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(200)
+pen.down()
+
+def tree(n):
+  if n >=0:
+    if n<=12:
+        co=['snow','lightcoral']
+        color=random.choice(co)
+        pen.pencolor(color)
+        pen.pensize(n/2)
+    else:
+        pen.pencolor('sienna')
+        pen.pensize(n/10)
+    pen.forward(n)
+    q=random.randint(10,30)
+    a=random.randint(10,15)
+    pen.right(q)
+    tree(n-a)
+    pen.left(2*q)
+    tree(n-a)
+    pen.right(q)
+    pen.up()
+    pen.backward(n)
+    pen.down()
+
+tree(100)
+turtle.done()
+
+