code: def register_module(module_name, module=None):
      """
      Creates and globally registers a module with given name.
  
      :param module_name: the name of the module to register.
      :param module: the optional module to register to the given name, if not specified then a new empty module is created.
      :return: the module with given name.
      """
      if module_name not in sys.modules:
          mod = module or types.ModuleType(module_name)
          sys.modules[module_name] = mod
      return sys.modules[module_name]
  
file_path: h2o-3/h2o-py/h2o/utils/mixin.py
imports: import copy
  from importlib import import_module
  import sys
  import types
label_desc: Use image node_id 2 for calling a global function with example usage: register_module(module_name, module) and returns: sys