how do i make an array global

[a]

def fn():
for i in range(l)
global count
count[i]= ....

how do i declare count to be global if it is an array

subsequently i should access or define count as an array

error:
global name 'count' is not defined

thanks
-a

[Erik Max Francis]

Re: how do i make an array global

a wrote:
[color=blue]
> def fn():
> for i in range(l)
> global count
> count[i]= ....
>
> how do i declare count to be global if it is an array[/color]

count = [...]

def fn():
global count
for i in range(l):
count[i] = ...

--
Erik Max Francis && max@alcyone.com && http://www.alcyone.com/max/
San Jose, CA, USA && 37 20 N 121 53 W && AIM erikmaxfrancis
Every human being is a problem in search of a solution.
-- Ashley Montagu

[Bruno Desthuilliers]

Re: how do i make an array global

a wrote:[color=blue]
> def fn():
> for i in range(l)[/color]

l is not defined - you should have an error here.
[color=blue]
> global count
> count[i]= ....
>
> how do i declare count to be global if it is an array[/color]

Just like it was an integer
[color=blue]
> subsequently i should access or define count as an array[/color]

You need to define count before.
[color=blue]
> error:
> global name 'count' is not defined[/color]

He...

*but*
You probably should not do that anyway. Globals are *evil*. And
functions modifying globals is the worst possible thing. There are very
few chances you *need* a global here.

Also, and FWIW:
- Python has lists, not arrays (there's an array type in some numerical
package, but that's another beast)
- 'l' is a very bad name
- 'count' is a bad name for a list - 'counts' would be better (when I
see the name 'count', I think of an integer)



--
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in 'onurb@xiludom. gro'.split('@')])"

[Georg Brandl]

Re: how do i make an array global

Erik Max Francis wrote:[color=blue]
> a wrote:
>[color=green]
>> def fn():
>> for i in range(l)
>> global count
>> count[i]= ....
>>
>> how do i declare count to be global if it is an array[/color]
>
> count = [...]
>
> def fn():
> global count
> for i in range(l):
> count[i] = ...
>[/color]

No need for "global" here.

Georg

[Georg Brandl]

Re: how do i make an array global

Bruno Desthuilliers wrote:[color=blue]
> a wrote:[color=green]
>> def fn():
>> for i in range(l)[/color]
>
> l is not defined - you should have an error here.
>[color=green]
>> global count
>> count[i]= ....
>>
>> how do i declare count to be global if it is an array[/color]
>
> Just like it was an integer[/color]

No. If he's only mutating "count", he doesn't need a global
declaration.
[color=blue][color=green]
>> subsequently i should access or define count as an array[/color]
>
> You need to define count before.
>[color=green]
>> error:
>> global name 'count' is not defined[/color]
>
> He...
>
> *but*
> You probably should not do that anyway. Globals are *evil*.[/color]

Do you realize that every variable you set in a module's namespace is a
global when used by a function? Globals are *not* evil.
[color=blue]
> And functions modifying globals is the worst possible thing.
> There are very few chances you *need* a global here.[/color]

Look at the use case first.
For small scripts, sometimes re-assigning global names or mutating objects
refered to by global names is essential. For large-scale packages, though,
I agree with you that mutating globals is bad.

Georg

[Bruno Desthuilliers]

Re: how do i make an array global

Georg Brandl wrote:[color=blue]
> Bruno Desthuilliers wrote:
>[color=green]
>>a wrote:
>>[color=darkred]
>>>def fn():
>>> for i in range(l)[/color]
>>
>>l is not defined - you should have an error here.
>>
>>[color=darkred]
>>> global count
>>> count[i]= ....
>>>
>>>how do i declare count to be global if it is an array[/color]
>>
>>Just like it was an integer[/color]
>
>
> No. If he's only mutating "count", he doesn't need a global
> declaration.[/color]

Did I said so ? I just answered the OP's question. If that's the 'int'
that confuse you, then s/int/dict/ - what I meant is that the global
statement doesn't care about types...
[color=blue]
>[color=green][color=darkred]
>>>subsequent ly i should access or define count as an array[/color]
>>
>>You need to define count before.
>>
>>[color=darkred]
>>>error:
>>>global name 'count' is not defined[/color]
>>
>>He...
>>
>>*but*
>>You probably should not do that anyway. Globals are *evil*.[/color]
>
> Do you realize that every variable you set in a module's namespace is a
> global when used by a function?[/color]

Going to teach me Python, Georg ?-) Then let's be accurate first, and
s/variable you set/name you bind/
[color=blue]
> Globals are *not* evil.[/color]

Yes they are.
[color=blue][color=green]
>>And functions modifying globals is the worst possible thing.
>>There are very few chances you *need* a global here.[/color]
>
> Look at the use case first.[/color]

The use case here is to avoid either passing a list as param or building
and returning it - and the OP is obviously a newbie, so better for him
to learn the RightThing(tm) from the beginning IMHO.
[color=blue]
> For small scripts, sometimes re-assigning global names or mutating objects
> refered to by global names is essential.[/color]

s/is essential/seems easier/

Then you or anyone else has to make a quick fix or update, and
everything starts to break down. Too bad.


--
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in 'onurb@xiludom. gro'.split('@')])"

[Georg Brandl]

Re: how do i make an array global

Bruno Desthuilliers wrote:[color=blue]
> Georg Brandl wrote:[color=green]
>> Bruno Desthuilliers wrote:
>>[color=darkred]
>>>a wrote:
>>>
>>>>def fn():
>>>> for i in range(l)
>>>
>>>l is not defined - you should have an error here.
>>>
>>>
>>>> global count
>>>> count[i]= ....
>>>>
>>>>how do i declare count to be global if it is an array
>>>
>>>Just like it was an integer[/color]
>>
>>
>> No. If he's only mutating "count", he doesn't need a global
>> declaration.[/color]
>
> Did I said so ? I just answered the OP's question. If that's the 'int'
> that confuse you, then s/int/dict/ - what I meant is that the global
> statement doesn't care about types...[/color]

Ok, I misunderstood you.
[color=blue][color=green][color=darkred]
>>>>subsequentl y i should access or define count as an array
>>>
>>>You need to define count before.
>>>
>>>
>>>>error:
>>>>global name 'count' is not defined
>>>
>>>He...
>>>
>>>*but*
>>>You probably should not do that anyway. Globals are *evil*.[/color]
>>
>> Do you realize that every variable you set in a module's namespace is a
>> global when used by a function?[/color]
>
> Going to teach me Python, Georg ?-) Then let's be accurate first, and
> s/variable you set/name you bind/[/color]

Well, thanks. As if that made a difference.
[color=blue][color=green]
>> Globals are *not* evil.[/color]
>
> Yes they are.[/color]

Really? May I tell you that in the stdlib, there are at least 13526 globals
overall?
[color=blue][color=green][color=darkred]
>>>And functions modifying globals is the worst possible thing.
>>>There are very few chances you *need* a global here.[/color]
>>
>> Look at the use case first.[/color]
>
> The use case here is to avoid either passing a list as param or building
> and returning it - and the OP is obviously a newbie, so better for him
> to learn the RightThing(tm) from the beginning IMHO.[/color]

There's no reason to not use a global if it's the easiest thing to do.
[color=blue][color=green]
>> For small scripts, sometimes re-assigning global names or mutating objects
>> refered to by global names is essential.[/color]
>
> s/is essential/seems easier/
>
> Then you or anyone else has to make a quick fix or update, and
> everything starts to break down. Too bad.[/color]

Everything starts to break down? If the change was buggy, it'll be debugged
and corrected. That's nothing particularly related to globals. Remember,
we're talking about one-file scripts here.

Georg

[Erik Max Francis]

Re: how do i make an array global

Georg Brandl wrote:
[color=blue]
> No need for "global" here.[/color]

Yes, that's true. I was just following the original poster's lead, but
I tend to use a `global` statement whenever I'm mutating a global in a
local block. That works as self-documentation and means you don't have
to be concerned about the precise case in which it's required, reducing
bugs when you change a block so that it would have been required if you
hadn't included it.

--
Erik Max Francis && max@alcyone.com && http://www.alcyone.com/max/
San Jose, CA, USA && 37 20 N 121 53 W && AIM erikmaxfrancis
Seriousness is the only refuge of the shallow.
-- Oscar Wilde

[a]

Re: how do i make an array global

hi bruno georg and erik
you are right i m a newbie,
i just want to do some stuff read out some stuff from a feed and
display it in a page, so my py code, builds this list
and when it goes to cheetah it gives me an error and hence i posted
global has fixed the error but
i keep getting this again and again and i dont know why? but if i
refresh the page error goes away and the correct content comes up
please help me out


Traceback (most recent call last):
File "C:\Python24\li b\site-packages\web.py ", line 2054, in
run_wsgi_app
result = self.server.app (env, self.wsgi_start _response)
File "C:\Python24\li b\site-packages\web.py ", line 1894, in wsgifunc
result = func()
File "C:\Python24\li b\site-packages\web.py ", line 1872, in <lambda>
func = lambda: handle(getattr( mod, name), mod)
File "C:\Python24\li b\site-packages\web.py ", line 1051, in handle
return tocall(*([urllib.unquote( x) for x in args] + fna))
File "c:\mark\web1\c ode.py", line 64, in GET
l_code.append( len(d_list_code[i]['entries']) )
IndexError: list index out of range

it goes off when page is refreshed

I m getting the following error, infrequently and if I refresh the
page, it just displays the page properly
I am unable to find the problem. How is this out of range and what
does
the error message mean?

Solution: Remove all .pyc files from you Zope tree and try again:
find <zopedir> -name "*.pyc" | xargs rm

How can we do this when code is running?

----------------------------------------------------------------

Traceback (most recent call last):
File "C:\Python24\li b\site-packages\web.py ", line 2054, in
run_wsgi_app
result = self.server.app (env, self.wsgi_start _response)
File "C:\Python24\li b\site-packages\web.py ", line 1894, in wsgifunc
result = func()
File "C:\Python24\li b\site-packages\web.py ", line 1872, in <lambda>
func = lambda: handle(getattr( mod, name), mod)
File "C:\Python24\li b\site-packages\web.py ", line 1051, in handle
return tocall(*([urllib.unquote( x) for x in args] + fna))
File "c:\usr\code.py ", line 64, in GET
l_code.append( len(d_list_code[i]['entries']) )
IndexError: list index out of range
Erik Max Francis wrote:[color=blue]
> Georg Brandl wrote:
>[color=green]
> > No need for "global" here.[/color]
>
> Yes, that's true. I was just following the original poster's lead, but
> I tend to use a `global` statement whenever I'm mutating a global in a
> local block. That works as self-documentation and means you don't have
> to be concerned about the precise case in which it's required, reducing
> bugs when you change a block so that it would have been required if you
> hadn't included it.
>
> --
> Erik Max Francis && max@alcyone.com && http://www.alcyone.com/max/
> San Jose, CA, USA && 37 20 N 121 53 W && AIM erikmaxfrancis
> Seriousness is the only refuge of the shallow.
> -- Oscar Wilde[/color]

[a]

Re: how do i make an array global

please tell me how to do it if i should not make it global
like you guys worry i m not comfortable making it global and mutating
it in every subblock

thanks for reading and helping out

[Marc 'BlackJack' Rintsch]

Re: how do i make an array global

In <1151553485.378 000.203760@p79g 2000cwp.googleg roups.com>, a wrote:
[color=blue]
> Traceback (most recent call last):
> File "C:\Python24\li b\site-packages\web.py ", line 2054, in
> run_wsgi_app
> result = self.server.app (env, self.wsgi_start _response)
> File "C:\Python24\li b\site-packages\web.py ", line 1894, in wsgifunc
> result = func()
> File "C:\Python24\li b\site-packages\web.py ", line 1872, in <lambda>
> func = lambda: handle(getattr( mod, name), mod)
> File "C:\Python24\li b\site-packages\web.py ", line 1051, in handle
> return tocall(*([urllib.unquote( x) for x in args] + fna))
> File "c:\mark\web1\c ode.py", line 64, in GET
> l_code.append( len(d_list_code[i]['entries']) )
> IndexError: list index out of range
>
> it goes off when page is refreshed
>
> I m getting the following error, infrequently and if I refresh the
> page, it just displays the page properly
> I am unable to find the problem. How is this out of range and what
> does the error message mean?[/color]

The error message means that you try to access a list item that does not
exist::

In [1]: a = [1, 2, 3]

In [2]: a[0]
Out[2]: 1

In [3]: a[1]
Out[3]: 2

In [4]: a[2]
Out[4]: 3

In [5]: a[3]
-------------------------------------------------------------------------
exceptions.Inde xError Traceback (most recent call last)

/home/marc/<ipython console>

IndexError: list index out of range

So from the traceback it seems that `i` has a value that's not between 0
and ``len(d_list_co de)``.

Ciao,
Marc 'BlackJack' Rintsch

[a]

Re: how do i make an array global

i understand index error
but there is no index error in my code that is the problem!
Marc 'BlackJack' Rintsch wrote:[color=blue]
> In <1151553485.378 000.203760@p79g 2000cwp.googleg roups.com>, a wrote:
>[color=green]
> > Traceback (most recent call last):
> > File "C:\Python24\li b\site-packages\web.py ", line 2054, in
> > run_wsgi_app
> > result = self.server.app (env, self.wsgi_start _response)
> > File "C:\Python24\li b\site-packages\web.py ", line 1894, in wsgifunc
> > result = func()
> > File "C:\Python24\li b\site-packages\web.py ", line 1872, in <lambda>
> > func = lambda: handle(getattr( mod, name), mod)
> > File "C:\Python24\li b\site-packages\web.py ", line 1051, in handle
> > return tocall(*([urllib.unquote( x) for x in args] + fna))
> > File "c:\mark\web1\c ode.py", line 64, in GET
> > l_code.append( len(d_list_code[i]['entries']) )
> > IndexError: list index out of range
> >
> > it goes off when page is refreshed
> >
> > I m getting the following error, infrequently and if I refresh the
> > page, it just displays the page properly
> > I am unable to find the problem. How is this out of range and what
> > does the error message mean?[/color]
>
> The error message means that you try to access a list item that does not
> exist::
>
> In [1]: a = [1, 2, 3]
>
> In [2]: a[0]
> Out[2]: 1
>
> In [3]: a[1]
> Out[3]: 2
>
> In [4]: a[2]
> Out[4]: 3
>
> In [5]: a[3]
> -------------------------------------------------------------------------
> exceptions.Inde xError Traceback (most recent call last)
>
> /home/marc/<ipython console>
>
> IndexError: list index out of range
>
> So from the traceback it seems that `i` has a value that's not between 0
> and ``len(d_list_co de)``.
>
> Ciao,
> Marc 'BlackJack' Rintsch[/color]

[Fredrik Lundh]

Re: how do i make an array global

a wrote:
[color=blue]
> i understand index error
> but there is no index error in my code that is the problem![/color]

so who wrote the "c:\mark\web1\c ode.py" file ?
[color=blue][color=green]
> > File "c:\mark\web1\c ode.py", line 64, in GET
> > l_code.append( len(d_list_code[i]['entries']) )
> > IndexError: list index out of range[/color][/color]

maybe you should talk to Mark ?

</F>