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.speed(0)
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+
+def tree(n):
+    if n >= 10:
+        angle = random.randint(15,30)
+        length = random.randint(1,15)
+        if n >= 12:
+            pen.pensize(n/10)
+            pen.color('sienna')
+            
+        else:
+            pen.pensize(n/3)
+            color = ['snow','lightcoral']
+            new_color = random.choice(color)
+            pen.color(new_color)
+        pen.forward(n)
+        pen.right(angle)
+        tree(n-length)
+        pen.left(angle * 2)
+        tree(n-length)
+        pen.right(angle)
+        pen.penup()
+        pen.backward(n)
+        pen.pendown()
+tree(60)
+pen.hideturtle()
+
+turtle.done()