Start using MyPy in CI

* MyPy related cleanup

* Simple mypy conf

* Run mypy on travis

* Install mypy before using it

* Remove unused functions

* Added some type annotations to geom

* Started adding annotations + minor cleanups

* Apply black

* find/replace typo fix

* mypy.ini cleanup

* Install OCP-stubs before running mypy in travis

* Try without ignoring missing imports

* Install ocp before running mypy

* More explicit ignoring import policy

* install mypy via conda

* Mypy debugging

* Cleanup of travis.yml

* Added annotations to BoundBox

* Added coveragerc

* Add member types in Plane

* Correct .coveragerc

* Blackify geom

.coveragerc

@@ -0,0 +1,7 @@
+[run]
+branch = True
+
+[report]
+exclude_lines =
+    # Ignore stub body
+    \.\.\.

.travis.yml

@@ -41,6 +41,7 @@ matrix:
     os: linux
     script:
     - black . --diff --check
+    - mypy cadquery
 
 before_install:
 - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
@@ -54,7 +55,8 @@ before_install:
 - conda config --set always_yes yes --set changeps1 no;
 - conda env create -f environment.yml
 - source ~/miniconda/bin/activate cadquery
-- conda install -c conda-forge -c defaults -c cadquery python=$PYTHON_VERSION
+- conda install -c conda-forge -c defaults -c cadquery python=$PYTHON_VERSION mypy
+- pip install git+https://github.com/CadQuery/OCP-stubs.git
 
 install:
 - python setup.py install

cadquery/occ_impl/exporters.py

@@ -6,10 +6,7 @@
 import os
 import sys
 
-if sys.version_info.major == 2:
-    import cStringIO as StringIO
-else:
-    import io as StringIO
+import io as StringIO
 
 from .shapes import Shape, Compound, TOLERANCE
 from .geom import BoundBox
@@ -20,10 +17,7 @@
 from OCP.HLRAlgo import HLRAlgo_Projector
 from OCP.GCPnts import GCPnts_QuasiUniformDeflection
 
-try:
-    import xml.etree.cElementTree as ET
-except ImportError:
-    import xml.etree.ElementTree as ET
+import xml.etree.cElementTree as ET
 
 DISCRETIZATION_TOLERANCE = 1e-3
 DEFAULT_DIR = gp_Dir(-1.75, 1.1, 5)