Is it possible to load a C binary-saved array into a Python array?

Question

I have a file where I have saved C float arrays as binary data. Is it possible to load this binary data into a Python list now?

Thank you. Sorry for my ignorance. I did try to search in various ways and formats 'how to read bindary array data from a file' but came out empty-handed — Jack Avante
– Jack Avante, Commented Nov 8, 2019 at 18:57
What I mean is.. say we have a C array: float arr[] We save that array into a file as binary data Now in Python, we open this file, and read the binary data into an array my_array = array_from_file() — Jack Avante
– Jack Avante, Commented Nov 8, 2019 at 19:09
@JackAvante that doesn't answer my question at all. What exactly do you mean by array in Python? Do you mean an array from the array module? Or do you mean a numpy.ndarray? Or perhaps you just meant a Python list? Generally, "array" in Python means a numpy.ndarray or people from some other language incorrectly calling a list an array. Rarely, but possibly, they mean array.array. So, which one do you mean? — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Nov 8, 2019 at 19:18

tfmoraes · Accepted Answer · 2019-11-08 19:35:06Z

4

It's possible to do that using Numpy.memmap. Something like this:

import numpy as np
arr = np.memmap("filename", dtype="int32", mode="r")

Replace "filename" with the path to your array file and "int32" with the type you used in your C array.

answered Nov 8, 2019 at 19:35

tfmoraes

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