auto save

.py

+a=[1,2,3,4]
+print(a)
+a.pop(1)
+a.pop(2)
+b=[7,8,9]
+a.extend(b)
+print(a)
\ No newline at end of file

binary_search.py

-# 使用二分查找法，找出9和20在列表里面的索引
-num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
-low=0
-high=9
-guess=0
-num=20
-while low<=high:
-    mid=(low+high)//2
-    guess=num_list[mid]
-    if guess==num:
-        print(mid)
-        break
-    elif guess<num:
-        low=mid+1
-    else:
-        high=mid-1   
+import turtle
+t=turtle.Turtle()
+for i in range(0,100):
+    t.forward(i)
+    t.left(90)
\ No newline at end of file