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Python语言入门5~~认识代码库、dot()命令、forward()命令

  • 2026-02-26 00:53:48
Python语言入门5~~认识代码库、dot()命令、forward()命令

今天看起来任务似乎多一些,不过不要紧,很简单。

首先来认识一下什么叫做代码库:代码库是一套已经写好的代码文件,我们可以直接使用其中编写好的命令。库就像一个工具箱,里面装了很多可以直接使用的工具(命令),当我们想使用工具箱里的某个工具(命令)时,就需要用“import+库名” 这条命令,把对应的库导入到代码文件里。比如我想导入turtle(海龟绘图)代码库,那么程序第一条代码就应该是:import turtle

接下来看一看turtle绘图库里都有什么工具供我们使用:

1、turtle.Pen()是turtle库提供的一个函数,它可以创建并返回一个新的画笔实例。(这里面的P是大写的)

2、pen=turtle.Pen()表示:我们将这个实例赋值给变量pen,之后就可以通过pen这个名字来控制这只画笔,比如画点,画线,移动,改变方向颜色等。

(大家想一想可不可以不定义变量,直接用相对应函数来画呢?答案是可以的,但是会很麻烦,因为函数代码多,容易输入错误,定义一个简单好记的变量很省事,也是常规操作。)

3、pen.dot(20)表示:在画笔当前位置,画一个直径为20像素的实心圆,括号里的参数可更改。

还可以指定颜色如pen.dot(50,'red'):画一个直接为50像素的,红色实心圆。(圆点的中心是画笔的位置)

4、pen.forward(50)表示:让画笔从当前位置,沿着它所朝向的方向(默认是向右),直线移动 50个像素。

实操一下,做一个黑色珍珠项链:


    (下次我们实操画红色珍珠项链,评论区可以留言哦,下篇文章揭晓答案)
    (声明:自学整理,如同行专家发现错误,希望指出,改正。学习平台是点猫平台,封面图片豆包AI生成。)

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  139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
  140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000847s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001344s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003459s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003392s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001372s ]
  6. SELECT * FROM `set` [ RunTime:0.007832s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001454s ]
  8. SELECT * FROM `article` WHERE `id` = 476984 LIMIT 1 [ RunTime:0.001744s ]
  9. UPDATE `article` SET `lasttime` = 1772273106 WHERE `id` = 476984 [ RunTime:0.014222s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.009701s ]
  11. SELECT * FROM `article` WHERE `id` < 476984 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.027959s ]
  12. SELECT * FROM `article` WHERE `id` > 476984 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.014273s ]
  13. SELECT * FROM `article` WHERE `id` < 476984 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.051142s ]
  14. SELECT * FROM `article` WHERE `id` < 476984 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.044389s ]
  15. SELECT * FROM `article` WHERE `id` < 476984 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.035308s ]
0.415786s