[New-bugs-announce] [issue42168] Question about deserializing some numbers (bug??)

[hyoxt121]

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

Hi! In order to deserialize bytes object, we use pickle.loads():

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 ...)
np.float64(0.34104).tobytes()
=> b'\x88.\xa8o\x99\xd3\xd5?'
Can anyone answer whether this issue is Python bugs?

Any answer will be highly appreciated.

----------
components: Library (Lib)
messages: 379750
nosy: hyoxt121
priority: normal
severity: normal
status: open
title: Question about deserializing some numbers (bug??)
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42168>
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