Write a Lexical Analyzer in Python that recognizes keywords, delimiters, primitive constants and operations, identifiers, and numbers using the following syntax definitions: Keywords if, then, else, map, to, let, in, null, true, false Definitions Lower Upper Other Digit Alpha AlphaOther Delimiter :: a b c d] ::= "A" | "B" | "C" | "D" | ::= ? | ... ... "Z" ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 ::= Upper | Lower Alpha | Other. AlphaOtherNumeric::= AlphaOther | Digit | [ | ] | ( 1 ) =:: | ; Operator "|" | := ::= "+" | |~| "*" | / | = | != | < | > | | & Primitive Constants and Operations Null :: null Bool ::= true false. Unop :: Sign | Sign ::= "+" | ~ Binop Sign | 11* 11 | / | = | != | < | > | = | & "\" Prim ::= number? | function? | list? | null? | cons? | cons | first rest | arity Identifiers Id AlphaOther (AlphaOther | Digit} * Numbers Int Digit+