save project

my_tree.py

@@ -2,6 +2,7 @@ import turtle
 
 
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
+pen.pensize(10)
 # 画布大小
 # 画布大小
 w = turtle.Screen()
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 w.bgcolor('wheat')      # wheat小麦
@@ -11,5 +12,16 @@ pen.left(90)
 pen.up()
 pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
-
+def tree(a):
+    if a >= 50:
+        pen.forward(a)
+        pen.left(30)
+        pen.forward(a-50)
+        pen.forward(50-a)
+        pen.left(-60)
+        pen.forward(a-50)
+        pen.forward(50-a)
+        pen.left(30)
+        pen.forward(-a)
+tree(100)
 turtle.done()
 turtle.done()