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   object --+    
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ParserElement --+
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               ParseExpression
Abstract subclass of ParserElement, for combining and post-processing parsed tokens.
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 x.__init__(...) initializes x; see help(type(x)) for signature 
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 Extends  
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 Define expression to be ignored (e.g., comments) while doing pattern matching; may be called repeatedly, to define multiple comment or other ignorable patterns. Example: 
   patt = OneOrMore(Word(alphas))
   patt.parseString('ablaj /* comment */ lskjd') # -> ['ablaj']
   
   patt.ignore(cStyleComment)
   patt.parseString('ablaj /* comment */ lskjd') # -> ['ablaj', 'lskjd']
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 str(x) 
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 Define name for referencing matching tokens as a nested attribute of 
  the returned parse results. NOTE: this returns a *copy* of the original 
   You can also set results names using the abbreviated syntax, 
   Example: 
   date_str = (integer.setResultsName("year") + '/' 
               + integer.setResultsName("month") + '/' 
               + integer.setResultsName("day"))
   # equivalent form:
   date_str = integer("year") + '/' + integer("month") + '/' + integer("day")
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 Check defined expressions for valid structure, check for infinite recursive definitions. 
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 Make a copy of this  Example: 
   integer = Word(nums).setParseAction(lambda toks: int(toks[0]))
   integerK = integer.copy().addParseAction(lambda toks: toks[0]*1024) + Suppress("K")
   integerM = integer.copy().addParseAction(lambda toks: toks[0]*1024*1024) + Suppress("M")
   
   print(OneOrMore(integerK | integerM | integer).parseString("5K 100 640K 256M"))
prints: [5120, 100, 655360, 268435456] Equivalent form of  
   integerM = integer().addParseAction(lambda toks: toks[0]*1024*1024) + Suppress("M")
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