public static @Nullable VirtualFile findRequirementsTxt(@NotNull Module module) {
    final String requirementsPath = PyPackageRequirementsSettings.getInstance(module).getRequirementsPath();
    if (!requirementsPath.isEmpty()) {
      final VirtualFile file = LocalFileSystem.getInstance().findFileByPath(requirementsPath);
      if (file != null) {
        return file;
      }
      final ModuleRootManager manager = ModuleRootManager.getInstance(module);
      for (VirtualFile root : manager.getContentRoots()) {
        final VirtualFile fileInRoot = root.findFileByRelativePath(requirementsPath);
        if (fileInRoot != null) {
          return fileInRoot;
        }
      }
    }
    return null;
  }
public static @Nullable VirtualFile findRequirementsTxt(@NotNull Module module)