python-2.7 - 如何将字符串列表从 csv 文件转换为 float ？

Question

我正在尝试将 csv 文件作为这样的矩阵读取:

import csv
with open("data.csv", "r") as file:
    table = [line for line in csv.reader(file)]
    for line in table:
        print(line)

但是，我需要将列表的内容转换为浮点数。我试图转换为 float 使用

table = [int(x) for x in table]

但是这是一个错误

TypeError: int() argument must be a string or a number, not 'list'

如何解决这个问题？

Answer 1

下面是一个简单的例子，如何将每行数据转换为float数字类型并做一些计算:

假设 CSV 数据文件 data.csv充满了一些ints和 floats :

12,13,14,15,16
0.1,0.2,0.3,0.4,0.5

import csv
with open("./data.csv", "rU") as file:
    table = [line for line in csv.reader(file)]
    for line in table:
        numbers = [ float(x) for x in line ]
        sum = 0
        for number in numbers:
            sum = sum + number
        print(numbers)
        print "The sum of numbers is: ", sum

输出:

[12.0, 13.0, 14.0, 15.0, 16.0]
The sum of numbers is:  70.0
[0.1, 0.2, 0.3, 0.4, 0.5]
The sum of numbers is:  1.5