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from rply import LexerGenerator

lg = LexerGenerator()

lg.add('NUMBER', r'\d+(\.\d+)?')

lg.add('PLUS', r'\+')

lg.add('MINUS', r'-')

lg.add('MUL', r'\*')

lg.add('DIV', r'/')

lg.add('OPEN_PARENS', r'\(')

lg.add('CLOSE_PARENS', r'\)')

lg.add('EQUALS', r'=')

lg.add('SYMBOL', r'[^\s0-9][^\s]*')

lg.ignore(r'\s+')

lexer = lg.build()