docstr: A method to clean the code to prevent malicious code execution.
  
  Args:
      code(str): A python code.
  
  Returns:
      str: A clean code string.
docstr_tok: ["A","method","to","clean","the","code","to","prevent","malicious","code","execution",".","Args",":","code","(","str",")",":","A","python","code",".","Returns",":","str",":","A","clean","code","string","."]
code: def _clean_code(
      self, code: str, context: CodeExecutionContext
  ) -> str:
      """
      A method to clean the code to prevent malicious code execution.
  
      Args:
          code(str): A python code.
  
      Returns:
          str: A clean code string.
  
      """
  
      # Clear recent optional dependencies
      self._additional_dependencies = []
  
      tree = ast.parse(code)
  
      # Check for imports and the node where analyze_data is defined
      new_body = []
      for node in tree.body:
          if isinstance(node, (ast.Import, ast.ImportFrom)):
              self._check_imports(node)
              continue
  
          if (
              self._is_df_overwrite(node)
              or self._is_jailbreak(node)
              or self._is_unsafe(node)
          ):
              continue
  
          # if generated code contain execute_sql_query def remove it
          # function already defined
          if self.check_direct_sql_func_def_exists(node):
              continue
  
          # Sanity for sql query the code should only use allowed tables
          if (
              isinstance(node, ast.Assign)
              and self._config.direct_sql
              and (
                  unauthorized_tables := self._get_sql_irrelevant_tables(
                      node
                  )
              )
          ):
              raise MaliciousQueryError(
                  f"Query uses unauthorized tables: {unauthorized_tables}. Please add them as new datatables or update the query."
              )
  
          self.find_function_calls(node, context)
  
          new_body.append(node)
  
      new_tree = ast.Module(body=new_body)
      return astor.to_source(
          new_tree, pretty_source=lambda x: "".join(x)
      ).strip()
  
imports: import re
  import ast
  import uuid
  from collections import defaultdict
  import astor
  import pandas
  from pandasai.helpers.path import find_project_root
  from pandasai.helpers.skills_manager import SkillsManager
  from pandasai.helpers.sql import extract_table_names
  from .node_visitors import AssignmentVisitor, CallVisitor
  from .save_chart import add_save_chart
  from .optional import import_dependency
  from ..exceptions import BadImportError, MaliciousQueryError, NoResultFoundError, InvalidConfigError
  from ..constants import WHITELISTED_BUILTINS, WHITELISTED_LIBRARIES
  from typing import Union, List, Generator, Any
  from ..helpers.logger import Logger
  from ..schemas.df_config import Config
  import logging
  import traceback
label_desc: Use image node_id 13 for calling the CodeManager obj's underlying member method code with example usage: obj._clean_code(code, context) and returns: astor