<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def encode(url):
 """Encode URL."""

    parts = extract(url)
    return construct(URL(parts.scheme,
                         parts.username,
                         parts.password,
                         _idna_encode(parts.subdomain),
                         _idna_encode(parts.domain),
                         _idna_encode(parts.tld),
                         parts.port,
                         quote(parts.path.encode('utf-8')),
                         _encode_query(parts.query),
                         quote(parts.fragment.encode('utf-8')),
                         None))