test on ubuntu

pandas fails to install on 32-bit python on 64-bit windows, sometimes
Why do we test on windows anyways?

appveyor.yml

@@ -1,4 +1,4 @@
-image: Visual Studio 2022
+image: Ubuntu
 environment:
 
   matrix:
@@ -8,22 +8,20 @@ environment:
     # The list here is complete (excluding Python 2.6, which
     # isn't covered by this document) at the time of writing.
 
-    - PYTHON: "C:\\Python37"
-    - PYTHON: "C:\\Python38"
-    - PYTHON: "C:\\Python39"
-    - PYTHON: "C:\\Python37-x64"
-    - PYTHON: "C:\\Python38-x64"
-    - PYTHON: "C:\\Python39-x64"
-    - PYTHON: "C:\\Python310-x64"
-    - PYTHON: "C:\\Python311-x64"
+    - PYTHON: "{HOME}/venv3.7/bin/python"
+    - PYTHON: "{HOME}/venv3.8/bin/python"
+    - PYTHON: "{HOME}/venv3.9/bin/python"
+    - PYTHON: "{HOME}/venv3.10/bin/python"
+    - PYTHON: "{HOME}/venv3.11/bin/python"
+    - PYTHON: "{HOME}/venv3.12/bin/python"
 
 install:
   # Newer setuptools is needed for proper support of pyproject.toml
-  - "%PYTHON%\\python.exe -m pip install setuptools --upgrade"
-  # We need wheel installed to build wheels
-  - "%PYTHON%\\python.exe -m pip install wheel --upgrade"
-  - "%PYTHON%\\python.exe -m pip install build setuptools_scm"
-  - "%PYTHON%\\python.exe -m pip install pytest numpy pandas"
+  - env
+  - which -a python
+  - ls ~/venv3.7/bin
+  - echo $PYTHON
+  - sh: $PYTHON -m pip install build pytest numpy pandas
 
 build: off
 
@@ -35,20 +33,18 @@ test_script:
   # Note that you must use the environment variable %PYTHON% to refer to
   # the interpreter you're using - Appveyor does not do anything special
   # to put the Python version you want to use on PATH.
-  #- "build.cmd %PYTHON%\\python.exe setup.py test"
-  - "%PYTHON%\\python.exe -m pytest -v --doctest-modules --ignore benchmark.py"
+  - sh: $PYTHON -m pytest -v --doctest-modules --ignore benchmark.py
+
 
 after_test:
   # This step builds your wheels.
   # Again, you only need build.cmd if you're building C extensions for
   # 64-bit Python 3.3/3.4. And you need to use %PYTHON% to get the correct
   # interpreter
-  #- "build.cmd %PYTHON%\\python.exe setup.py bdist_wheel"
-  - "%PYTHON%\\python.exe -m build -nswx ."
+  - sh: $PYTHON -m build .
 
 artifacts:
-  # bdist_wheel puts your built wheel in the dist directory
-  - path: dist\*
+  - path: dist/*
 
 #on_success:
 #  You can use this step to upload your artifacts to a public website.