class_docstr: Make blob objects behave like Python strings.
  
  Expects that classes that use this mixin to have a _strkey() method that
  returns the string to apply string methods to. Using _strkey() instead
  of __str__ ensures consistent behavior between Python 2 and 3.
docstr: Like str.lower(), returns new object with all lower-cased characters.
          
docstr_tok: ["Like","str.lower","(",")",",","returns","new","object","with","all","lower-cased","characters","."]
code: def lower(self):
      """Like str.lower(), returns new object with all lower-cased characters."""
      return self.__class__(self._strkey().lower())
  
imports: from __future__ import absolute_import
  import sys
  from textblob.compat import basestring, implements_to_string, PY2, binary_type
label_desc: Use image node_id 18 for calling the StringlikeMixin obj's underlying member method code with example usage: obj.lower() and returns: self