Using assingment as an operator.

[Terry Reedy]

"Emil S. Hansen" <esh at berlingske.dk> wrote in message
news:pan.2001.10.12.15.07.42.880.11244 at berlingske.dk...
> Hello fellow PP.
>
> I have a simple question. In a program I have a statement like this:
> while re.search("[^a-z0-9.]", domainname = raw_input("Please enter
domainname: ")) != None:
>         print "Error in domainname, please use lovercase letters and
numbers only."

Assuming re and test are correct (not sure are), rewrite as something
like

while 1:
  domainname = raw_input("Please enter domainname: "
  if re.search("[^a-z0-9.]", domainname ) == None: break # correct
test?
  print "Error in domainname, please use lowercase letters and numbers
only."
  # corrected 'lover' to 'lower'

While I once would have written this as you did (in C), I think there
is some virture to having the test condensed to where it can be seen
'all at once' without the assignment interpolated within.

Terry J. Reedy