23, lambda functions implemented by multiplying the two numbers?
lambda [arg1 [,arg2,.....argn]]:expression
24, according to the dictionary from small to large bond
25, the number of library collections using the statistical method of Counter string for each word appears "kjalfj; ldsjafl; hdsllfdhg; lahfbl; hl; ahlf; h"
26, the string a = "not 404 found Zhang Shenzhen 99", each word is a space intermediate, with a regular alphanumeric filtered off, the final output "San Shenzhen"
Incidentally paste matching decimal code:
\d+\.\d+
27, filter () function to obtain a list of all of the odd and the new list structure, a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
filter () function is used to filter sequences, filtered ineligible element returns a list of qualified new elements. This function receives two parameters, as a function of a first, a second sequence, each element of the sequence as an argument to a function arbitrates, then return True or False, and finally returns True elements into a new list
28, a list of all the odd list of requirements to derive the formula and a new list structure, a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
29, regular re.complie role
compile a regular expression compiler generates a regular expression (the Pattern) object with a match () and search () these two methods. Speed, and reuse
30, a = (1,) b = (1), c = ( "1") are what type of data?
31, two lists [1,5,7,9] and [2,2,6,8] merger [1,2,2,3,6,7,8,9]?
may be added individually extend another set to the list of elements, different from the added whole append
32, delete files, and delete files in python linux command method
python: os.remove (filename)
linux: rm filename
33、log日志中，我们需要用时间戳记录error,warning等的发生时间，请用datetime模块打印当前时间戳 “2018-04-01 11:38:54”
顺便把星期的代码也贴上了
34、数据库优化查询的方法
外键、索引、联合查询、选择特定字段等等
35、请列出你会的任意一种统计图（条形图、折线图等）绘制的开源库，第三方也行
matplotlib
36、写一段自定义异常代码
自定义异常用raise抛出异常
37、正则表达式匹配中，（.*）和（.*?）匹配区别？
（.*）是贪婪匹配，会把满足正则的尽可能多的往后匹配
（.*?）是非贪婪匹配，会把满足正则的尽可能少匹配
38、简述Django的orm
ORM，全拼Object-Relation Mapping，意为对象-关系映射
实现了数据模型与数据库的解耦，通过简单的配置就可以轻松更换数据库，而不需要修改代码只需要面向对象编程,orm操作本质上会根据对接的数据库引擎，翻译成对应的sql语句,所有使用Django开发的项目无需关心程序底层使用的是MySQL、Oracle、sqlite....，如果数据库迁移，只需要更换Django的数据库引擎即可。
39、[[1,2],[3,4],[5,6]]一行代码展开该列表，得出[1,2,3,4,5,6]
列表推导式：
x = [[1,2],[3,4],[5,6]]
a = [j for i in a for j in i]
print(a)或者将列表转成numpy矩阵，通过numpy的flatten（）方法：
40、x="abc",y="def",z=["d","e","f"],分别求出x.join(y)和x.join(z)返回的结果
join()括号里面的是可迭代对象，x插入可迭代对象中间，形成字符串，结果一致
41、举例说明异常模块中try except else finally的相关意义
try..except..else没有捕获到异常，执行else语句
try..except..finally不管是否捕获到异常，都执行finally语句
42、python中交换两个数值
43、举例说明zip（）函数用法
zip()函数在运算时，会以一个或多个序列（可迭代对象）做为参数，返回一个由这些序列中并排的元素配对的元组组成的列表。
zip()参数可以接受任何类型的序列，同时也可以有两个以上的参数;当传入参数的长度不同时，zip能自动以最短序列长度为准进行截取，获得元组。
44、a="张明 98分"，用re.sub，将98替换为100
