save project

my_tree.py

+import turtle
+import random
+def tree(n):
+    if n>=0:
+        if n<=12:
+            c=['snow','lightcoral']
+            co=random.choice(c)
+            pen.color(co)
+            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.left(angle)
+            tree(n-length)
+            pen.right(2*angle)
+            tree(n-length)
+            pen.left(angle)
+            pen.up()
+            pen.backward(n)
+            pen.down()
+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.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+tree(100)
+
+turtle.done()
+
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+