save project

my_tree.py

+import turtle
+import random
+color=["lightcoral","white"]
+def tree(n):
+    if n>=0:
+        a=15
+        l=random.randint(1,15)
+        c=random.choice(color)
+        pen.pensize(n/10)
+        pen.forward(n)
+        pen.left(a)
+        tree(n-l)
+        pen.right(2*a)
+        tree(n-l)
+        pen.left(a)
+        pen.up()
+        pen.backward(n)    # 后退
+        pen.down()
+        if l<=6:
+            pen.color(c)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+
+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()
+tree(60)
+
+turtle.done()
+