CODEWITHSUNDEEP
python
Danijel
Danijel

Reputation: 8600

Python: how to write a 32-bit float number into a file?

This code gives:
TypeError: a bytes-like object is required, not 'float'

if __name__ == '__main__':
    f32_number = float(1)
    with open("test.f32", "wb") as f:
        f.write(f32_number)

How do I write a float 32-bit number into a binary file?

Upvotes: 0

Views: 493

Answers (1)

Jan Christoph Terasa
Jan Christoph Terasa

Reputation: 5935

Convert the number to bytes using struct:

import struct

if __name__ == '__main__':
    f32_number = float(1)
    with open("test.f32", "wb") as f:
        b = struct.pack('f', f32_number)
        f.write(b)

If you want to share files between platforms, be wary of endianness. It will be better to explicitly use > or < in that case.

Upvotes: 2

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