Completeing the Class

[baboon]

Can someone please help me finish this code. I am a college student learning python for the first time and I am stuck at the def getNextToken part

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""" File: scanner.py A scanner for processing languages. """   from tokens import Token   class Scanner(object):       EOE = ';'        # end-of-expression     TAB = '\t'       # tab       def __init__(self, sourceStr):         self._tokens = sourceStr         self.currentChar = self._tokens[1]         self.index = 1       def hasNext(self):         if self.index <= len(self._tokens):             return True         else:             return False             def next(self):         print("NEXT, index:", self.index, "tokens:", self._tokens)                       item=self._tokens[self.index-1]         if self.index < len(self._tokens):             self.currentChar = self._tokens[self.index]         self.index = self.index + 1         return item       def getFirstToken(self):         return self._tokens[0]           def getNextToken(self):         pass           def nextChar(self):         pass           def skipWhiteSpace(self):         pass           def getInteger(self):         pass   def main():     # A simple tester program     while True:         sourceStr = input("Enter an expression: ")         if sourceStr == "": break         scanner = Scanner(sourceStr)         while scanner.hasNext():             print(scanner.next())   if __name__ == '__main__':     main()

[jefsummers]

-tokens[] is your token list. When you process a token, suggest removing it from the list. Then getFirstToken() and getNextToken() are interchangeable.