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
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+pen.forward(150)
+# 移动到起点
+def tree(a):
+    if a>=0:   
+        pen.pensize(a/10)   
+        long=random.randint(1,30)
+        ss=random.randint(1,15)
+        if a<12:
+           pen.color(snow or lightcoral)         
+        else:
+            pen.color(sienna)           
+        pen.forward(a-ss)
+        pen.right(long)
+        tree(a-10)
+        pen.left(2*long)
+        tree(a-10)
+        pen.right(long)
+        pen.backward(a-ss)
+        return(a)
+tree(60)
\ No newline at end of file