save project

my_tree.py

+import turtle as t
+import random
+def tree(n):
+    if n>=0:
+        if n<=12:
+            color_list=["snow","lightcoral"]
+            color=random.choice(color_list)
+            pen.color(color)
+            pen.pensize(n/3)
+
+    else:
+        pen.color("sienna")
+        pen.pensize(n/10)
+
+    pen.forward(n)
+    angle=random.random()
+    pen.right(30*angle)
+    length=1.5*random.random()
+    tree(n-10*length)
+    pen.left(60*angle)
+    tree(n-10*length)
+    pen.right(30*angle)
+    pen.penup()
+    pen.backward(n)
+    pen.pendown()
+# 创建画笔 pen
+pen=t.Pen()
+# 设置画笔颜色为'sienna'
+pen.pencolor('sienna')
+pen.speed(0)
+# 创建画布
+screen=t.Screen()
+# 设置画布颜色为'wheat'
+screen.bgcolor('wheat')
+# 设置起点 先向左旋转90
+pen.left(90)
+# 抬笔
+pen.penup()
+# 向后移动150步
+pen.backward(150)
+# 落笔
+pen.pendown()
+# 调用函数tree
+tree(60)
+# 结束运行
+t.done()
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