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Python中dict遍历,让你的编程更高效

  • 2026-02-06 15:44:57
Python中dict遍历,让你的编程更高效

昨天晚上我在家里蹲着改一个小脚本,哎就是那种“跑一跑就完事”的,结果跑着跑着突然慢得离谱,我还以为又是网卡抽风…后来一看,哦豁,问题就出在我自己写的 dict 遍历上面,写得跟绕口令一样,循环里还各种重复查 key,对吧,这种代码平时不炸,数据一大就开始阴阳怪气。

你们肯定也干过这种事:for k in d: 进去以后又 d[k],再来个 if k in d:,再来个 d.get(k)…反正就是“我明明已经拿到钥匙了,还要回家翻抽屉找钥匙”,离谱。

先把最常见的几种写法摆一下,别整太玄学啊,真的就这几个姿势:

user_score = {"a"10"b"20"c"30}

# 1) 默认遍历 key(最省字,但别在里面乱查)
for uid in user_score:
    score = user_score[uid]
# ... do something

# 2) 同时拿 key + value(我日常最推荐这个,少一次查表)
for uid, score in user_score.items():
# ... do something

# 3) 只要 value
for score in user_score.values():
# ... do something

# 4) 只要 key 的时候还想排序(比如输出报告)
for uid in sorted(user_score):
    print(uid, user_score[uid])

你看第 2 个 items(),就很关键:少一次 user_score[uid] 的哈希查找。别小看这一下,循环 10 万次、100 万次的时候,差距就出来了。群里经常有人问“为啥我遍历 dict 比 list 慢”,你先别怪 Python,先看看自己是不是在循环里重复查了两遍。

然后我那天遇到的坑更土:我一边遍历,一边删 dict 里的东西。嗯…你们懂的,Python 直接给你来一句运行时错误,像在说“哥,别闹”。

正确姿势是:要删就先“拍个快照”,别在迭代的那条河里搬石头。

sessions = {"u1"3"u2"0"u3"1"u4"0}

# 错误示范:遍历时修改大小(别学)
# for k, v in sessions.items():
#     if v == 0:
#         del sessions[k]

# 正确:先拷一份要遍历的 key(或 items)
for k, v in list(sessions.items()):
if v == 0:
del sessions[k]

print(sessions)  # {'u1': 3, 'u3': 1}

我当时还嘴硬说“我就删两个怎么会出事”,结果线上数据一多就崩,尴尬得很…所以这条你们记死:遍历的时候别改 dict 的大小。要改就 list(...) 一下,或者把要删的 key 先收集起来,第二轮再删。

还有一个很生活的场景:你拿到一个 dict,里面 value 是 dict(比如接口返回),你想过滤、改名、挑字段。很多人写三层 for,写到最后自己都不认识自己。

我一般就用 items() + 推导式,简洁还不容易写错,反正“像收拾桌面一样,一次把垃圾捡出来”。

resp = {
"u1": {"name""Tom""age"18"city""BJ"},
"u2": {"name""Ana""age"16"city""CD"},
"u3": {"name""Li",  "age"21"city""SZ"},
}

# 只要 age >= 18 的,顺便把字段扁平化
adult = {
    uid: {"name": info["name"], "age": info["age"]}
for uid, info in resp.items()
if info.get("age"0) >= 18
}

print(adult)  # {'u1': {'name': 'Tom', 'age': 18}, 'u3': {'name': 'Li', 'age': 21}}

你看这里 info.get("age", 0) 也挺实用的,接口偶尔缺字段,你别一上来就 info["age"],缺了直接 KeyError,生产同事大半夜找你喝茶,谁顶得住啊。

再说个我自己特别爱用的小技巧:循环里把 .get 或 .items 先“绑到局部变量”。听起来像玄学对吧,但它真能少一点属性查找开销。别指望这招让你从 10 秒变 0.1 秒哈,但在很热的循环里,能省一点是一点。

defsum_scores(d: dict[str, int]) -> int:
    items = d.items  # 先绑定方法引用
    total = 0
for _, v in items():
        total += v
return total

你要是写那种日志聚合、计数器的脚本,dict 遍历真是家常便饭。比如我那天就是做“按错误码统计次数”,一开始写得很丑:先遍历 list,再 if code in counter,再加一。其实用 get 一行就顺了。

logs = ["200""200""500""404""500""500""200"]

counter: dict[str, int] = {}
get = counter.get  # 绑一下,懒得每次点来点去
for code in logs:
    counter[code] = get(code, 0) + 1

# 遍历输出,按次数从高到低
for code, cnt in sorted(counter.items(), key=lambda x: x[1], reverse=True):
    print(code, cnt)

对了,还有个细节,很多人没意识到:现在的 dict(Python 3.7+)是保持插入顺序的。也就是说你按什么顺序塞进去,大概率就按那个顺序遍历出来。做“配置覆盖”这类事就很舒服,但你别把它当数据库排序哈,想要稳定排序就用 sorted(),别靠“运气”。

最后我再插一句很真实的:写代码别一上来就追求“最优雅”,先保证你遍历 dict 的姿势别把自己绊倒。默认用 .items(),要改大小就 list(...) 快照,value 里拿字段就 get 防缺失,剩下的优化…等你真卡了再说,不然你会跟我一样,半夜对着那几行 for 循环骂骂咧咧。

行了我先不扯了,我这边水烧开了…哦对,谁要是还在循环里 if k in d: d[k] 这种写法,真的,改掉,别等它来教育你。

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  1. CONNECT:[ UseTime:0.001028s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001336s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000719s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000706s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001530s ]
  6. SELECT * FROM `set` [ RunTime:0.001922s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001506s ]
  8. SELECT * FROM `article` WHERE `id` = 473930 LIMIT 1 [ RunTime:0.098116s ]
  9. UPDATE `article` SET `lasttime` = 1770437827 WHERE `id` = 473930 [ RunTime:0.014941s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.002907s ]
  11. SELECT * FROM `article` WHERE `id` < 473930 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005455s ]
  12. SELECT * FROM `article` WHERE `id` > 473930 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006231s ]
  13. SELECT * FROM `article` WHERE `id` < 473930 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010162s ]
  14. SELECT * FROM `article` WHERE `id` < 473930 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.030712s ]
  15. SELECT * FROM `article` WHERE `id` < 473930 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.048838s ]
0.390625s