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
+
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+
+# pen.forward(200)
+# pen.right(30)
+# pen.forward(100)
+# pen.forward(-100)
+# pen.left(60)
+# pen.forward(100)
+def tree(n):
+    if n>0:
+        angle=random.randint(10,30)
+        rnm=random.randint(3,15)
+        if n<=12:
+            a=random.choice(["snow",'pink','lightcoral'])
+            print(a)
+            pen.color(a)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+
+        pen.forward(n)
+        pen.right(angle)
+        tree(n-rnm)
+        pen.left(2*angle)
+        tree(n-rnm)
+        pen.left(-angle)
+        pen.up()
+        pen.forward(-n)
+        pen.down()
+        
+tree(50)
+turtle.done()
\ No newline at end of file