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.speed(10)
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+def tree(n):
+    a=random.randint(0,23)
+    b=random.randint(1,15)
+    if n>=0:
+        if n<=12:
+            color =random.choice(c)
+            pen.color(color)
+            pen.pensize(b/3)
+        else:
+            pen.color("sienna")
+        pen.pensize(b/10)    
+        pen.pensize(n/10)
+        pen.forward(n)
+        pen.right(a)
+        tree(n-b)
+        pen.left(a*2)
+        tree(n-b)
+        pen.right(a)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+    
+tree(80)
+'''
+pen.forward(100)
+pen.right(30)
+pen.forward(50)
+pen.up()
+pen.backward(50)
+pen.left(60)
+pen.down()
+pen.forward(50)
+pen.up()
+pen.backward(50)
+pen.right(30)
+pen.backward(100)
+'''
+turtle.done()
+