class_docstr: Magics to manage the IPython extensions system.
docstr: Reload an IPython extension by its module name.
code: def reload_ext(self, module_str):
      """Reload an IPython extension by its module name."""
      if not module_str:
          raise UsageError("Missing module name.")
      self.shell.extension_manager.reload_extension(module_str)
  
file_path: catboost/contrib/python/ipython/py2/IPython/core/magics/extension.py
imports: from __future__ import print_function
  import os
  from IPython.core.error import UsageError
  from IPython.core.magic import Magics, magics_class, line_magic
  from warnings import warn
label_desc: Use image node_id 3 for calling the ExtensionMagics obj's underlying member method code with example usage: obj.reload_ext(module_str) without return types