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初识 Python

  • 2026-04-20 07:35:31
初识 Python

windows 环境下安装 python

直接下载 python 安装包，
或者使用下面的命令行安装
npm --add-python-to-path='true' --debug install --global windows-build-tools
安装成功后，找不到 python，可能是环境变量path没设置成功，手动设置就好

print 输出

十六进制数字以 0x 开头可以和数字直接用在运算中
print 0xff + 22
用逗号“,”隔开，就可以连成一串输出
print 'hello', 'python'

注释

Python的注释以 # 开头，后面的文字直到行尾都算注释

解释器提示符

>>>是Python解释器的提示符，不是代码的一部分。

变量

变量名必须是大小写英文、数字和下划线（_）的组合，且不能用数字开头。
等号=是赋值语句，可以把任意数据类型赋值给变量，同一个变量可以反复赋值，而且可以是不同类型的变量，属于动态语言。

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  1. CONNECT:[ UseTime:0.001036s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001669s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.012568s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001306s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001931s ]
  6. SELECT * FROM `set` [ RunTime:0.001716s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001601s ]
  8. SELECT * FROM `article` WHERE `id` = 484762 LIMIT 1 [ RunTime:0.006792s ]
  9. UPDATE `article` SET `lasttime` = 1776669550 WHERE `id` = 484762 [ RunTime:0.003611s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000796s ]
  11. SELECT * FROM `article` WHERE `id` < 484762 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001531s ]
  12. SELECT * FROM `article` WHERE `id` > 484762 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001679s ]
  13. SELECT * FROM `article` WHERE `id` < 484762 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.012407s ]
  14. SELECT * FROM `article` WHERE `id` < 484762 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.010617s ]
  15. SELECT * FROM `article` WHERE `id` < 484762 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010832s ]
0.163997s