save project

my_tree.py

+import turtle
+from random import randint,choice
+colors=['red','sienna','white']
+def tree(n,l=50):
+    pen.pensize(randint(3,5))
+    pen.pencolor(choice(colors))
+    if n>1:
+        pen.down()
+        a=randint(5,50)
+        pen.right(a)
+        pen.forward(l)
+        pen.up()
+        tree(n-1,l*(randint(50,100)/100))
+        pen.forward(-l)
+        b=randint(35,60)
+        pen.left(b)
+        pen.down()
+        pen.forward(l)
+        pen.up()
+        tree(n-1,l*(randint(50,100)/100))
+        pen.forward(-l)
+        pen.right(b-a)
+        
+    
+pen = turtle.Turtle()
+pen.color('sienna')
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+pen.pensize(10)
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+pen.forward(100)
+tree(7)
+pen.forward(-100)
+turtle.done()
\ No newline at end of file