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Python 关键字

  • 2026-08-23 22:47:27
Python 关键字

Python 关键字是保留字。Python 解释器使用关键字来理解程序。关键字定义了程序的结构。我们不能使用关键字来命名程序实体,例如变量、类和函数。

Python 中有多少个关键字?

Python 有很多关键字。随着 Python 新功能的不断涌现,关键字的数量还在持续增长。

35

个关键字

3.13

Python 版本

4

个软关键字

截至撰写本教程时,Python 3.13.12 是当前稳定版本,共有 35 个关键字

我们可以使用 Python 解释器的帮助工具获取完整的关键字列表:

Shell

C:\Users\43898> python
Python 3.13.12 (tags/v3.13.12:1cbe481, Feb  3 2026, 18:22:25) [MSC v.1944 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>help()
help> keywords

Here is a list of the Python keywords.  Enter any keyword to get more help.

False               class               from                or
None                continue            global              pass
True                def                 if                  raise
and                 del                 import              return
as                  elif                in                  try
assert              else                is                  while
async               except              lambda              with
await               finally             nonlocal            yield
break               for                 not


help>

📋Python 关键字列表

我们也可以使用 keyword 模块来获取关键字列表:

Python

>>>import keyword
>>> keyword.kwlist
['False''None''True''and''as''assert''async''await''break''class''continue''def''del''elif''else''except''finally''for''from''global''if''import''in''is''lambda''nonlocal''not''or''pass''raise''return''try''while''with''yield']
>>>len(keyword.kwlist)
35
>>>

🔸Python 软关键字

Python 3.9 引入了软关键字的概念。软关键字可以用作变量名,它们仅在特定上下文中才受到特殊处理。目前有 _casematch 和 type 四个软关键字。

Python

>>> keyword.softkwlist
['_''case''match''type']
>>>

💡 为什么需要软关键字?

引入软关键字是为了避免现有代码因变量名冲突而遭到破坏。这给开发人员足够的时间对代码进行相应的修改,实现了向后兼容。

🔍如何检查字符串是否为关键字?

我们可以使用 keyword.iskeyword() 函数来检查一个字符串是否为保留关键字。

例如,print 在 Python 中是关键字吗?

Python

>>> keyword.iskeyword('print')
False
>>>

所以,print不是 Python 中的关键字。

📖Python 关键字速查表(35 个)

下表汇总了 Python 3.13 的全部 35 个关键字,包含用途说明和最小可运行示例:

#
关键词
描述
举例
1
False
布尔假值常量
ok = False
2
None
空值对象,表示"无"
result = None
3
True
布尔真值常量
done = True
4
and
逻辑与
if a > 0 and b > 0:
5
as
起别名或异常绑定变量
import math as m
6
assert
断言条件为真,否则抛错
assert x > 0
7
async
定义异步协程函数
async def fetch():
8
await
等待协程结果
data = await fetch()
9
break
立即跳出当前循环
if x == 3: break
10
class
定义类
class User:
11
continue
跳过本轮循环后续语句
if x % 2 == 0: continue
12
def
定义函数
def add(a, b):
13
del
删除变量名或容器元素
del nums[0]
14
elif
条件分支"否则如果"
elif score >= 60:
15
else
条件或循环中的"否则"
else: print("no")
16
except
捕获异常分支
except ValueError:
17
finally
异常处理中始终执行的块
finally: f.close()
18
for
遍历可迭代对象
for n in nums:
19
from
从模块中导入指定对象
from math import pi
20
global
在函数内声明全局变量
global count
21
if
条件判断起始关键字
if age >= 18:
22
import
导入模块
import os
23
in
成员测试 / for 遍历
if "a" in text:
24
is
身份比较(同一对象)
if x is None:
25
lambda
定义匿名函数
f = lambda x: x * 2
26
nonlocal
绑定外层局部变量
nonlocal total
27
not
逻辑非,取反布尔值
if not items:
28
or
逻辑或
if a == 1 or b == 1:
29
pass
空语句,占位用
def todo(): pass
30
raise
主动抛出异常
raise ValueError("bad")
31
return
从函数返回值并结束
return a + b
32
try
包裹可能抛异常的代码
try: x = int(s)
33
while
条件循环
while n > 0:
34
with
上下文管理,自动清理
with open("a.txt") as f:
35
yield
生成器逐步产出值
yield i

📌总结

✦ 核心要点

Python 关键字具有特定的功能,解释器使用关键字来理解代码并执行它们。Python 目前有 35 个关键字,随着新功能的不断增加,关键字的数量还会继续增长。

🚀下一步学什么

你对 Python 关键字有了初步了解,接下来推荐继续学习以下教程,掌握 Python 编程的基础知识:

📚 推荐阅读

  • Python 标识符
  • Python 变量
  • Python 数据类型
  • Python 语句
  • Python 函数

Python 基础教程系列
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  1. CONNECT:[ UseTime:0.000944s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001381s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.031773s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.017558s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001632s ]
  6. SELECT * FROM `set` [ RunTime:0.003431s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001538s ]
  8. SELECT * FROM `article` WHERE `id` = 512004 LIMIT 1 [ RunTime:0.007939s ]
  9. UPDATE `article` SET `lasttime` = 1787503081 WHERE `id` = 512004 [ RunTime:0.042095s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000808s ]
  11. SELECT * FROM `article` WHERE `id` < 512004 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001279s ]
  12. SELECT * FROM `article` WHERE `id` > 512004 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.011234s ]
  13. SELECT * FROM `article` WHERE `id` < 512004 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002232s ]
  14. SELECT * FROM `article` WHERE `id` < 512004 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002558s ]
  15. SELECT * FROM `article` WHERE `id` < 512004 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.024628s ]
0.327483s