 
-    - name: Update Black
+    - name: Update Black and mypy
       if: ${{ matrix.python-version == 3.9 }}
       run: |
         pip install flake8-pytest-importorskip
         pip install --upgrade click==8.0.4
         pip install black==24.4.2
         pip install flake8==4.0.1
+        pip install mypy==1.13.0
 
     - name: Lint and Format Check with Flake8 and Black
       if: ${{ matrix.python-version == 3.9 }}
       run: |
         black --diff --check .
         flake8
+        
+    - name: Run type checking with mypy
+      if: ${{ matrix.python-version == 3.9 }}
+      run: |
+        mypy hatchet --pretty
 
     - name: Check License Headers
       run: |

hatchet/graphframe.py

@@ -1092,7 +1092,7 @@ def tree(
 
         if color is False:
             try:
-                import IPython
+                import IPython  # type: ignore[import-not-found]
 
                 shell = IPython.get_ipython().__class__.__name__
             except ImportError: