[Tutor] 'function' object has no attribute 'writer'

[Susana Iraiis Delgado Rodriguez]

I want to write a csv file, but I need the final user to give me some values
to open and update the file. My code is:
from Tkinter import * #Llamo las librerias graficas de Tk
import tkSimpleDialog #Libreria de almacenamiento de dialogos
import tkMessageBox #Libreria de mensajes
import tkFileDialog
import sys, os, csv, time, socket, stat
from osgeo import ogr,gdal,osr
from osgeo.gdalconst import *
from PIL import Image
dir = ""
extn = ""
csv_name = ""
def directorio():
 global dir
 print 'Seleccione directorio donde empezar'
 dirname =
tkFileDialog.askdirectory(parent=root,initialdir="/",title='Selecciona la
ruta a escanear')
 if len(dirname ) > 0:
  print "You chose %s" % dirname
 dir = dirname
def extension():
 global extn
 print "Escribe la extension que necesitas buscar"
 ext=tkSimpleDialog.askstring('Extension a buscar:','')
 print 'Buscando archivos: ',ext
 extn = ext
def csv():
 global csv_name
 print "Nombre del csv a crear"
 inv=tkSimpleDialog.askstring('Nombre de .csv:','')
 print 'Archivo de salidad: ',inv
 csv_name = inv
def boton4():
 print 'Iniciando...'
 gdal.AllRegister()
 file_list = []
 folders = None
 for root, folders, files in os.walk(dir):
  file_list.extend(os.path.join(root,fi) for fi in files if
fi.endswith(extn))
 f = open(csv_name, 'wb')
 log = open ('log_errores.txt','w')
 writer = csv.writer(f)
....... more code
But when I run it,console shows:
Python 2.6.6 (r266:84297, Aug 24 2010, 18:46:32) [MSC v.1500 32 b
win32
Type "help", "copyright", "credits" or "license" for more informa
>>> import win
>>> Seleccione directorio donde empezar
You chose C:/
Escribe la extension que necesitas buscar
Buscando archivos:  .shp
Nombre del csv a crear
Archivo de salidad:  gui.csv
Iniciando...
Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Python26\lib\lib-tk\Tkinter.py", line 1410, in __call_
    return self.func(*args)
  File "win.py", line 43, in boton4
    writer = csv.writer(open(csv_name, 'w'))
AttributeError: 'function' object has no attribute 'writer'
I read a tutorial and csv has a writer function, I'm lost
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