这是最简单的方法:

import csv
with open('testfile.csv', newline='') as csvfile:
    data = list(csv.reader(csvfile))

现在数据中的每个条目都是一个记录，表示为一个数组。你有一个二维数组。这节省了我很多时间。

可在最新的熊猫和numpy版本。

import pandas as pd
import numpy as np

data = pd.read_csv('data.csv', header=None)

# Discover, visualize, and preprocess data using pandas if needed.

data = data.to_numpy()

In [329]: %time my_data = genfromtxt('one.csv', delimiter=',')
CPU times: user 19.8 s, sys: 4.58 s, total: 24.4 s
Wall time: 24.4 s

In [330]: %time df = pd.read_csv("one.csv", skiprows=20)
CPU times: user 1.06 s, sys: 312 ms, total: 1.38 s
Wall time: 1.38 s

我试了一下:

import pandas as p
import numpy as n

closingValue = p.read_csv("<FILENAME>", usecols=[4], dtype=float)
print(closingValue)

当我尝试使用NumPy和Pandas两种方式时，使用Pandas有很多优点:

快 减少CPU占用 与NumPy genfromttxt相比，RAM占用了1/3

这是我的测试代码:

$ for f in test_pandas.py test_numpy_csv.py ; do  /usr/bin/time python $f; done
2.94user 0.41system 0:03.05elapsed 109%CPU (0avgtext+0avgdata 502068maxresident)k
0inputs+24outputs (0major+107147minor)pagefaults 0swaps

23.29user 0.72system 0:23.72elapsed 101%CPU (0avgtext+0avgdata 1680888maxresident)k
0inputs+0outputs (0major+416145minor)pagefaults 0swaps

test_numpy_csv.py

from numpy import genfromtxt
train = genfromtxt('/home/hvn/me/notebook/train.csv', delimiter=',')

test_pandas.py

from pandas import read_csv
df = read_csv('/home/hvn/me/notebook/train.csv')

数据文件:

du -h ~/me/notebook/train.csv
 59M    /home/hvn/me/notebook/train.csv

在NumPy和熊猫版本:

$ pip freeze | egrep -i 'pandas|numpy'
numpy==1.13.3
pandas==0.20.2

使用numpy.loadtxt

一个非常简单的方法。但它要求所有元素都是float (int等)

import numpy as np 
data = np.loadtxt('c:\\1.csv',delimiter=',',skiprows=0)