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xrange fails to overflow? about intelhex HOT 3 CLOSED

python-intelhex commented on September 28, 2024

xrange fails to overflow?

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Comments (3)

bialix commented on September 28, 2024 1

Yes, my guess about your system was right. I suppose that's somehow related to your compiler and/or OS system libs.

I can only put additional check in the tests to skip tests if type(1<<32) is not long.

Would you like to provide a patch?

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bialix commented on September 28, 2024

Thank you for reporting this.

This error is harmless, and only indicates that my assumptions about xrange behavior is not quite correct on your system. I'd suspect that's due 64-bit platform, but on with 64-bit Windows build of Python 2.7.13 - I still get OverflowError with my original statement.

Can you check on your python what's the result of the following expression:

type(2684625744)

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mt-caret commented on September 28, 2024

$ python
Python 2.7.13 (default, Dec 17 2016, 20:05:07) 
[GCC 5.4.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> type(2684625744)
<type 'int'>

Looks like I start getting 'long's from 1 << 63:

$ python                                                                                                
Python 2.7.13 (default, Dec 17 2016, 20:05:07)                                                                       
[GCC 5.4.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> type(1<<32)                                                                                                      
<type 'int'>                                                                                                         
>>> type(1<<62)                                                                                                      
<type 'int'>                                                                                                         
>>> type(1<<63)                                                                                                      
<type 'long'>                                                                                                        
>>>

My machine is running on Linux x86_64 (NixOS), if that helps

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