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
+pen.speed(0)
+ 
+def tree(n):
+    if n>=0:
+        angle = random.randint(15,30)
+        lenth = random.randint(5,10)
+        pencolor = ['snow','lightcoral']
+        tree_lenth = n - lenth
+        if tree_lenth <5:
+            pen.color(random.choice(pencolor))
+            pen.pensize(5)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+        pen.fd(n)
+        pen.right(angle)
+        tree(tree_lenth)
+        pen.left(2*angle)
+        tree(tree_lenth)
+        pen.right(angle)
+        
+        pen.up()
+        pen.bk(n)
+        pen.down()
+
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+
+# pen.fd(100)
+
+# pen.right(30)
+# pen.fd(50)
+# pen.up()
+# pen.bk(50)
+# pen.down()
+
+# pen.left(60)
+
+
+# pen.right(30)
+# pen.up()
+# pen.bk(100)
+# pen.down()
+
+
+tree(60)
+
+turtle.done()