Tuple Unpacking in raise

[James Stroud]

Hello All,

Is this a bug? Why is this tuple getting unpacked by raise? Am I missing some 
subtle logic? Why does print not work the same way as raise? Both are 
statements. Why does raise need to be so special?

py> sometup = 1,2
py> print sometup
(1, 2)
py> print 1,2,3, sometup
1 2 3 (1, 2)
py> class MyErr(Exception):
...   def __init__(self, atup):
...     Exception.__init__(self, "Error with %s-%s" % atup)
...
py> raise MyErr, sometup
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: __init__() takes exactly 2 arguments (3 given)
py> e = MyErr(sometup)
py> print e
Error with 1-2

James

-- 
James Stroud
UCLA-DOE Institute for Genomics and Proteomics
Box 951570
Los Angeles, CA 90095

http://www.jamesstroud.com/