Tristan Seligmann wrote: > * Guido van Rossum <guido at python.org> [2007-04-29 18:19:20 -0700]: > >>> In my mind, 'if' and 'or' are "syntax", whereas things like 'None' or >>> 'True' are "values"; even if None becomes an actual keyword, rather than >>> a builtin. >> I'm sorry, but that is such an incredibly subjective difference that I >> can't do anything with it. String literals and numeric literals are >> syntax too, even though they are values. A keyword, or reserved word, >> is simply something that looks like an identifier but is converted >> into a different token (by the lexer or by something sitting between >> the lexer and the parse) before the parser sees it. > > Let me try a less subjective description. Things like None, 2.3, 'foo', > True are values or "expressions"; I'm not certain exactly what the term > for these is in Python's grammar, but I basically mean something that > can be on the RHS of an assignment.. However, something like 'for' or > 'if' is part of some other grammatical construct, generally a statement > or operator of some kind, so I tend to think of those differently. > > How about "a keyword is an identifier that appears as a literal in the grammar"? regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden ------------------ Asciimercial --------------------- Get on the web: Blog, lens and tag your way to fame!! holdenweb.blogspot.com squidoo.com/pythonology tagged items: del.icio.us/steve.holden/python All these services currently offer free registration! -------------- Thank You for Reading ----------------
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