code: def _import_all_modules():
      
      import traceback
      import os
      global results
      globals_, locals_ = globals(), locals()
  
      def load_module(modulename, package_module):
          try:
              names = []
              module = __import__(package_module, globals_, locals_, [modulename])
  
              for name in module.__dict__:
                  if not name.startswith('_'):
                      globals_[name] = module.__dict__[name]
                      names.append(name)
          except Exception:
              traceback.print_exc()
              raise
  
          return module, names
  
      def load_dir(abs_dirpath, rel_dirpath=''):
          results = []
  
          # dynamically import all the package modules
          for filename in os.listdir(abs_dirpath):
              rel_filepath = os.path.join(rel_dirpath, filename)
              abs_filepath = os.path.join(abs_dirpath, filename)
  
              if filename[0] != '_' and os.path.isfile(abs_filepath) and filename.split('.')[-1] in ('py', 'pyw'):
                  modulename = '.'.join(os.path.normpath(os.path.splitext(rel_filepath)[0]).split(os.sep))
                  package_module = '.'.join([__name__, modulename])
  
                  module, names = load_module(modulename, package_module)
                  results += names
              elif os.path.isdir(abs_filepath):
                  results += load_dir(abs_filepath, rel_filepath)
  
          return results
  
      return load_dir(os.path.dirname(__file__))
docs: dynamically imports all modules in the package