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9 Commits

Author SHA1 Message Date
Dennis Sweeney 80a2a4ed7d
bpo-38530: Refactor and improve AttributeError suggestions (GH-25776) 
- Make case-swaps half the cost of any other edit
- Refactor Levenshtein code to not use memory allocator, and to bail early on no match.
- Add comments to Levenshtein distance code
- Add test cases for Levenshtein distance behind a debug macro
- Set threshold to `(name_size + item_size + 3) * MOVE_COST / 6`.
  - Reasoning: similar to `difflib.SequenceMatcher.ratio()` >= 2/3:
```
"Multiset Jaccard similarity" >= 2/3
matching letters / total letters >= 2/3
(name_size - distance + item_size - distance) / (name_size + item_size) >= 2/3
1 - (2*distance) / (name_size + item_size) >= 2/3
1/3 >= (2*distance) / (name_size + item_size)
(name_size + item_size) / 6 >= distance
With rounding:
(name_size + item_size + 3) // 6 >= distance
```

Co-authored-by: Pablo Galindo <pablogsal@gmail.com>
 2021-05-03 16:47:27 +01:00
Dennis Sweeney 284c52da09
bpo-38530: Require 50% similarity in NameError and AttributeError suggestions (GH-25584) 2021-04-27 01:22:27 +01:00
Pablo Galindo 0b1c169c4a
bpo-38530: Cover more error paths in error suggestion functions (GH-25462) 2021-04-17 23:28:45 +01:00
Pablo Galindo 3ab4bea5a3
bpo-38530: Include builtins in NameError suggestions (GH-25460) 2021-04-17 22:26:54 +01:00
Pablo Galindo 0ad81d4db2
bpo-38530: Match exactly AttributeError and NameError when offering suggestions (GH-25443) 2021-04-16 17:12:03 +01:00
Pablo Galindo 3fc65b97d0
bpo-38530: Optimize the calculation of string sizes when offering suggestions (GH-25412) 2021-04-15 00:03:43 +01:00
Pablo Galindo e07f4ab26a
bpo-38530: Make sure that failing to generate suggestions on failure will not propagate exceptions (GH-25408) 2021-04-14 18:58:28 +01:00
Pablo Galindo 5bf8bf2267
bpo-38530: Offer suggestions on NameError (GH-25397) 
When printing NameError raised by the interpreter, PyErr_Display
will offer suggestions of simmilar variable names in the function that the exception
was raised from:

    >>> schwarzschild_black_hole = None
    >>> schwarschild_black_hole
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    NameError: name 'schwarschild_black_hole' is not defined. Did you mean: schwarzschild_black_hole?
 2021-04-14 15:10:33 +01:00
Pablo Galindo 37494b441a
bpo-38530: Offer suggestions on AttributeError (#16856) 
When printing AttributeError, PyErr_Display will offer suggestions of similar 
attribute names in the object that the exception was raised from:

>>> collections.namedtoplo
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'collections' has no attribute 'namedtoplo'. Did you mean: namedtuple?
 2021-04-14 02:36:07 +01:00