Interesting Problem

[James Matthews]

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people cannot attach your code to your site (IP theft and security risk)

On Wed, Jan 20, 2010 at 8:38 AM, MRAB <python at mrabarnett.plus.com> wrote:

> Victor Subervi wrote:
>
>> Hi;
>> I think I finally have an interesting problem for y'all. I need to import
>> a script from a lower dir, forcing me to change dirs:
>>
>> cwd = os.getcwd()
>> os.chdir('%s/..' % cwd)
>> sys.path.append(os.getcwd())
>> from templateFrame import top, bottom
>> os.chdir(cwd)
>>
>>  There's no need to actually change current directory. Just do this:
>
> sys.path.append(os.path.dirname(os.getcwd()))
>
> from templateFrame import top, bottom
>
>  Because I've found I must do my form evaluations *before* changing dir as
>> above, I am forced to call these values as globals:
>>
>> form = cgi.FieldStorage()
>> store = form.getfirst('store')
>> cat = form.getfirst('cat')
>> id = form.getfirst('id')
>> pkg = form.getfirst('pkg')
>> patientID = form.getfirst('patientID')
>>
>> Now, apparently because of python's problem with globals, when I call "id"
>> as follows:
>>
>> cursor.execute('select ProductID from productsPackages where PackageID=%s'
>> % id)
>>
>> I get the following error:
>>
>> /var/www/html/angrynates.com/cart/Store_frame2.py <
>> http://angrynates.com/cart/Store_frame2.py>
>>
>>  135   cursor.close()
>>  136   bottom()
>>  137
>>  138 Store_frame2()
>>  139
>> Store_frame2 = <function Store_frame2>
>>  /var/www/html/angrynates.com/cart/Store_frame2.py <
>> http://angrynates.com/cart/Store_frame2.py> in Store_frame2()
>>
>>  119     printAProduct()
>>  120   else:
>>  121     cursor.execute('select ProductID from productsPackages where
>> PackageID=%s' % id)
>>  122     for id in [itm[0] for itm in cursor]:
>>  123       printAProduct(id)
>> global cursor = <MySQLdb.cursors.Cursor object>, cursor.execute = <bound
>> method Cursor.execute of <MySQLdb.cursors.Cursor object>>, global id = '1'
>>
>> UnboundLocalError: local variable 'id' referenced before assignment
>>      args = ("local variable 'id' referenced before assignment",)
>>
>> Full code below. Please advise.
>>
>>  Line 121 refers to 'id', but line 122 assigns to 'id' (the 'for' loop).
>
> In a function, if you assign to a variable then that variable defaults
> to being local. You're trying to use the local variable before assigning
> a value to it. Having a local variable called 'id' means that you can't
> refer to the global variable of the same name.
>
> You're also assigning to 'i' on line 113, but not referring to it
> elsewhere in the function.
> --
> http://mail.python.org/mailman/listinfo/python-list
>



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