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Python隐式真值|空列表自动判定为False

  • 2026-08-30 03:51:50
Python隐式真值|空列表自动判定为False
很多教材只讲True和False，但是Python有隐式真假判断，别的数据会自动当成真或者假。

我们直接看这段代码：
 lst = []
if lst:
    print("有数据")
else:
    print("空的") 


运行结果会打印：空的
原因就是空列表[]，会自动被当成False。

给大家整理3种日常最常用写法：
写法1：直接判断变量（推荐，简洁规范）

lst = []
if lst:
    print("有数据")
else:
    print("空的")


写法2：用not判断空（可读性很强）

lst = []
if not lst:
    print("空的")


写法3：新手传统写法（计算长度判断）

lst = []
if len(lst) == 0:
    print("空的")


💡核心知识点
Python里自动视为假的值：0、空字符串""、空列表[]、空字典{}、None
除了上面这些，其余的值都会默认当成True。
以后判断列表、字符串有没有内容，不用写len去计算长度，直接用变量判断就行，是Python实战里很常用的简洁写法。

抖音号：筛过岁月，藏喜入怀
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  1. CONNECT:[ UseTime:0.000948s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001338s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003446s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.013515s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001626s ]
  6. SELECT * FROM `set` [ RunTime:0.001611s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001709s ]
  8. SELECT * FROM `article` WHERE `id` = 512343 LIMIT 1 [ RunTime:0.004526s ]
  9. UPDATE `article` SET `lasttime` = 1788058702 WHERE `id` = 512343 [ RunTime:0.026835s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.001780s ]
  11. SELECT * FROM `article` WHERE `id` < 512343 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003166s ]
  12. SELECT * FROM `article` WHERE `id` > 512343 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006032s ]
  13. SELECT * FROM `article` WHERE `id` < 512343 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.026802s ]
  14. SELECT * FROM `article` WHERE `id` < 512343 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009584s ]
  15. SELECT * FROM `article` WHERE `id` < 512343 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007208s ]
0.297816s