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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() The error that I got is something about the type of the error
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
This error doesn't occur in python2 so I am wondering what the issue could be. Can anyone help me out?
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The NumPy module savetxt() method is used to append the Numpy array at the end of the existing csv file with a single format pattern fmt = %s.
Let us see how to save a numpy array to a text file. Creating a text file using the in-built open() function and then converting the array into string and writing it into the text file using the write() function. Finally closing the file using close() function.
fmtstr or sequence of strs, optional. A single format (%10.5f), a sequence of formats, or a multi-format string, e.g. 'Iteration %d – %10.5f', in which case delimiter is ignored. For complex X, the legal options for fmt are: a single specifier, fmt='%. 4e', resulting in numbers formatted like ' (%s+%sj)' % (fmt, fmt)
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() 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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