How to use the authlib.oauth1.rfc5849.util.escape function in Authlib

if k in ('oauth_signature', 'realm'):
            continue

        # ensure oauth params are unescaped
        if k.startswith('oauth_'):
            v = unescape(v)
        unescaped_params.append((k, v))

    # Normalize parameters per Section 3.4.1.3.2
    normalized_params = normalize_parameters(unescaped_params)

    # construct base string
    return '&'.join([
        escape(method.upper()),
        escape(base_string_uri),
        escape(normalized_params),
    ])

for k, v in params:
        # The "oauth_signature" parameter MUST be excluded from the signature
        if k in ('oauth_signature', 'realm'):
            continue

        # ensure oauth params are unescaped
        if k.startswith('oauth_'):
            v = unescape(v)
        unescaped_params.append((k, v))

    # Normalize parameters per Section 3.4.1.3.2
    normalized_params = normalize_parameters(unescaped_params)

    # construct base string
    return '&'.join([
        escape(method.upper()),
        escape(base_string_uri),
        escape(normalized_params),
    ])

# The "oauth_signature" parameter MUST be excluded from the signature
        if k in ('oauth_signature', 'realm'):
            continue

        # ensure oauth params are unescaped
        if k.startswith('oauth_'):
            v = unescape(v)
        unescaped_params.append((k, v))

    # Normalize parameters per Section 3.4.1.3.2
    normalized_params = normalize_parameters(unescaped_params)

    # construct base string
    return '&'.join([
        escape(method.upper()),
        escape(base_string_uri),
        escape(normalized_params),
    ])

oauth_token="ad180jjd733klru7",
            oauth_signature_method="HMAC-SHA1",
            oauth_signature="wOJIO9A2W5mFwDgiDvZbTSMK%2FPY%3D",
            oauth_timestamp="137131200",
            oauth_nonce="4572616e48616d6d65724c61686176",
            oauth_version="1.0"


    .. _`section 3.5.1`: https://tools.ietf.org/html/rfc5849#section-3.5.1
    .. _`RFC2617`: https://tools.ietf.org/html/rfc2617
    """
    headers = headers or {}

    # step 1, 2, 3 in Section 3.5.1
    header_parameters = ', '.join([
        '{0}="{1}"'.format(escape(k), escape(v)) for k, v in oauth_params
        if k.startswith('oauth_')
    ])

    # 4.  The OPTIONAL "realm" parameter MAY be added and interpreted per
    #     `RFC2617 section 1.2`_.
    #
    # .. _`RFC2617 section 1.2`: https://tools.ietf.org/html/rfc2617#section-1.2
    if realm:
        # NOTE: realm should *not* be escaped
        header_parameters = 'realm="{}", '.format(realm) + header_parameters

    # the auth-scheme name set to "OAuth" (case insensitive).
    headers['Authorization'] = 'OAuth {}'.format(header_parameters)
    return headers

and concatenated together into a single string (line breaks are for
    display purposes only)::

        a2=r%20b&a3=2%20q&a3=a&b5=%3D%253D&c%40=&c2=&oauth_consumer_key=9dj
        dj82h48djs9d2&oauth_nonce=7d8f3e4a&oauth_signature_method=HMAC-SHA1
        &oauth_timestamp=137131201&oauth_token=kkk9d7dh3k39sjv7

    .. _`Section 3.4.1.3.2`: https://tools.ietf.org/html/rfc5849#section-3.4.1.3.2
    """

    # 1.  First, the name and value of each parameter are encoded
    #     (`Section 3.6`_).
    #
    # .. _`Section 3.6`: https://tools.ietf.org/html/rfc5849#section-3.6
    key_values = [(escape(k), escape(v)) for k, v in params]

    # 2.  The parameters are sorted by name, using ascending byte value
    #     ordering.  If two or more parameters share the same name, they
    #     are sorted by their value.
    key_values.sort()

    # 3.  The name of each parameter is concatenated to its corresponding
    #     value using an "=" character (ASCII code 61) as a separator, even
    #     if the value is empty.
    parameter_parts = ['{0}={1}'.format(k, v) for k, v in key_values]

    # 4.  The sorted name/value pairs are concatenated together into a
    #     single string by using an "&" character (ASCII code 38) as
    #     separator.
    return '&'.join(parameter_parts)

text = base_string

    # key is set to the concatenated values of:
    # 1.  The client shared-secret, after being encoded (`Section 3.6`_).
    #
    # .. _`Section 3.6`: https://tools.ietf.org/html/rfc5849#section-3.6
    key = escape(client_secret or '')

    # 2.  An "&" character (ASCII code 38), which MUST be included
    #     even when either secret is empty.
    key += '&'

    # 3.  The token shared-secret, after being encoded (`Section 3.6`_).
    #
    # .. _`Section 3.6`: https://tools.ietf.org/html/rfc5849#section-3.6
    key += escape(token_secret or '')

    signature = hmac.new(to_bytes(key), to_bytes(text), hashlib.sha1)

    # digest  is used to set the value of the "oauth_signature" protocol
    #         parameter, after the result octet string is base64-encoded
    #         per `RFC2045, Section 6.8`.
    #
    # .. _`RFC2045, Section 6.8`: https://tools.ietf.org/html/rfc2045#section-6.8
    sig = binascii.b2a_base64(signature.digest())[:-1]
    return to_unicode(sig)

The "PLAINTEXT" method does not employ a signature algorithm.  It
    MUST be used with a transport-layer mechanism such as TLS or SSL (or
    sent over a secure channel with equivalent protections).  It does not
    utilize the signature base string or the "oauth_timestamp" and
    "oauth_nonce" parameters.

    .. _`Section 3.4.4`: https://tools.ietf.org/html/rfc5849#section-3.4.4
    """

    # The "oauth_signature" protocol parameter is set to the concatenated
    # value of:

    # 1.  The client shared-secret, after being encoded (`Section 3.6`_).
    #
    # .. _`Section 3.6`: https://tools.ietf.org/html/rfc5849#section-3.6
    signature = escape(client_secret or '')

    # 2.  An "&" character (ASCII code 38), which MUST be included even
    #     when either secret is empty.
    signature += '&'

    # 3.  The token shared-secret, after being encoded (`Section 3.6`_).
    #
    # .. _`Section 3.6`: https://tools.ietf.org/html/rfc5849#section-3.6
    signature += escape(token_secret or '')

    return signature