save project

my_tree.py

+import turtle
+import random
+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()
+pen.speed(0)
+def tree(n):
+    if n>=0:
+        if n <=12:
+            list=["snow","lightcoral"]
+            c=random.choice(list)
+            pen.pencolor(c)
+            pen.pensize(n/3)
+        else:
+            pen.color("sienna")
+            pen.pensize(n/10)
+        pen.forward(n)
+        a=random.randint(30,40)
+        b=random.randint(0,10)
+        pen.right(a)
+        tree(n-b)
+        pen.left(a*2)
+        tree(n-b)
+        pen.right(a)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(60)
+turtle.done()
+'''
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+pen.forward(150)
+pen.right(30)
+pen.forward(80)
+pen.up()
+pen.backward(80)
+pen.down()
+pen.left(60)
+pen.forward(80)
+pen.backward(80)
+pen.right(30)
+pen.backward(150)
+turtle.done()
+'''