save project

my_tree.py

+import turtle
+import random
+
+pen = turtle.Turtle()
+pen.color('sienna')
+# 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)    # 后退
+pen.down()
+pen.speed(10)
+
+def tree(n):
+    if n >= 0:
+        if n < 12:
+            pen.pensize(n/3)
+            colors = ['snow','lightcoral']
+            pen.pencolor(random.choice(colors))
+        else:
+            pen.pensize(n/10)
+            pen.color('sienna')
+
+        length = random.randint(1,15)
+        rangle = random.randint(0,30)
+        pen.forward(n)
+        pen.right(rangle)
+        tree(n-length)
+        pen.left(2*rangle)
+        tree(n-length)
+        pen.right(rangle)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
+
+tree(80)
+
+
+turtle.done()