Compound Assignment Operators ( +=, *=, etc...)

[Fred L. Drake, Jr.]

In comp.lang.python, 
    Timothy R Evans <tre17 at pc142.cosc.canterbury.ac.nz> writes:
 >def wibble():
 >    print x
 >    x = 6 # this fails with NameError
 >
 >Seems like a good behaviour as it stops you doing dumb things.

Tom Christiansen writes:
 > Perhaps it could give a better error message, pretty please?  Sometimes
 > driving Python feels  like driving Ken Thompson's car.  It just keeps saying
 > "?" and you're expected to know what that means.  :-(

  Current behavior (1.5.2 as released) raises UnboundLocalError (a
subclass of NameError), which is much more informative and is usually
exactly what is needed to point out to the programmer where the coding 
error is.


  -Fred

--
Fred L. Drake, Jr.	     <fdrake at acm.org>
Corporation for National Research Initiatives