Python 使用 numpy 将矩阵附加到现有文件
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Appending a matrix to an existing file using numpy
提问by user2596825
I'm trying to add a matrix to an existing csv file. Following thislink, I wrote the following code,
我正在尝试将矩阵添加到现有的 csv 文件中。按照这个链接，我写了下面的代码，
f_handle = file(outfile+'.x.betas','a')
np.savetxt(f_handle,dataPoint)
f_handle.close()
where I have imported numpy as np, i.e.
我将 numpy 作为 np 导入的地方，即
import numpy as np
But I get this error:
但我收到此错误：
f_handle = file(outfile+'.x.betas','a')
TypeError: 'str' object is not callable
f_handle = file(outfile+'.x.betas','a')
TypeError: 'str' 对象不可调用
I can't figure out what the problem seems to be. Please help :)
我无法弄清楚问题似乎是什么。请帮忙 ：）
回答by Bitwise
Change file()to open(), that should solve it.
更改file()到open()，应该解决这个问题。
回答by unutbu
It looks like you might have defined a variable named filewhich is a string. Python then complains that strobjects are not callable when it encounters
看起来您可能定义了一个名为file字符串的变量。Python然后抱怨str对象在遇到时不可调用
file(...)
You can avoid the issue by, as Bitwise says, changing fileto open.
正如 Bitwise 所说，您可以通过更改file为open.
You could also avoid the problem by not naming a variable file.
您还可以通过不命名变量来避免该问题file。
Nowadays, the best way to open a file is by using a with-statement:
如今，打开文件的最佳方式是使用with-statement：
with open(outfile+'.x.betas','a') as f_handle:
np.savetxt(f_handle,dataPoint)
This guarantees that the file is closed when Python leaves the with-suite.
这保证了当 Python 离开with-suite时文件被关闭。
