save project

my_tree.py

-import turtle
-
-pen = turtle.Turtle()
+import turtle
+import random
+pen = turtle.Turtle()
 pen.color('sienna')
 pen.speed(0)
-# 画布大小
-w = turtle.Screen()
-w.bgcolor('wheat')      # wheat小麦
-
-def tree(n):
-    if n>=10:
-        pen.forward(n)
-        pen.right(30)
-        tree(n-15)
-
-        pen.left(60)
-        tree(n-15)
-
-        pen.right(30)
-        pen.up()
-        pen.bk(n)
-        pen.down()
-
-
-
-# 移动到起点
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat')      # wheat小麦
+
+def tree(n):
+    if n>=10:
+        angle = random.randint(15,30)
+        lenth = random.randint(1,15)
+        pencolor=["snow","lightcoral"]
+        tree_lenth=n-lenth
+        if tree_lenth <5:
+            pen.color(random.choice(pencolor))
+            pen.pensize(3)
+        else:
+            pen.pensize(n/10)
+            pen.color("sienna")
+
+            
+        pen.forward(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.backward(150)    # 后退
 pen.down()
 
-tree(100)
+tree(60)
 
 turtle.done()