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AI时代下从掌握Python开始

  • 2026-03-18 04:14:56
AI时代下从掌握Python开始
可变对象和不可变对象
Python中可变对象包括：列表（list）、集合（set）、字典（dict）、自定义对象；
不可变对象包括：数字（（int 整形）、浮点型（float）、布尔型（bool））、字符型（str）。
不可变对象不能原地修改，只能创建新的来替换；可变对象则相当于共享同一内存。
附代码：
"""不可变对象"""a = 10print(id(a))b = aprint(id(b))a = 20print(id(a))'''可变对象'''l1 =[]print(id(l1))l1.append(1)print(id(l1))s1 = set()print(id(s1))s1.add(1)print(id(s1))d1 = dict()print(id(d1))d1['a'] = 1print(id(d1))
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  1. CONNECT:[ UseTime:0.000648s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000823s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000321s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000271s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000471s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000497s ]
  8. SELECT * FROM `article` WHERE `id` = 480499 LIMIT 1 [ RunTime:0.000393s ]
  9. UPDATE `article` SET `lasttime` = 1774587483 WHERE `id` = 480499 [ RunTime:0.001794s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000225s ]
  11. SELECT * FROM `article` WHERE `id` < 480499 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000716s ]
  12. SELECT * FROM `article` WHERE `id` > 480499 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003911s ]
  13. SELECT * FROM `article` WHERE `id` < 480499 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009055s ]
  14. SELECT * FROM `article` WHERE `id` < 480499 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000879s ]
  15. SELECT * FROM `article` WHERE `id` < 480499 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001019s ]
0.089138s