multiple parameters in if statement

[John Machin]

On 16/04/2006 10:28 AM, Kun wrote:
> I am trying to make an if-statement that will not do anything and print 
> 'nothing entered' if there is nothing entered in a form.  I have the 
> following code that does that, however, now even if I enter something 
> into the form, the code still outputs 'nothing entered'.  This violates 
> the if statement and I am wondering what I did wrong.
> 
>     if form.has_key("delete_id") and form["delete_id"].value != "" and 

Unless your code needs to run on Python 2.1, consider using the <key> in 
<dict> construct instead of <dict>.has_key(<key>) -- it's not only less 
wear and tear on the the eyeballs and fingers, it's faster.

Python 2.1.3 (#35, Apr  8 2002, 17:47:50) [MSC 32 bit (Intel)] on win32
 >>> foo = {}; foo['bar'] = 'zot'
 >>> foo.has_key('bar')
1
 >>> 'bar' in foo
Traceback (most recent call last):
   File "<stdin>", line 1, in ?
TypeError: 'in' or 'not in' needs sequence right argument
 >>>

Python 2.2.3 (#42, May 30 2003, 18:12:08) [MSC 32 bit (Intel)] on win32
 >>> foo = {}; foo['bar'] = 'zot'
 >>> foo.has_key('bar')
1
 >>> 'bar' in foo
1
 >>>