try to get conditional to work 7

Author: mattip

azure/posix.yml

@@ -25,17 +25,16 @@ jobs:
 
       - bash: |
           set -ex
-          echo AZURE_PYTHON_VERSION $AZURE_PYTHON_VERSION ${{ parameters.AZURE_PYTHON_VERSION }}
-          echo MB_PYTHON_VERSION $MB_PYTHON_VERSION ${{ parameters.MB_PYTHON_VERSION }}
-          echo together ${{ coalesce( parameters.AZURE_PYTHON_VERSION, parameters.MB_PYTHON_VERSION, 'Nothing' ) }}
-        displayName: Debug delete later
+          echo MB_PYTHON_VERSION $MB_PYTHON_VERSION
+          echo AZURE_PYTHON_VERSION $AZURE_PYTHON_VERSION
+          AZURE_PYTHON_VERSION=${AZURE_PYTHON_VERSION:-$MB_PYTHON_VERSION}
+          echo now AZURE_PYTHON_VERSION $AZURE_PYTHON_VERSION
+          echo "##vso[task.setvariable variable=AZURE_PYTHON_VERSION]$AZURE_PYTHON_VERSION"
+        displayName: Set AZURE_PYTHON_VERSION
 
       - task: UsePythonVersion@0
         inputs:
-          ${{ if ne(parameters.AZURE_PYTHON_VERSION, '') }}:
-            versionSpec: ${{ parameters.AZURE_PYTHON_VERSION }}
-          ${{ if eq(parameters.AZURE_PYTHON_VERSION, '') }}:
-            versionSpec: ${{ parameters.MB_PYTHON_VERSION }}
+          versionSpec: $AZURE_PYTHON_VERSION
         displayName: Set python version
 
       - bash: |