save project

a.py

+import turtle
+import random
+
+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)
+pen.down()
+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)
+        a=random.randint(1,30)
+        pen.right(a)
+        b=random.randint(1,15)
+        tree(n-b)
+        pen.left(2*a)
+        tree(n-b)
+        pen.right(a)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(60)
+turtle.done()
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my_tree.py

 import turtle
 import turtle
+import random
 
 
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
@@ -9,7 +10,28 @@ w.bgcolor('wheat')      # wheat小麦
 # 移动到起点
 # 移动到起点
 pen.left(90)
 pen.left(90)
 pen.up()
 pen.up()
-pen.backward(150)    # 后退
+pen.backward(150)
 pen.down()
 pen.down()
-
-turtle.done()
+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)
+        a=random.randint(1,30)
+        pen.right(a)
+        b=random.randint(1,15)
+        tree(n-b)
+        pen.left(2*a)
+        tree(n-b)
+        pen.right(b)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(60)
+turtle.done()
\ No newline at end of file