save project

my_tree.py

+import turtle
+import random
+pen = turtle.Turtle()
+pen.color('sienna')
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+pen.speed(0)
+def tree(l):
+    if l>=0:
+        pen.pensize(l/10)
+        if l<12:
+            color_list=["snow","lightcoral","red"]
+            color=random.choice(color_list)
+            pen.pensize(l/3)
+            pen.color(color)
+        else:
+            pen.pensize(l/10)
+            pen.color("sienna")
+        a=random.randint(5,30)
+        b=random.randint(5,15)
+        pen.forward(l)
+        pen.right(a)
+        tree(l-b)
+        pen.left(a*2)
+        tree(l-b)
+        pen.right(a)
+        pen.color("sienna")
+        pen.backward(l)
+tree(75)
+turtle.done()