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 bnm(n):
+    if n>=0:
+        q=random.randint(15,30)
+        w=random.randint(5,10)
+        e=["snow","lightcoral"]
+        bnm_qwe= n - w
+        if bnm_qwe<5:
+            pen.color(random.choice(e))
+            pen.pensize(5)
+        else:
+            pen.pensize(n/10)
+            pen.color('sienna')
+        pen.forward(n)
+        pen.right(q)
+        bnm(bnm_qwe)
+        pen.left(q*2)
+        bnm(bnm_qwe)
+        pen.right(q)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+
+bnm(60)
+turtle.done()
\ No newline at end of file