[python] Use virtualenv 20.13.0 for python <= 3.6 (PY-61694)

GitOrigin-RevId: 88c6181ece24d1c36d2a27a8c7386ee8fbff2d08

python/src/com/jetbrains/python/PythonHelper.java

@@ -28,7 +28,7 @@ public enum PythonHelper implements HelperPackage {
   // Packaging tools
   PACKAGING_TOOL("packaging_tool.py"),
   VIRTUALENV_ZIPAPP("virtualenv-20.24.5.pyz"),
-  PY2_VIRTUALENV_ZIPAPP("virtualenv-20.13.0.pyz"),
+  LEGACY_VIRTUALENV_ZIPAPP("virtualenv-20.13.0.pyz"), // virtualenv used to create virtual environments for python 2.7 & 3.6
 
   COVERAGEPY_OLD("coveragepy_old", ""),
   COVERAGEPY_NEW("coveragepy_new", ""),

python/src/com/jetbrains/python/packaging/PyPackageManagerImpl.java

@@ -37,7 +37,7 @@ import static com.jetbrains.python.sdk.PySdkExtKt.showSdkExecutionException;
 @Deprecated
 public class PyPackageManagerImpl extends PyPackageManagerImplBase {
   private static final String VIRTUALENV_ZIPAPP_NAME = "virtualenv-20.24.5.pyz";
-  private static final String PY2_VIRTUALENV_ZIPAPP_NAME = "virtualenv-20.13.0.pyz";
+  private static final String LEGACY_VIRTUALENV_ZIPAPP_NAME = "virtualenv-20.13.0.pyz"; // virtualenv used to create virtual environments for python 2.7 & 3.6
 
   private static final Logger LOG = Logger.getInstance(PyPackageManagerImpl.class);
 
@@ -189,7 +189,7 @@ public class PyPackageManagerImpl extends PyPackageManagerImplBase {
 
     try {
       getPythonProcessResult(
-        Objects.requireNonNull(getHelperPath(languageLevel.isPython2() ? PY2_VIRTUALENV_ZIPAPP_NAME : VIRTUALENV_ZIPAPP_NAME)),
+        Objects.requireNonNull(getHelperPath(isLegacyPython(languageLevel) ? LEGACY_VIRTUALENV_ZIPAPP_NAME : VIRTUALENV_ZIPAPP_NAME)),
         args, false, true, null, List.of("-S"));
     }
     catch (ExecutionException e) {
@@ -202,6 +202,13 @@ public class PyPackageManagerImpl extends PyPackageManagerImplBase {
     return (binary != null) ? binary : binaryFallback;
   }
 
+  /**
+   * Is it a legacy python version that we still support
+   */
+  private static @NotNull Boolean isLegacyPython(@NotNull LanguageLevel languageLevel) {
+    return languageLevel.isPython2() || languageLevel.isOlderThan(LanguageLevel.PYTHON37);
+  }
+
   //   public List<PyPackage> refreshAndGetPackagesIfNotInProgress(boolean alwaysRefresh) throws ExecutionException
 
   private @NotNull String getHelperResult(@NotNull List<String> args,

python/src/com/jetbrains/python/packaging/PyTargetEnvironmentPackageManager.java

@@ -231,7 +231,7 @@ public class PyTargetEnvironmentPackageManager extends PyPackageManagerImplBase
     TargetEnvironmentRequest targetEnvironmentRequest = helpersAwareTargetRequest.getTargetEnvironmentRequest();
 
     PythonScriptExecution pythonExecution = PythonScripts.prepareHelperScriptExecution(
-      languageLevel.isPython2() ? PythonHelper.PY2_VIRTUALENV_ZIPAPP : PythonHelper.VIRTUALENV_ZIPAPP,
+      isLegacyPython(languageLevel) ? PythonHelper.LEGACY_VIRTUALENV_ZIPAPP : PythonHelper.VIRTUALENV_ZIPAPP,
       helpersAwareTargetRequest);
     if (useGlobalSite) {
       pythonExecution.addParameter("--system-site-packages");
@@ -247,6 +247,13 @@ public class PyTargetEnvironmentPackageManager extends PyPackageManagerImplBase
     return (binary != null) ? binary : binaryFallback;
   }
 
+  /**
+   * Is it a legacy python version that we still support
+   */
+  private static @NotNull Boolean isLegacyPython(@NotNull LanguageLevel languageLevel) {
+    return languageLevel.isPython2() || languageLevel.isOlderThan(LanguageLevel.PYTHON37);
+  }
+
   @NotNull
   private String getPythonProcessResult(@NotNull PythonExecution pythonExecution,
                                         boolean askForSudo,