environment/lib/python2.7/site-packages/IPython/lib/deepreload.py
def add_submodule(mod, submod, fullname, subname):
    """mod.{subname} = submod"""
    if mod is None:
        return #Nothing to do here.

    if submod is None:
        submod = sys.modules[fullname]

    setattr(mod, subname, submod)

    return
def add_submodule(mod, submod, fullname, subname):
    """mod.{subname} = submod"""
    if mod is None:
        return #Nothing to do here.

    if submod is None:
        submod = sys.modules[fullname]

    setattr(mod, subname, submod)

    return
mod.{subname} = submod