如何从python中的文本文件中获取浮点数？

Question

Hi I am new to python and I have a textfile .txt with the following structure:

Text1     31332.22342
Text2     293023.32323
Text3     32332.32323

What is the easiest way to get those numbers into an array? Cheers!

Answer 1

You can read the file and split it into aa list, then iterate through the list and try to convert to a float, if its successful then add it to the floats list. like the following:

    with open('file.txt', 'r') as f:
        data = f.read().split()
        floats = []
        for elem in data:
            try:
                floats.append(float(elem))
            except ValueError:
                pass
        print floats

output:

[31332.22342, 293023.32323, 32332.32323]

Answer 2

You also can use numpy genfromtxt function. something like this:

text_file.txt

Text1     31332.22342
Text2     293023.32323
Text3     32332.32323

python shell

>>> import numpy as np
>>> numbers = np.genfromtxt('text_file.txt', usecols=1 )

output

[  31332.22342  293023.32323   32332.32323]

Answer 3

To get propert validation of your data type try this:

import numpy as np
data = np.genfromtxt("test.txt", usecols=1, dtype=float)

Output:

[  31332.22342  293023.32323   32332.32323]