I donä't get while-loops

[Larry Bates]

ssecorp wrote:
> in read2 it never quits when I write quit, why?
> 
> def read():
>     expr = raw_input("Lisp> ")
>     if expr != "quit":
>         print parse(expr)
>         read()
>     else:
>         print "Good session!"
> 
> def read2():
>     expr = ""
>     while expr != "quit":
>         expr = raw_input("Lisp> ")
>         print parse(expr)
>         read2()
>     print "Good session!"

That's because read2() is being called recursively making expr be always a blank 
string the first time you go through the loop.  Delete the call to read2() that 
is inside your while loop and try.

-Larry