Description

wnakhleh

opened on Apr 24, 2023

Issue body actions

Bug report

Python removes negative ranges from dictionaries

Example to reproduce:

print({range(16, 1): 0.5, range(32, 16): 0.5})

The expected output:

{range(16, 1): 0.5, range(32, 16): 0.5}

The actual output:

{range(16, 1): 0.5}

Your environment

• CPython versions tested on: 3.10, 3.7.6
• Operating system and architecture: WIN11+linux

Activity

1. wnakhleh

   added

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   on Apr 24, 2023
2. Eclips4 commented on Apr 24, 2023

   

   Eclips4

   on Apr 24, 2023

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   However, this seems interesting:

   >>> a = {range(16, 1): 1}
   >>> a[range(32, 16)] = 2
   >>> a
   {range(16, 1): 2}
3. Eclips4 commented on Apr 24, 2023

   

   Eclips4

   on Apr 24, 2023

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   Python removes negative ranges from dictionaries

   You misunderstood something. Python doesn't remove anything from dictionary.

   hash(range(32, 16)) == hash(range(16, 1))
   > True
   # And there's need a check for objects equality 
   range(32, 16) == range(16, 1)
   > True

   So, after these checks, Python decides to change the value of key.
4. wnakhleh commented on Apr 24, 2023

   

   wnakhleh

   on Apr 24, 2023

   Author

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   Since both are empty ranges...
   Thanks for the clarification

   Reacted by Kirill Podoprigora and Waad Nakhleh
5. wnakhleh

   closed this as completedon Apr 24, 2023

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