what's this instance?

[J. Peng]

def safe_float(object):
try:
retval = float(object)
except (ValueError, TypeError), oops:
retval = str(oops)
return retval

x=safe_float([1,2,3,4])
print x
The code above works well.But what's the instance of "oops"? where is it
coming from? I'm totally confused on it.thanks.

[Marc 'BlackJack' Rintsch]

On Tue, 22 Jan 2008 15:36:49 +0800, J. Peng wrote:

def safe_float(object):
try:
retval = float(object)
except (ValueError, TypeError), oops:
retval = str(oops)
return retval

x=safe_float([1,2,3,4])
print x
The code above works well.But what's the instance of "oops"? where is it
coming from? I'm totally confused on it.thanks.

`oops` is bound to the `ValueError` or `TypError` object if `float()`
raises such an exception.

Ciao,
Marc 'BlackJack' Rintsch

[Bruno Desthuilliers]

J. Peng a ¨¦crit :

def safe_float(object):
try:
retval = float(object)
except (ValueError, TypeError), oops:
retval = str(oops)
return retval

The code above works well.

For which definition of "works well" ?

This function is really ill-named - it returns either a float or a
string, so it is definitively not safe :

def dosomething(x):
return x + (x / 0.5)

x=safe_float([1,2,3,4])
// a dozen line of code here
y = dosomething(x)

And now, have fun trying to trace the real problem... Better to not use
this function at all IMHO - at least, you'll get a meaningfull traceback.

But what's the instance of "oops"? where is it
coming from? I'm totally confused on it.thanks.

cf other answers on this.

[J. Peng]

Bruno Desthuilliers дµÀ:

J. Peng a ¨¦crit :

>def safe_float(object):
try:
retval = float(object)
except (ValueError, TypeError), oops:
retval = str(oops)
return retval

>The code above works well.

For which definition of "works well" ?

I got it from Core Python Programming book I bought.You may ask it to
Westley Chun.:)

[Bruno Desthuilliers]

J. Peng a ¨¦crit :

Bruno Desthuilliers дµÀ:

>J. Peng a ¨¦crit :

>>def safe_float(object):
try:
retval = float(object)
except (ValueError, TypeError), oops:
retval = str(oops)
return retval
The code above works well.

For which definition of "works well" ?

I got it from Core Python Programming book I bought.You may ask it to
Westley Chun.:)

Ok: Mr Chun, if you here us ?-)