TST: Default to Python3.8 on Windows, Mac, and Linux testing.

This is in preparation for dropping Python 3.7. It also allows the
use of name-only arguments in function signatures.

Author: charris

.github/workflows/build_test.yml

@@ -16,7 +16,7 @@ defaults:
 
 env:
   DOWNLOAD_OPENBLAS: 1
-  PYTHON_VERSION: 3.7
+  PYTHON_VERSION: 3.8
 
 jobs:
   lint:
@@ -56,7 +56,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9, 3.10.0-beta.4]
+        python-version: [3.7, 3.9, 3.10.0-beta.4]
     steps:
     - uses: actions/checkout@v2
       with:

.travis.yml

@@ -26,7 +26,7 @@ cache:
 
 jobs:
   include:
-    - python: 3.7
+    - python: 3.8
       os: linux
       arch: ppc64le
       env:
@@ -35,7 +35,7 @@ jobs:
        - NPY_USE_BLAS_ILP64=1
        - ATLAS=None
 
-    - python: 3.7
+    - python: 3.8
       os: linux
       arch: s390x
       env:
@@ -44,7 +44,7 @@ jobs:
        - NPY_USE_BLAS_ILP64=1
        - ATLAS=None
 
-    - python: 3.7
+    - python: 3.8
       os: linux
       arch: arm64
       virt: vm

azure-pipelines.yml

@@ -73,7 +73,7 @@ stages:
     strategy:
       matrix:
           Python37-32bit-fast:
-            PYTHON_VERSION: '3.7'
+            PYTHON_VERSION: '3.8'
             PYTHON_ARCH: 'x86'
             TEST_MODE: fast
             BITS: 32
@@ -120,11 +120,11 @@ stages:
     strategy:
       maxParallel: 3
       matrix:
-          Python37:
-            PYTHON_VERSION: '3.7'
+          Python38:
+            PYTHON_VERSION: '3.8'
             USE_OPENBLAS: '1'
-          Python37-ILP64:
-            PYTHON_VERSION: '3.7'
+          Python38-ILP64:
+            PYTHON_VERSION: '3.8'
             NPY_USE_BLAS_ILP64: '1'
             USE_OPENBLAS: '1'
     steps:
@@ -232,7 +232,7 @@ stages:
       inputs:
         testResultsFiles: '**/test-*.xml'
         failTaskOnFailedTests: true
-        testRunTitle: 'Publish test results for Python 3.7 64-bit full Mac OS'
+        testRunTitle: 'Publish test results for Python 3.8 64-bit full Mac OS'
 
 
   - job: Windows