save project

my_tree.py

+import turtle
+import random
+def draw(n):
+    if n >= 0:
+        a = random.randint(0,30)
+        b = random.randint(1,15)
+        if (n/10) < 1.2:
+            pen.pensize(n/3)
+            c = random.randint(0,10)
+            if c > 5:
+                pen.color("snow")
+            else:
+                pen.color("lightcoral")
+            pen.fd(n)
+            pen.right(a)
+            draw(n-b)
+            pen.left(a*2)
+            draw(n-b)
+            pen.right(a)
+            pen.up()
+            pen.bk(n)
+            pen.down()
+        else:
+            pen.pensize(n/10)
+            pen.color("sienna")
+            pen.fd(n)
+            pen.right(a)
+            draw(n-b)
+            pen.left(a*2)
+            draw(n-b)
+            pen.right(a)
+            pen.up()
+            pen.bk(n)
+            pen.down()
+pen = turtle.Turtle()
+pen.speed(100)
+pen.color('sienna')
+pen.pensize(2.5)
+# 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()
+draw(60)
+turtle.done()