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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]
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+# 元组，列表，字典，
+#元组
+# a=(1,12,3,4,5,1,2,2,3,1)#有序不可更改
+# b=(12,23,34)
+# print(a[-1::-3])
+# print(len(a))
+# print(a[1])
+# a=(1)
+# b=(2,)
+# print(type(a))
+# print(type(b))
+# a=list(a)
+# a[1]=2
+# a=tuple(a)
+# print(a)
+# c=a*2
+# print(c)
+#count()  index()
+# print(a.count(1))
+# print(a.index(3))
+
+a=['83','ad','b5','c712','6','12','3','554']
+# a.insert(1,90) a.append(1212)
+# a.pop(索引) a.remove(元素) del clear()
+# a.clear()
+# del a 
+# print(a)
+# b=a.copy()
+# c=list(a)
+# d=a
+# print(b,c,d,a)
+
+# b=['1','2']
+# # c=a+b
+# a.extend(b)
+# print(a)
+
+# count() extend() index() reverese() sort()
+# a.sort(reverse=False,key=func())#默认是false,True
+# print(a)
+
+# cars=[
+#     {'car':'bmw','year':1661},
+#     {'car':'benz','year':1990},
+#     {'car':'volvo','year':1668},
+#     {'car':'rr','year':161}
+# ]
+# def func(a):
+#     return a['year']
+
+# cars.sort(reverse=True,key=func)
+# print(cars)
+
+a={'a':1,'b':2}
+b={1,2,4,2,1,2,3,1,1,1,1,1}
+
+# c={2,1,3,4}
+# if b==c:
+#     print(1)
+# for i in b:
+#     print(i)
+# for i in range(len(b)):
+#     print(b[i])
+# c=[1,2,3]
+# d=(1,2,3)
+
+# add() updata() remove() del clear() union() 
+字典，
+ 1key  1value   2  items()
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