@Nullable
  public static Sdk findSdkForFile(PsiFileSystemItem psifile) {
    if (psifile == null) {
      return null;
    }
    Module module = ModuleUtilCore.findModuleForPsiElement(psifile);
    if (module != null) {
      return PythonSdkUtil.findPythonSdk(module);
    }
    return findSdkForNonModuleFile(psifile);
  }
@Nullable
  public static Sdk findSdkForFile(PsiFileSystemItem psifile)