python3-numpy:使用numpy savetxt附加到文件 [英] python3-numpy: Appending to a file using numpy savetxt

问题描述

我正在尝试使用numpy的savetxt函数将数据追加到文件中.下面是最小的工作示例

I am trying to append data to a file using numpy's savetxt function. Below is the minimum working example

#!/usr/bin/env python3
import numpy as np
f=open('asd.dat','a')
for iind in range(4):
    a=np.random.rand(10,10)
    np.savetxt(f,a)
f.close()

我得到的错误与错误的类型有关

The error that I got is something about the type of the error

文件"/usr/lib/python3/dist-packages/numpy/lib/npyio.py"，第1073行， 在savetxt中 fh.write(asbytes(format％tuple(row)+ newline))TypeError:必须为str，而不是字节

File "/usr/lib/python3/dist-packages/numpy/lib/npyio.py", line 1073, in savetxt fh.write(asbytes(format % tuple(row) + newline)) TypeError: must be str, not bytes

此错误在python2中不会发生，所以我想知道可能是什么问题.有人可以帮我吗?

This error doesn't occur in python2 so I am wondering what the issue could be. Can anyone help me out?

推荐答案

您应通过二进制模式打开文件.

You should open file by binary mode.

#!/usr/bin/env python3
import numpy as np        
f=open('asd.dat','ab')
for iind in range(4):
    a=np.random.rand(10,10)
    np.savetxt(f,a)
f.close()

参考: python-如何将一个numpy数组写入csv文件? -堆栈溢出如何将numpy数组写入csv文件?

reference: python - How to write a numpy array to a csv file? - Stack Overflow How to write a numpy array to a csv file?

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