Function _remove_variables

nltk/featstruct.py:1307–1324

(fstruct, fs_class, visited)

def _remove_variables(fstruct, fs_class, visited):
    if id(fstruct) in visited:
        return
    visited.add(id(fstruct))

    if _is_mapping(fstruct):
        items = list(fstruct.items())
    elif _is_sequence(fstruct):
        items = list(enumerate(fstruct))
    else:
        raise ValueError("Expected mapping or sequence")

    for fname, fval in items:
        if isinstance(fval, Variable):
            del fstruct[fname]
        elif isinstance(fval, fs_class):
            _remove_variables(fval, fs_class, visited)
    return fstruct


######################################################################