environment/lib/python2.7/site-packages/IPython/lib/deepreload.py
def load_next(mod, altmod, name, buf):
    """
    mod, name, buf = load_next(mod, altmod, name, buf)

    altmod is either None or same as mod
    """

    if len(name) == 0:
        # completely empty module name should only happen in
        # 'from . import' (or '__import__("")')
        return mod, None, buf

    dot = name.find('.')
    if dot == 0:
        raise ValueError('Empty module name')

    if dot < 0:
        subname = name
        next = None
    else:
        subname = name[:dot]
        next = name[dot+1:]

    if buf != '':
        buf += '.'
    buf += subname

    result = import_submodule(mod, subname, buf)
    if result is None and mod != altmod:
        result = import_submodule(altmod, subname, subname)
        if result is not None:
            buf = subname

    if result is None:
        raise ImportError("No module named %.200s" % name)

    return result, next, buf
def load_next(mod, altmod, name, buf):
    """
    mod, name, buf = load_next(mod, altmod, name, buf)

    altmod is either None or same as mod
    """

    if len(name) == 0:
        # completely empty module name should only happen in
        # 'from . import' (or '__import__("")')
        return mod, None, buf

    dot = name.find('.')
    if dot == 0:
        raise ValueError('Empty module name')

    if dot < 0:
        subname = name
        next = None
    else:
        subname = name[:dot]
        next = name[dot+1:]

    if buf != '':
        buf += '.'
    buf += subname

    result = import_submodule(mod, subname, buf)
    if result is None and mod != altmod:
        result = import_submodule(altmod, subname, subname)
        if result is not None:
            buf = subname

    if result is None:
        raise ImportError("No module named %.200s" % name)

    return result, next, buf
def load_next ( mod , altmod , name , buf ) : if len ( name ) == 0 : # completely empty module name should only happen in # 'from . import' (or '__import__("")') return mod , None , buf dot = name . find ( '.' ) if dot == 0 : raise ValueError ( 'Empty module name' ) if dot < 0 : subname = name next = None else : subname = name [ : dot ] next = name [ dot + 1 : ] if buf != '' : buf += '.' buf += subname result = import_submodule ( mod , subname , buf ) if result is None and mod != altmod : result = import_submodule ( altmod , subname , subname ) if result is not None : buf = subname if result is None : raise ImportError ( "No module named %.200s" % name ) return result , next , buf
mod, name, buf = load_next(mod, altmod, name, buf)

    altmod is either None or same as mod
mod name buf = load_next ( mod altmod name buf )