string to integer problem

**Diez B. Roggisch** · Jul 18 '05, 08:16 AM

Re: string to integer problem

> I'm currently having problems with data returned from a MySQL database in[color=blue]
> as much as the data returned is of the form '(1,10,23,33,35 ,48)' i.e. a
> list variable holding 6 integers returned as a string.[/color]
[color=blue][color=green][color=darkred]
>>> s = '(1,10,23,33,35 ,48)'
>>> t = eval(s)
>>> print t[/color][/color][/color]
(1,10,23,33,35, 48)

--
Regards,

Diez B. Roggisch

**Peter Otten** · Jul 18 '05, 08:16 AM

Re: string to integer problem

Lol McBride wrote:
[color=blue]
> I'm currently having problems with data returned from a MySQL database in
> as much as the data returned is of the form '(1,10,23,33,35 ,48)' i.e. a
> list variable holding 6 integers returned as a string.
> I can't seem to get around how to return the data to it's original format
> i.e. the list with 6 integers - I have tried slicing the string and[/color]
[color=blue][color=green][color=darkred]
>>> s = '(1,10,23,33,35 ,48)'
>>> [int(n) for n in s[1:-1].split(",")][/color][/color][/color]
[1, 10, 23, 33, 35, 48]

Peter

**Lol McBride** · Jul 18 '05, 08:16 AM

Re: string to integer problem

On Sun, 08 Feb 2004 16:29:14 +0000, Lol McBride wrote:
[color=blue]
> Hi all,
> I'm currently having problems with data returned from a MySQL database in
> as much as the data returned is of the form '(1,10,23,33,35 ,48)' i.e. a
> list variable holding 6 integers returned as a string.
> I can't seem to get around how to return the data to it's original format
> i.e. the list with 6 integers - I have tried slicing the string and
> converting the charachters individually but then I run into trouble when I
> have integers over two digits wide as I can't combine the two separate
> digits back into the original number.
> I feel sure that someone has come across this before and I hope that my
> request for help on this will be answered.
> Thanks ,
> Lol McBride[/color]
Thank you for your replies - your help is very much appreciated.

**Lol McBride** · Jul 18 '05, 08:16 AM

Re: string to integer problem

On Sun, 08 Feb 2004 18:00:11 +0100, Diez B. Roggisch wrote:
[color=blue][color=green]
>> I'm currently having problems with data returned from a MySQL database in
>> as much as the data returned is of the form '(1,10,23,33,35 ,48)' i.e. a
>> list variable holding 6 integers returned as a string.[/color]
>[color=green][color=darkred]
>>>> s = '(1,10,23,33,35 ,48)'
>>>> t = eval(s)
>>>> print t[/color][/color]
> (1,10,23,33,35, 48)[/color]
Hi,
thanks for this it worked a treat but I don't understand how - even after
reading the docs for the eval() builtin function.Could you explain what's
going on (in fairly simple terms as well - I'm a programmer for fun not
cause it's my job)
Thank you,
Lol

**Diez B. Roggisch** · Jul 18 '05, 08:16 AM

Re: string to integer problem

> Hi,[color=blue]
> thanks for this it worked a treat but I don't understand how - even after
> reading the docs for the eval() builtin function.Could you explain what's
> going on (in fairly simple terms as well - I'm a programmer for fun not
> cause it's my job)
> Thank you,
> Lol[/color]

eval is a function that simply evaluates the expression you pass to it as
string - so

eval("10 + 20")

yields 30. You could think of eval beeing a call to something that starts
the python interpreter as separete process/program, passes its arg as the
script to execute, and returns the computed result - thats it.

--
Regards,

Diez B. Roggisch

**Rich Krauter** · Jul 18 '05, 08:16 AM

Re: string to integer problem

On Sun, 2004-02-08 at 11:29, Lol McBride wrote:[color=blue]
>I can't seem to get around how to return the data to it's original
>format
> i.e. the list with 6 integers - I have tried slicing the string and
> converting the charachters individually but then I run into trouble[/color]
when I[color=blue]
> have integers over two digits wide as I can't combine the two separate
> digits back into the original number.[/color]

[color=blue][color=green][color=darkred]
>>> l = '(1,10,23,33,35 ,48)'
>>> [int(x) for x in l[1:-1].split(',')][/color][/color][/color]
[1, 10, 23, 33, 35, 48]

Probably not the best way, but it seems to work.

Rich

**Gerrit** · Jul 18 '05, 08:16 AM

Re: string to integer problem

Lol McBride wrote:[color=blue]
> On Sun, 08 Feb 2004 18:00:11 +0100, Diez B. Roggisch wrote:[color=green][color=darkred]
> >>>> s = '(1,10,23,33,35 ,48)'
> >>>> t = eval(s)
> >>>> print t[/color]
> > (1,10,23,33,35, 48)[/color]
> Hi,
> thanks for this it worked a treat but I don't understand how - even after
> reading the docs for the eval() builtin function.Could you explain what's
> going on (in fairly simple terms as well - I'm a programmer for fun not
> cause it's my job)[/color]

Passing a string to 'eval' is equal in having it as a part of an
expression, for example as having in at the right side of an assignment
operator (=), except for the quotes. The string returned happens to be
valid Python syntax: numbers seperated by comma's with ( and ) around it
create a tuple. It is valid to simply onter (1,2,3) at the Python
interactive interpreter: this is why it is valid to pass '(1,2,3)' to
eval. The result is the same.

Hope this helps,
yours,
Gerrit.

--
PrePEP: Builtin path type

http://people.nl.linux.org/~gerrit/creaties/path/pep-xxxx.html

Asperger's Syndrome - a personal approach:

http://people.nl.linux.org/~gerrit/english/

**Anton Vredegoor** · Jul 18 '05, 08:16 AM

Re: string to integer problem

Lol McBride <newspost@lolmc .com> wrote:
[color=blue]
>thanks for this it worked a treat but I don't understand how - even after
>reading the docs for the eval() builtin function.Could you explain what's
>going on (in fairly simple terms as well - I'm a programmer for fun not
>cause it's my job)[/color]

Sorry, but programmers for fun are expected to do better than
microslaves! Resist this professional nonsense.

Anton

string to integer problem

string to integer problem

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment