如何在此文件的第4个元素之后将输出附加到txt文件 [英] How to append an output to a txt file after every 4th element in this file

问题描述

很抱歉，但是我是Python的新手，并且我有包含此类数据的文件

I am sorry but I am new in Python and I have file which have data like this

x1 y1 z1 w1 x2 y2 z2 w2 .. xn yn zn wn

我想在每w之后附加一些数字.因此基本上是在txt文件中的第4个元素之后.

I would like to append some number after every w. so basically after every 4th element in the txt file.

请问有什么建议吗? 非常感谢

Is there any recommendations please? Thanks a lot

更新:txt文件中的数据均为字符串. 我能够将它们转换

Update : The data which is in the txt file are all strings. I was able to convert them

f = open("test.txt","r+").readlines()
for line in f:
    tmp = line.strip().split(",")
    values = [float(v) for v in tmp]
    my_data = [1 1 2 23 1]
    a = np.insert(a,slice(0,None,4),my_data)  
    np.savetxt(filename, a)

附加部分仍无法正常工作.

The appending part didn't work still.

推荐答案

您必须首先将此文件读入数组，插入项目并将其保存回去(假设文本文件的名称为filename):

You have to first read this file into an array, insert items and save it back (assuming your text file's name is filename):

import numpy as np
your_number = #number you want to insert OR a list of numbers you want to insert consecutively in those locations
a = numpy.loadtxt(filename)
a = np.insert(a,slice(0,None,4),your_number)
np.savetxt(filename, a)

示例:

a = np.zeros(10)
#[0. 0. 0. 0. 0. 0. 0. 0. 0. 0.]
l = [1,2,3]
a = np.insert(a,slice(0,None,4),l)

输出

[1. 0. 0. 0. 0. 2. 0. 0. 0. 0. 3. 0. 0.]

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