How to handle try/exception block in python? -

largest = none smallest = none while true:     num = raw_input("enter number: ")     if num == "done" :         break     if num>largest:             largest=num     if smallest none:             smallest=num     elif num<smallest:             smallest=num        try :        n=float(num)     except:         print "invalid input"     continue         print num  print "maximum", largest print "manimum", smallest 

combining question text , comments, assume wonder why program output erroneous input largest. answer should move try block checking input right before update of largest , smallest. might helpful not use variable n result of conversion, try num = float(num) after checking num "done".

(as homework, not post "solution", leave hints.)