Implement assignment expressions (a.k.a. named expressions a.k.a. walrus operator) #6797

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1. gvanrossum

   added

   feature

   on May 7, 2019
2. emmatyping

   added

   priority-1-normal

   on May 7, 2019
3. msullivan commented on Jul 31, 2019

   

   msullivan

   on Jul 31, 2019

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   There was somebody who expressed interest in implementing this but I'm not sure if anything came of it. Was it @JelleZijlstra?
4. msullivan

   added

   priority-0-high

   and removed

   priority-1-normal

   on Jul 31, 2019
5. JelleZijlstra commented on Aug 1, 2019

   

   JelleZijlstra

   on Aug 1, 2019

   Member

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   #6899 came out of it :) It's still waiting for review
6. Bidek56 commented on Nov 21, 2019

   

   Bidek56

   on Nov 21, 2019

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   PR #6899 was merged but I am not sure if work correctly.

   mypy with Python 3.8 with the example code:

   import re
   
   advertisement = '10% discount'
   discount = 0.0
   if (mo := re.search(r'(\d+)% discount', advertisement)):
       discount = float(mo.group(1)) / 100.0
   
   

   results in: error: Item "None" of "Optional[Match[str]]" has no attribute "group"
   Any ideas would be appreciated. Thanks
7. JelleZijlstra commented on Nov 22, 2019

   

   JelleZijlstra

   on Nov 22, 2019

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   This is already covered in #7316. Closing this issue as there is general support for assignment expressions; I opened a series of more specific issues for smaller remaining problems.
8. JelleZijlstra

   closed this as completedon Nov 22, 2019