Update LanguageSetting.ps1 (Azure#15639)

* add function for getting existing package versions

* Add SetPackageVersion function

* Add GetPackageInstallNotes function

Author: chidozieononiwu

eng/scripts/Language-Settings.ps1

@@ -226,4 +226,18 @@ function SetPackageVersion ($PackageName, $Version, $ServiceDirectory, $ReleaseD
   }
   pip install -r "$EngDir/versioning/requirements.txt" -q -I
   python "$EngDir/versioning/version_set.py" --package-name $PackageName --new-version $Version --service $ServiceDirectory --release-date $ReleaseDate
+}
+
+function GetExistingPackageVersions ($PackageName, $GroupId=$null)
+{
+  try
+  {
+    $existingVersion = Invoke-RestMethod -Method GET -Uri "https://pypi.python.org/pypi/${PackageName}/json"
+    return ($existingVersion.releases | Get-Member -MemberType NoteProperty).Name
+  }
+  catch
+  {
+    LogError "Failed to retrieve package versions. `n$_"
+    return $null
+  }
 }

sdk/core/azure-core/CHANGELOG.md

@@ -9,7 +9,6 @@
 
 - Added `AzureSasCredential` and its respective policy. #15946
 
-
 ## 1.9.0 (2020-11-09)
 
 ### Features