save project

my_search.py

+import turtle
 import random
 import random
 
 
-alist = []
-for i in range(1, 101):
-    alist.append(i)
-num = random.choice(alist)
-# 请完善二分查找函数binary_search(),查找出num在列表alist里面的索引位置
+pen = turtle.Turtle()
+pen.color('sienna')
+pen.speed(0)
 
 
-def binary_search(alist,num):
-    less_num = num
-    high = len(alist)-1
-    low = alist[0]
-    while low <= high:
-        mid = (low+high) // 2
-        guess = alist[mid]
-        if guess == less_num:
-            return mid
-        elif guess < less_num:
-            low = mid+1
+w = turtle.Screen()
+w.bgcolor('wheat')
+
+pen.left(90)
+pen.up()
+pen.backward(100)
+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:
         else:
-            high = mid-1
-binary_search(alist,num)
-print('给的数是',num)
+            pen.color('sienna')
+            pen.pensize(n/10)
+        pen.forward(n)
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+        angle = random.random()
+        pen.right(30*angle)
+        length = 1.5*random.random()
+        tree(n-10*length)
+        pen.left(60*angle)
+        tree(n-10*length)
+        pen.right(30*angle)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(60)
+turtle.done()
\ No newline at end of file