save project

my_tree.py

+import turtle
+import random
+def tree(n):
+    if n>=0:
+        if n<=12:
+            color_list = ["snow","lightcoral"]
+            color=random.choice(color_list)
+            pen.color(color)
+            pen.pensize(n/3)
+        else:
+            pen.color("sienna")
+            pen.pensize(n/10)
+        pen.forward(n)
+        angle = random.randint(0,30)
+        length = random.randint(1,15)
+
+        pen.right(angle)
+        tree(n-length)
+        pen.left(2*angle)
+        tree(n-length)
+        pen.right(angle)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
+
+pen = turtle.Turtle()
+pen.color('sienna')
+# 画布大小
+w = turtle.Screen()
+w.bgcolor("#00FF00")      # wheat小麦
+
+# 移动到起点
+pen.left(90)
+tree(60)
+# pen.forward(100)
+# pen.right(30)
+# pen.forward(50)
+# pen.up()
+# pen.backward(50)
+# pen.down()
+# pen.left(60)
+# pen.forward(50)
+# pen.up()
+# pen.backward(50)
+# pen.down()
+# pen.right(30)
+# pen.up()
+# pen.backward(100)
+# pen.down()
+
+
+turtle.done()