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

[hyoxt121]

New submission from hyoxt121 :

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

[hyoxt121]

hyoxt121  added the comment:

If so, regardless of invalid operation, can anyone explain why 
"pickle.loads(np.float64(0.34104))" prints "True"?

--

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[issue42168] Question about deserializing some numbers (bug??)

[hyoxt121]

New submission from hyoxt121 :

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)
 in 
> 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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[issue42165] closed (reopen with other issue)

[hyoxt121]

Change by hyoxt121 :


--
title: Question about converting numpy float to bytes (bug??) -> closed (reopen 
with other issue)

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

[hyoxt121]

hyoxt121  added the comment:

I will close and reopen again with some modification.

--
stage:  -> resolved
status: open -> closed

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[issue42168] Question about deserializing some numbers (bug??)

[hyoxt121]

hyoxt121  added the comment:

Can anyone explain "pickle.loads(np.float64(0.34104))" prints "True"?

--

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