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()
+def tree(n):
+    if n>=0:
+        if n<=12:
+            list=['lightcoral','snow']
+            c=random.choice(list)
+            pen.pencolor(c)
+            pen.pensize(n/3)
+        else:
+            pen.pencolor('sienna')
+            pen.pensize(n/10)
+        pen.forward(n)
+        angle=random.randint(10,30)
+        long=random.randint(1,20)
+        pen.right(angle)
+        tree(n-long)
+        pen.left(2*angle)
+        tree(n-long)
+        pen.right(angle)
+        pen.up()
+        pen.backward(n)
+        pen.pendown()
+        pen.speed(0)
+tree(70)
+turtle.done()