save project

my_tree.py

+import turtle
+import random
+
+def tree(n):
+    if n < 0:
+        return
+    if n<12:
+        pen.pencolor(random.choice(["snow","lightcoral"]))
+        pen.pensize(n/3)
+    else:
+        pen.pencolor('sienna')
+        pen.pensize(n/10)
+    j = random.randint(0,30)
+    c = random.randint(1,15)
+    pen.forward(n)
+    pen.right(j)
+    tree(n-c)
+    pen.left(j*2)
+    tree(n-c)
+    pen.right(j)
+    pen.penup()
+    pen.forward(-n)
+    pen.pendown()
+
+
+pen = turtle.Turtle()
+pen.color('sienna')
+# 画布大小
+turtle.bgcolor("wheat")      # wheat小麦
+
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+tree(60)
+turtle.done()