Apa iku *args lan **kwargs?

Question

Accepted Answer

`*args` lan `**kwargs` ngidini fungsi nampa **jumlah variabel** saka argumen. `*args` ngumpulaké argumen **positional** ekstra menyang tuple; `**kwargs` ngumpulaké argumen **keyword** ekstra menyang dict. (Jeneng-jenenge minangka konvensi — `*` lan `**` sing penting.)

## *args — argumen positional variabel

```python
def total(*args):           # collects all positional args into a tuple
    print(args)             # e.g. (1, 2, 3)
    return sum(args)

total(1, 2, 3)              # 6
total(1, 2, 3, 4, 5)        # 15 — any number of args
```

## **kwargs — argumen keyword variabel

```python
def configure(**kwargs):    # collects keyword args into a dict
    print(kwargs)           # e.g. {"host": "localhost", "port": 8080}
    for key, value in kwargs.items():
        print(f"{key} = {value}")

configure(host="localhost", port=8080, debug=True)
```

## Nggabung-gabungké (karo parameter biasa)

```python
def func(a, b, *args, **kwargs):
    # a, b → required positional
    # args → extra positional (tuple)
    # kwargs → extra keyword (dict)
    ...

func(1, 2, 3, 4, x=5, y=6)
# a=1, b=2, args=(3, 4), kwargs={"x": 5, "y": 6}
```

Urutan sing dibutuhake yaiku: regular params, banjur `*args`, banjur `**kwargs`.

## Unpacking — arah balik

```python
# `*` and `**` also UNPACK collections INTO arguments at the call site
numbers = [1, 2, 3]
total(*numbers)              # same as total(1, 2, 3)

settings = {"host": "x", "port": 80}
configure(**settings)         # same as configure(host="x", port=80)
```

Sintaks sing padha buka list/dict menyang argumen positional/keyword — gampang kanggo nerusake argumen.

## Panggunaan nyata paling umum: nerusake argumen (decorators, wrappers)

```python
def wrapper(*args, **kwargs):
    # accept ANY arguments and pass them through unchanged
    return original_func(*args, **kwargs)
```

Pola pass-through iki carane decorators lan wrapper functions nangani tuwuh-tuwuhaning signature.

## Apa sing penting

`*args`/`**kwargs` ngidini flexible function signatures sing nampa jumlah argumen apa wae — penting kanggo nulis utilities purpose-umum, wrappers, lan terutama **decorators** (sing kudu mbaleni fungsi saka signatures sing ora dingerteni via `*args, **kwargs`).

Arah unpacking (`*list`, `**dict`) padha gunane kanggo nerusake utawa menyebaraké argumen.

Paham loro-lorone ngumpulaké lan unpacking yaiku kunci nulis Python code reusable, generic lan kanggo maca akeh library APIs lan decorators sing gumantung ing fitur-fitur iki.