Работа с CSV в Питоне

Python has useful module named csv to deal with csv files. But recently I faced a problem reading csv files and want to share with you how I get rid of the problem. I wanted to get the data of the first column of my csv file. I tried the following code:

import csv

portfolio = csv.reader(open("portfolio.csv", "rb"))
names = []
for data in portfolio:
    names.append(data[0])
print names

but the output was an empty list ([]) :-(

Then I found the type of portfolio object using print type(portfolio) that the type is '_csv.reader', then I changed my program to the following and got the list :-)

import csv

portfolio = csv.reader(open("portfolio.csv", "rb"))
portfolio_list = []
portfolio_list.extend(portfolio)
names = []
for data in portfolio_list:
    names.append(data[0])
print names


If you have any better idea, please share.

To know more about csv module, http://docs.python.org/lib/module-csv.html

Замечания:
1. Try
portfolio = csv.reader(open("portfolio.csv", "rU"))
It should work

2.
Reading a particular column from a csv file is really useful and worthful. In my project, I also need to write an array of elements into a new column in the existing csv file in Python. Can you please post some information for writing column data into csv file in Python.

Answer
import csv
list = [ x[0] for x in csv.reader(open('x.csv','r')) ]

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