"a better input"

[David LeBlanc]

Has "self" become "this" in cvs? ;->

True and false are released in 2.2.1

David LeBlanc
Seattle, WA USA 

> -----Original Message-----
> From: python-list-admin at python.org
> [mailto:python-list-admin at python.org]On Behalf Of Andrew Dalke
> Sent: Thursday, May 09, 2002 9:59
> To: python-list at python.org
> Subject: Re: "a better input"
> 
> 
> Alex:
> > def isThisAComplexLiteral(this):
> >     try: complex(this)
> >     except: return False
> >     else: return True
> 
> Minor point.  "except ValueError:" instead of "except:" as in
> 
> try:
>   complex(this)
> except ValueError:
>   return False
> else:
>   return True
> 
> > Of course, the real approach is less silly:
> >
> > def cooked_input(astr=None):
> >     if astr=None: astr=raw_input
> >     for atype in int, long, float, complex:
> >         try: return atype(astr)
>           except ValueError: pass   # I changed this line
> >     else:
> >         return astr
> 
> There may be some exceptions those throw besides ValueError,
> but I don't know of any, and I just scanned floatobject.c and
> intobject.c to veriy those cases.
> 
> My worry about "except:" is that it ignores KeyboardInterrupt
> (if done at just the right/wrong time) and gives false results
> for typos, like
> 
>   complx(s)
> 
> (raises a NameError, which is caught by the exception and turned
> into a False.  It's catchable in testing, but not as easy to
> identify as a traceback which points out the error location.
> 
>                     Andrew
>                     dalke at dalkescientific.com
> P.S.
>   And 'True' and 'False'?  Nothing like cutting edge CVS Python :)
> 
> 
> 
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