docstr: reads a list of requirements from the config; field is the name of the field in the ini file,
  like Requires or Before, and section is the name of the [section] in the ini file; additionally,
  reads more requirements from [extra_section] if specified.
docstr_tok: ["reads","a","list","of","requirements","from","the","config",";","field","is","the","name","of","the","field","in","the","ini","file",",","like","Requires","or","Before",",","and","section","is","the","name","of","the","[","section","]","in","the","ini","file",";","additionally",",","reads","more","requirements","from","[","extra_section","]","if","specified","."]
code: def get_script_requirements(self, field, section, extra_section=None):
      """reads a list of requirements from the config; field is the name of the field in the ini file,
      like Requires or Before, and section is the name of the [section] in the ini file; additionally,
      reads more requirements from [extra_section] if specified."""
  
      x = self.config.get(section, field, fallback="")
  
      if extra_section:
          x = (
              x
              + ", "
              + self.config.get(extra_section, field, fallback="")
          )
  
      return self.parse_list(x.lower())
  
imports: from __future__ import annotations
  import configparser
  import os
  import threading
  import re
  from modules import shared, errors, cache, scripts
  from modules.gitpython_hack import Repo
  from modules.paths_internal import extensions_dir, extensions_builtin_dir, script_path
label_desc: Use image node_id 2 for calling the ExtensionMetadata obj's underlying member method code with example usage: obj.get_script_requirements(field, section, extra_section) and returns: self