# Wildcard Import
# Detects 'from module import *' which pollutes namespace
id: wildcard-import
name: Wildcard Import
severity: warning
category: readability
defect_class: safety
inline_tier: warning
language: python

message: "Wildcard import — pollutes namespace, hard to track origin"

description: |
  'from module import *' makes it unclear where names come from
  and can cause name collisions. Explicit is better than implicit.
  
  ✅ FIX: Import specific names or use module prefix
  
  ```python
  from os import path, getenv  # GOOD - explicit
  import os  # GOOD - namespace preserved
  os.path.join(...)  # Clear where this comes from
  ```

query: |
  (import_from_statement
    module_name: (dotted_name) @MODULE
    (wildcard_import) @WILDCARD)

metavars:
  - MODULE
  - WILDCARD

tags:
  - readability
  - best-practice
  - imports

examples:
  bad: |
    from os import *  # BAD - where does path come from?
    from numpy import *  # BAD - pollutes namespace
  
  good: |
    from os import path, getenv  # GOOD - explicit
    import numpy as np  # GOOD - namespace preserved

has_fix: false