Kuna nini tofauti kati ya lists, tuples na dictionaries?

Question

Accepted Answer

Hizi tatu ni mkusanyiko unaotumiwa zaidi wa Python, kila moja inafaa kwa mahitaji tofauti. Tofauti kuu ni **kubadilika**, **mpangilio**, na **jinsi unavyofikia vipengele**.

## List — mlolongo ulioamriwa, unabadilika

```python
fruits = ["apple", "banana", "cherry"]
fruits[0]            # "apple" — index access
fruits.append("date") # ✅ mutable — can add/remove/change
fruits[1] = "berry"   # change in place
len(fruits)          # 4
```

Tumia **list** kwa mkusanyiko ulioamriwa unaobadilika — ongeza, ondoa, panga upya vitu.

## Tuple — mlolongo ulioamriwa, usiobadilika

```python
point = (3, 4)
point[0]             # 3 — index access (like a list)
point[0] = 5         # ❌ TypeError — tuples are IMMUTABLE
x, y = point         # unpacking — common use
```

Tumia **tuple** kwa kundi la thamani iliyowekwa isiyobadilika — kuratibu, rekodi, kurudi kwa kazi kwa thamani nyingi. Kwa kuwa tuples haibadiliwi, zinaweza pia kuwa **dict keys** na ni kidogo zaidi ya kulingana na kumbukumbu.

## Dict — ramani ya funguo-thamani

```python
user = {"name": "Ann", "age": 30}
user["name"]              # "Ann" — access by KEY, not index
user["email"] = "a@x.com" # mutable — add/update
user.get("phone", "N/A")  # safe access with a default
for k, v in user.items(): ...  # iterate key-value pairs
```

Tumia **dict** kuorodhesha funguo kwa thamani kwa utafutaji wa haraka kwa jina (O(1)). Tangu Python 3.7, dicts huhifadhi mpangilio wa kuingiza.

## Kulinganisha

```text
              List          Tuple         Dict
Mutable?      yes           no            yes
Ordered?      yes           yes           yes (insertion, 3.7+)
Access by     index         index         key
Syntax        [1, 2]        (1, 2)        {"k": v}
Use for       changing seq  fixed record  key→value lookup
Dict key?     no            yes           no
```

## Kwa nini ina maana

Kuchagua mkusanyiko sahihi ni uamuzi wa msingi, wa kila siku wa Python unaosababisha usahihi, utendaji, na maksudi.

Lists kwa data ya mlolongo inabadilika, tuples kwa rekodi isiyobadilika/iliyowekwa (na dict keys), dicts kwa utafutaji wa haraka utofautishwa na funguo — kutumia moja inayofaa husambaza maksudi (tuple inasambaza "hii haitabadilika") na inatoa sifa za utendaji sahihi (utafutaji wa dict O(1) dhidi ya utafutaji wa list O(n)).

Kuzitumia vibaya (kwa mfano, kutafuta ndani ya list wakati utafutaji wa dict unafaa) ni chanzo cha kawaida cha code ya polepole au isiyoeleweka.