save project

my_tree.py

+import turtle
+import random
+
+pen = turtle.Turtle()
+pen.color('sienna')
+pen.speed(100)
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)
+pen.down()
+
+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.up()
+        pen.backward(n)
+        pen.down()
+tree(60)
+turtle.done()