What is the dataclasses.asdict function?

Question

Accepted Answer

**asdict** recursively converts a **dataclass to dict**.

```python
from dataclasses import dataclass, asdict, field
from typing import List

@dataclass
class Address:
    city: str
    street: str

@dataclass
class User:
    name: str
    age: int
    address: Address
    tags: List[str] = field(default_factory=list)

user = User("Alice", 25, Address("Moscow", "Lenina 1"), ["admin"])

# Convert to dict
dict_data = asdict(user)
print(dict_data)
#{
#    "name": "Alice",
#    "age": 25,
#    "address": {"city": "Moscow", "street": "Lenina 1"},
#    "tags": ["admin"]
#}

# Reverse conversion
user2 = User(**dict_data)

# JSON serialization
import json
json_str = json.dumps(asdict(user), ensure_ascii=False)

# Filtering
slim = {k: v for k, v in asdict(user).items() if k != "address"}

# With exclude
from dataclasses import asdict

compact = asdict(user, dict_factory=lambda x: {k: v for k, v in x if k != "tags"})
```

**Benefits:**
- Recursive conversion.
- Handles nested dataclasses.
- Works with lists and dicts.

Python: What is the dataclasses.asdict function?