save project

my_tree.py

+import turtle,random
+
+pen = turtle.Turtle()
+pen.color('sienna')
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+turtle.tracer(False)
+
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+def darw_tree(n):
+  if n>=0:
+    if n<=12:
+      color_list=['white','lightcoral']
+      color=random.choice(color_list)
+      pen.pencolor(color)
+      pen.pensize(n/3)
+    else:
+      pen.pencolor('sienna')
+      pen.pensize(n/10)
+    pen.forward(n)
+    angle=random.randint(0,30)
+    length=random.randint(1,15)
+    pen.right(angle)
+    darw_tree(n-length)
+    length=random.randint(1,15)
+    pen.left(2*angle)
+    darw_tree(n-length)
+    pen.right(angle)
+    pen.penup()
+    pen.backward(n)
+    pen.pendown()
+
+darw_tree(80)
+turtle.done()