save project

qwerty.py

+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>=0:
+        angle=random.randint(15,30)
+        lenth=random.randint(1,25)
+        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)   #树干
+        pen.right(angle)   #右边树干
+        tree(tree_lenth)   #右边树枝
+        pen.left(2*angle)   #左边树枝
+        tree(tree_lenth)   #左边树枝
+        pen.right(angle)   #返回起点
+        pen.up()   #退回起点
+        pen.backward(n)   #退回起点
+        pen.down()   #退回起点
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+
+tree(100)
+
+turtle.done()
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