human
What is a the Python code you requested given the following:
Complete the below
def _extend_str(class_node, rvalue):

    ''''function to extend builtin str/unicode class'
    '''
assistant
#Here is the Python code you requested.
    code = dedent("\n                class    whatever(object):\n                                def    join(self,    iterable):\n                                                return    {rvalue}\n                                def    replace(self,    old,    new,    count=None):\n                                                return    {rvalue}\n                                def    format(self,    *args,    **kwargs):\n                                                return    {rvalue}\n                                def    encode(self,    encoding='ascii',    errors=None):\n                                                return    ''\n                                def    decode(self,    encoding='ascii',    errors=None):\n                                                return    u''\n                                def    capitalize(self):\n                                                return    {rvalue}\n                                def    title(self):\n                                                return    {rvalue}\n                                def    lower(self):\n                                                return    {rvalue}\n                                def    upper(self):\n                                                return    {rvalue}\n                                def    swapcase(self):\n                                                return    {rvalue}\n                                def    index(self,    sub,    start=None,    end=None):\n                                                return    0\n                                def    find(self,    sub,    start=None,    end=None):\n                                                return    0\n                                def    count(self,    sub,    start=None,    end=None):\n                                                return    0\n                                def    strip(self,    chars=None):\n                                                return    {rvalue}\n                                def   ...