code: def get_child_account(self, account_name):
          
  
          if r'/' in account_name:
              accs_in_path = account_name.split(r'/', 1)
  
              curr_acc = self[accs_in_path[0]]
              if curr_acc is None:
                  return None
              return curr_acc.get_child_account(accs_in_path[1])
              pass
          else:
              return self[account_name]
docs: Retrieves a child account.
          This could be a descendant nested at any level.
  
          :param account_name: The name of the account to retrieve.
  
          :returns: The child account, if found, else None.