code: def strip_non_alphanum(s):
      """Remove non-alphabetic characters from `s` using :const:`~gensim.parsing.preprocessing.RE_NONALPHA`.
  
      Parameters
      ----------
      s : str
  
      Returns
      -------
      str
          Unicode string with alphabetic characters only.
  
      Notes
      -----
      Word characters - alphanumeric & underscore.
  
      Examples
      --------
      .. sourcecode:: pycon
  
          >>> from gensim.parsing.preprocessing import strip_non_alphanum
          >>> strip_non_alphanum("if-you#can%read$this&then@this#method^works")
          u'if you can read this then this method works'
  
      """
      s = utils.to_unicode(s)
      return RE_NONALPHA.sub(" ", s)
  
imports: import re
  import string
  import glob
  from gensim import utils
  from gensim.parsing.porter import PorterStemmer
label_desc: Use image node_id 8 for calling a global function with example usage: strip_non_alphanum(s) and returns: RE_NONALPHA