save project

my_tree.py

+import turtle
+import random
+pen = turtle.Turtle()
+pen.color('sienna')
+# 画布大小
+c=["snow","lightcoral"]
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+def tree(n):
+    if n>=0:
+        if n<12:
+            pen.pensize(n/3)
+            pen.pencolor(random.choice(c))
+        else:
+            pen.pencolor("sienna")
+            pen.pensize(n/10)
+        a=random.random()
+        l=1.5*random.random()
+        pen.forward(n)
+        pen.right(30*a)
+        tree(n-10*l)
+        pen.left(60*a)
+        tree(n-10*l)
+        pen.right(30*a)
+        pen.penup()
+        pen.backward(n)
+        pen.pendown()
+tree(60)
+turtle.done()