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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def smart_unicode(s, encoding='utf-8', strings_only=False, errors='strict'):
 """ Returns a unicode object representing 's'. Treats bytestrings using the 'encoding' codec. If strings_only is True, don't convert (some) non-string-like objects. """

    # if isinstance(s, Promise):
    #     # The input is the result of a gettext_lazy() call.
    #     return s
    return force_unicode(s, encoding, strings_only, errors)