Wes James
2/18/2010 7:56:00 PM
On Thu, Feb 18, 2010 at 12:32 PM, Wes James <comptekki@gmail.com> wrote:
> On Thu, Feb 18, 2010 at 8:18 AM, Tim Chase
> <python.list@tim.thechases.com> wrote:
>> Wes James wrote:
> <snip>
>
>>
>> Just to add to the list of solutions I've seen, letting the built-in csv
>> module do the heavy lifting:
>>
>> >>> s = "['a','b']"
>> >>> import csv
>> >>> no_brackets = s[1:-1] # s.strip(' \t[]')
>> >>> c = csv.reader([no_brackets], quotechar="'")
>> >>> c.next()
>> ['a', 'b']
Hmm. When I put csv.reader in a class:
import csv
class IS_LIST():
def __init__(self, format='', error_message='must be a list!'):
self.format = format
self.error_message = error_message
def __call__(self, value):
try:
if value=='[]' or value=='':
value=[]
else:
no_brackets = value[1:-1] # s.strip(' \t[]')
c = csv.reader([no_brackets], quotechar="'")
value=c.next()
return (value, None)
except:
return (value, self.error_message)
def formatter(self, value):
return value
I get an error (when I take the "try" out):
AttributeError: 'function' object has no attribute 'reader'
Why?
-wes