code: def test_alpha_numeric_predicate(self):
      assert fn.alphaNumericPredicate("don4ld") == {"don4ld"}
      assert fn.alphaNumericPredicate("donald 1992") == {"1992"}
      assert fn.alphaNumericPredicate("g00fy  ") == {"g00fy"}
      assert fn.alphaNumericPredicate(" c1p   c10p ") == {"c1p", "c10p"}
  
imports: import unittest
  from dedupe import predicate_functions
  from dedupe.cpredicates import ngrams
label_desc: Use image node_id 6 for calling the TestPredicateFunctions obj's underlying member method code with example usage: obj.test_alpha_numeric_predicate() without return types