Repository: wemake-services/wemake-python-styleguide

Issue:
WPS434 false positive
# Bug report

## What's wrong

I am unpacking a tuple with, for example, three elements and only need the middle one.

`_, b, _ = result`

Then, I receive a "WPS434 Found reassigning variable to itself".

## How it should be

As this is a false positive, no complaint should be raises

## System information

### flake8 information

Contents of `flake8 --bug-report`:

{
  "dependencies": [],
  "platform": {
    "python_implementation": "CPython",
    "python_version": "3.8.6",
    "system": "Linux"
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      "plugin": "black",
      "version": "0.2.1"
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    {
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      "plugin": "flake8-annotations",
      "version": "2.4.1"
    },
    {
      "is_local": false,
      "plugin": "flake8-bandit",
      "version": "2.1.2"
    },
    {
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      "plugin": "flake8-broken-line",
      "version": "0.2.1"
    },
    {
      "is_local": false,
      "plugin": "flake8-bugbear",
      "version": "19.8.0"
    },
    {
      "is_local": false,
      "plugin": "flake8-comprehensions",
      "version": "3.3.0"
    },
    {
      "is_local": false,
      "plugin": "flake8-darglint",
      "version": "1.5.8"
    },
    {
      "is_local": false,
      "plugin": "flake8-debugger",
      "version": "3.2.1"
    },
    {
      "is_local": false,
      "plugin": "flake8-docstrings",
      "version": "1.5.0, pydocstyle: 5.1.1"
    },
    {
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      "plugin": "flake8-eradicate",
      "version": "0.3.0"
    },
    {
      "is_local": false,
      "plugin": "flake8-expression-complexity",
      "version": "0.0.8"
    },
    {
      "is_local": false,
      "plugin": "flake8-pytest-style",
      "version": "1.3.0"
    },
    {
      "is_local": false,
      "plugin": "flake8-string-format",
      "version": "0.2.3"
    },
    {
      "is_local": false,
      "plugin": "flake8_commas",
      "version": "2.0.0"
    },
    {
      "is_local": false,
      "plugin": "flake8_isort",
      "version": "3.0.1"
    },
    {
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      "plugin": "flake8_quotes",
      "version": "2.1.2"
    },
    {
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      "plugin": "mccabe",
      "version": "0.6.1"
    },
    {
      "is_local": false,
      "plugin": "naming",
      "version": "0.9.1"
    },
    {
      "is_local": false,
      "plugin": "pycodestyle",
      "version": "2.6.0"
    },
    {
      "is_local": false,
      "plugin": "pyflakes",
      "version": "2.2.0"
    },
    {
      "is_local": false,
      "plugin": "rst-docstrings",
      "version": "0.0.12"
    },
    {
      "is_local": false,
      "plugin": "wemake_python_styleguide",
      "version": "0.14.1"
    }
  ],
  "version": "3.8.4"
}

### pip information

Contents of `pip freeze`:
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appdirs @ file:///home/webartifex/.cache/pypoetry/artifacts/68/c7/33/ef0f6af8d1aa906f1a5641762fe5d6f47d565c5a4b3482f1c6fb0f5f20/appdirs-1.4.4-py2.py3-none-any.whl
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Discussion:
codecov[bot]: # [Codecov](https://codecov.io/gh/wemake-services/wemake-python-styleguide/pull/1849?src=pr&el=h1) Report
> Merging [#1849](https://codecov.io/gh/wemake-services/wemake-python-styleguide/pull/1849?src=pr&el=desc) (ccf8ab9) into [master](https://codecov.io/gh/wemake-services/wemake-python-styleguide/commit/272f4d3e9030e4af6584d389fca042d0a06cb6e5?el=desc) (272f4d3) will **not change** coverage.
> The diff coverage is `100.00%`.

[![Impacted file tree graph](https://codecov.io/gh/wemake-services/wemake-python-styleguide/pull/1849/graphs/tree.svg?width=650&height=150&src=pr&token=yMZCKw0D02)](https://codecov.io/gh/wemake-services/wemake-python-styleguide/pull/1849?src=pr&el=tree)

```diff
@@            Coverage Diff            @@
##            master     #1849   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          107       107           
  Lines         5983      5963   -20     
  Branches      1338      1335    -3     
=========================================
- Hits          5983      5963   -20     
```


| [Impacted Files](https://codecov.io/gh/wemake-services/wemake-python-styleguide/pull/1849?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [wemake\_python\_styleguide/visitors/ast/naming.py](https://codecov.io/gh/wemake-services/wemake-python-styleguide/pull/1849/diff?src=pr&el=tree#diff-d2VtYWtlX3B5dGhvbl9zdHlsZWd1aWRlL3Zpc2l0b3JzL2FzdC9uYW1pbmcucHk=) | `100.00% <100.00%> (ø)` | |
| [wemake\_python\_styleguide/compat/nodes.py](https://codecov.io/gh/wemake-services/wemake-python-styleguide/pull/1849/diff?src=pr&el=tree#diff-d2VtYWtlX3B5dGhvbl9zdHlsZWd1aWRlL2NvbXBhdC9ub2Rlcy5weQ==) | `100.00% <0.00%> (ø)` | |
| [wemake\_python\_styleguide/logic/walrus.py](https://codecov.io/gh/wemake-services/wemake-python-styleguide/pull/1849/diff?src=pr&el=tree#diff-d2VtYWtlX3B5dGhvbl9zdHlsZWd1aWRlL2xvZ2ljL3dhbHJ1cy5weQ==) | `100.00% <0.00%> (ø)` | |
| [wemake\_python\_styleguide/compat/routing.py](https://codecov.io/gh/wemake-services/wemake-python-styleguide/pull/1849/diff?src=pr&el=tree#diff-d2VtYWtlX3B5dGhvbl9zdHlsZWd1aWRlL2NvbXBhdC9yb3V0aW5nLnB5) | `100.00% <0.00%> (ø)` | |
| [wemake\_python\_styleguide/logic/safe\_eval.py](https://codecov.io/gh/wemake-services/wemake-python-styleguide/pull/1849/diff?src=pr&el=tree#diff-d2VtYWtlX3B5dGhvbl9zdHlsZWd1aWRlL2xvZ2ljL3NhZmVfZXZhbC5weQ==) | `100.00% <0.00%> (ø)` | |
| [wemake\_python\_styleguide/compat/packaging.py](https://codecov.io/gh/wemake-services/wemake-python-styleguide/pull/1849/diff?src=pr&el=tree#diff-d2VtYWtlX3B5dGhvbl9zdHlsZWd1aWRlL2NvbXBhdC9wYWNrYWdpbmcucHk=) | `100.00% <0.00%> (ø)` | |
| [wemake\_python\_styleguide/visitors/ast/functions.py](https://codecov.io/gh/wemake-services/wemake-python-styleguide/pull/1849/diff?src=pr&el=tree#diff-d2VtYWtlX3B5dGhvbl9zdHlsZWd1aWRlL3Zpc2l0b3JzL2FzdC9mdW5jdGlvbnMucHk=) | `100.00% <0.00%> (ø)` | |
| [wemake\_python\_styleguide/visitors/ast/operators.py](https://codecov.io/gh/wemake-services/wemake-python-styleguide/pull/1849/diff?src=pr&el=tree#diff-d2VtYWtlX3B5dGhvbl9zdHlsZWd1aWRlL3Zpc2l0b3JzL2FzdC9vcGVyYXRvcnMucHk=) | `100.00% <0.00%> (ø)` | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/wemake-services/wemake-python-styleguide/pull/1849?src=pr&el=continue).
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> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/wemake-services/wemake-python-styleguide/pull/1849?src=pr&el=footer). Last update [272f4d3...ccf8ab9](https://codecov.io/gh/wemake-services/wemake-python-styleguide/pull/1849?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).


Patch:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9f124269..97aae535 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -55,6 +55,8 @@ Semantic versioning in our case means:
 - Fixes false negative WPS421 with `pprint.pprint`
 - Fixes WPS441 triggering when reusing variable names in multiple loops
 - Fixes false positive ImplicitEnumerateViolation on range with step #1742
+- Allows to use `_` to declare several unused variables,
+  like: `x, _, _ = coordinates()`
 
 ### Misc
 
diff --git a/wemake_python_styleguide/visitors/ast/naming.py b/wemake_python_styleguide/visitors/ast/naming.py
index 6c372a59..0a9109e9 100644
--- a/wemake_python_styleguide/visitors/ast/naming.py
+++ b/wemake_python_styleguide/visitors/ast/naming.py
@@ -371,7 +371,11 @@ class WrongVariableAssignmentVisitor(BaseNodeVisitor):
         node: AnyAssign,
         names: List[str],
     ) -> None:
-        for used_name, count in Counter(names).items():
+        used_names = filter(
+            lambda assigned_name: not access.is_unused(assigned_name),
+            names,
+        )
+        for used_name, count in Counter(used_names).items():
             if count > 1:
                 self.add_violation(
                     best_practices.ReassigningVariableToItselfViolation(


Test patch:
diff --git a/tests/test_visitors/test_ast/test_naming/test_variable_self_reassignment.py b/tests/test_visitors/test_ast/test_naming/test_variable_self_reassignment.py
index 577cf809..d5c9b0a2 100644
--- a/tests/test_visitors/test_ast/test_naming/test_variable_self_reassignment.py
+++ b/tests/test_visitors/test_ast/test_naming/test_variable_self_reassignment.py
@@ -56,6 +56,13 @@ z = 3
 x, *y = z, x, y
 """
 
+# regression 1812
+# https://github.com/wemake-services/wemake-python-styleguide/issues/1812
+right_parts_unused1 = 'x, _ = some()'
+right_parts_unused2 = 'x, _, _ = some()'
+right_parts_unused3 = '_, x, _ = some()'
+right_parts_unused4 = '_, _, x = some()'
+
 # Wrong:
 
 wrong_fragment = """
@@ -105,6 +112,9 @@ z = 3
 x, y, z = x, z, y
 """
 
+# regression 1812
+wrong_parts_unused1 = 'x, _num, _num = some()'
+
 # Double wrong:
 
 wrong_fragment_tuple_assignment = """
@@ -146,6 +156,7 @@ x, y, z = x, y, z
     wrong_fragment_other_assignment,
     wrong_fragment_typed_other_assignment,
     wrong_fragment_mixed_tuple_assignment,
+    wrong_parts_unused1,
 ])
 def test_self_variable_reassignment(
     assert_errors,
@@ -216,6 +227,10 @@ def test_self_variable_reassignment_triple(
     right_star_assignment1,
     right_star_assignment2,
     right_star_assignment3,
+    right_parts_unused1,
+    right_parts_unused2,
+    right_parts_unused3,
+    right_parts_unused4,
 ])
 def test_correct_variable_reassignment(
     assert_errors,