python —— turtle 绘制正方形
1、导入turtle库。
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2、设置画布,用来显示图。
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3、设置颜色,设置笔宽度,往右移动200单位。
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4、往顺时针旋转90度。再画第二笔。
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5、往顺时针旋转90度,再画第三笔。
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6、顺时针旋转90度,画第四笔,返回开始处。
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