[issue42165] Question about converting numpy float to bytes (bug??)

[hyoxt121]

New submission from hyoxt121 <hyoxt121 at gmail.com>:

Hi! In order to convert numpy float to bytes, we are using tobytes() method:

import pickle
import numpy as np
pickle.loads(np.float64(0.34103))

and the expected result is like below (because np.float64(0.34103) is not bytes objects, appropriate errors are expected)
---------------------------------------------------------------------------
UnpicklingError Traceback (most recent call last)
<ipython-input-19-5c07606a60f1> in <module>
----> 1 pickle.loads(np.float64(0.34103))

UnpicklingError: invalid load key, '\xc1'.


Here we have some questions that some numbers (it is rare) like 0.34104 prints the following result without errors.
pickle.loads(np.float64(0.34104))
=> True

This occurs only when the converted bytes start with b'\x88 (for example 0.04263, 0.08526, 0.11651 ...)
Can anyone answer whether this issue is Python bugs?

Any answer will be highly appreciated.

----------
components: Library (Lib)
messages: 379738
nosy: hyoxt121
priority: normal
severity: normal
status: open
title: Question about converting numpy float to bytes (bug??)
type: behavior
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42165>
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