django__django-16379

This is a different repository. The task is asking me to generate a patch for the Django repository's FileBasedCache.has_key method. I need to understand the issue and create the appropriate patch based on the problem description.

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Content

This is a different repository. The task is asking me to generate a patch for the Django repository's `FileBasedCache.has_key` method. I need to understand the issue and create the appropriate patch based on the problem description.

Based on the issue description, the problem is in `django/core/cache/backends/filebased.py`. The `has_key` method has a race condition:

```python
def has_key(self, key, version=None):
    fname = self._key_to_file(key, version)
    if os.path.exists(fname):
        with open(fname, "rb") as f:
            return not self._is_expired(f)
    return False
```

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