help with a function

**Ben Finney** · May 17 '06, 02:35 AM

Re: help with a function

Lance Hoffmeyer <lance@augustma il.com> writes:
[color=blue]
> def even_odd_round( num):
> if(round(num,2) + .5 == int(round(num,2 )) + 1):
> if(int(num,0) % 2): #an odd number
> rounded_num = round(num,2) + .1
> else: #an even number
> rounded_num = round(num,2) - .1
> rounded_num = int(rounded_num )
> return rounded_num
>
> even_odd_round( 5.5)
>
> Traceback (most recent call last):
> File "<interacti ve input>", line 1, in ?
> File "<interacti ve input>", line 3, in even_odd_round
> TypeError: int() can't convert non-string with explicit base[color=green][color=darkred]
> >>>[/color][/color][/color]

Two problems.

One is the simple fact reported by the error message: you're
attempting to specify that a number object (already represented inside
Python as a number) should be converted using a particular base. (Why
you've chosen 0 as the base is beyond me.)

That only makes sense with a string of digit characters, where Python
needs to be told what numeric base each digit is (decimal, octal,
hexadecimal, whatever). It makes no sense for objects that are already
numbers, since they're not represented as digits in a base.

The other problem is specifying a base at all. Why not just convert
the object to an int using the default base?

If you're confused about how built-in types or functions work, you
should become familiar with the help system in the interpreter:

help(int)

--
\ "Any sufficiently advanced bug is indistinguishab le from a |
`\ feature." -- Rich Kulawiec |
_o__) |
Ben Finney

**Paul McGuire** · May 17 '06, 02:35 AM

Re: help with a function

"Lance Hoffmeyer" <lance@augustma il.com> wrote in message
news:446a85c6$0 $61170$ae4e5890 @news.nationwid e.net...[color=blue]
> Hey all,
>
> I'm new to python. I keep getting an error when running this.
> I'm sure there is an easy fix but I can't figure it out.
> What am I doing wrong? How do I fix it?
>
> def even_odd_round( num):
> if(round(num,2) + .5 == int(round(num,2 )) + 1):
> if(int(num,0) % 2): #an odd number
> rounded_num = round(num,2) + .1
> else: #an even number
> rounded_num = round(num,2) - .1
> rounded_num = int(rounded_num )
> return rounded_num
>
> even_odd_round( 5.5)
>
> Traceback (most recent call last):
> File "<interacti ve input>", line 1, in ?
> File "<interacti ve input>", line 3, in even_odd_round
> TypeError: int() can't convert non-string with explicit base[color=green][color=darkred]
> >>>[/color][/color][/color]

1 def even_odd_round( num):
2 if(round(num,2) + .5 == int(round(num,2 )) + 1):
3 if(int(num,0) % 2): #an odd number
4 rounded_num = round(num,2) + .1
5 else: #an even number
6 rounded_num = round(num,2) - .1
7 rounded_num = int(rounded_num )
8 return rounded_num
9
10 even_odd_round( 5.5)
[color=blue]
> Traceback (most recent call last):
> File "<interacti ve input>", line 1, in ?
> File "<interacti ve input>", line 3, in even_odd_round
> TypeError: int() can't convert non-string with explicit base[/color]

This

**Paul McGuire** · May 17 '06, 02:55 AM

Re: help with a function

"Paul McGuire" <ptmcg@austin.r r._bogus_.com> wrote in message
news:mYvag.3795 2$CH2.9832@torn ado.texas.rr.co m...[color=blue]
> "Lance Hoffmeyer" <lance@augustma il.com> wrote in message
> news:446a85c6$0 $61170$ae4e5890 @news.nationwid e.net...[color=green]
> > Hey all,
> >
> > I'm new to python. I keep getting an error when running this.
> > I'm sure there is an easy fix but I can't figure it out.
> > What am I doing wrong? How do I fix it?
> >
> > def even_odd_round( num):
> > if(round(num,2) + .5 == int(round(num,2 )) + 1):
> > if(int(num,0) % 2): #an odd number
> > rounded_num = round(num,2) + .1
> > else: #an even number
> > rounded_num = round(num,2) - .1
> > rounded_num = int(rounded_num )
> > return rounded_num
> >
> > even_odd_round( 5.5)
> >
> > Traceback (most recent call last):
> > File "<interacti ve input>", line 1, in ?
> > File "<interacti ve input>", line 3, in even_odd_round
> > TypeError: int() can't convert non-string with explicit base[color=darkred]
> > >>>[/color][/color]
>
> 1 def even_odd_round( num):
> 2 if(round(num,2) + .5 == int(round(num,2 )) + 1):
> 3 if(int(num,0) % 2): #an odd number
> 4 rounded_num = round(num,2) + .1
> 5 else: #an even number
> 6 rounded_num = round(num,2) - .1
> 7 rounded_num = int(rounded_num )
> 8 return rounded_num
> 9
> 10 even_odd_round( 5.5)
>[color=green]
> > Traceback (most recent call last):
> > File "<interacti ve input>", line 1, in ?
> > File "<interacti ve input>", line 3, in even_odd_round
> > TypeError: int() can't convert non-string with explicit base[/color]
>[/color]

This error message tells us there is a problem on line 3, something to do
with the int() method call.

You have posted a number of posts this week, and it feels like you write a
bunch of code, run into a problem, then post it without trying to figure it
out. I don't mean to offend, but really, many of your questions are pretty
basic:
- how do I use regex's (to extract data from an easily split string of
space-delimited numbers)?
- how do I round a number?
- I get this traceback, what's wrong with my program?
Please read up on the Python tutorials, and learn how to use the interactive
help.

Overall, c.l.py is pretty newbie-friendly, and a "n00b" question every so
often is no big deal - but you've got to make more of an effort yourself.
There is also a tutorial mailing list that is - I started to say "more
geared for beginners", but we have plenty of lurker beginners on c.l.py, I'm
sure - I'd say the tutorial mailing list is more willing to handhold new
Python programmers.

And a posted "thanks" once in a while is not bad etiquette either.

-- Paul

help with a function

help with a function

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