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brief introduction ： Code segmentation is webpack One of the biggest characteristics , Through this feature, you can cut your code into multiple p...
2019-09-22 12:25 views 47

PTA Problem set —— Basics ——6-1 Using function to find the sum of prime numbers (20 branch )

This problem requires the realization of a simple function to determine the prime number , And using this function to calculate the sum of prime n...
2019-09-21 13:08 views 39

Swift closure （block） Detailed explanation

1, closure Swift The closure is simplified ： Inferring parameter and return value types by context Implicitly returns the closure of a single exp...
2019-09-18 11:33 views 29

stata Basic operation of linear regression analysis

One , Basic command of linear regression regress y x1 x2 （ Red means that the command can be abbreviated to red ） with Nerlove For example data ...
2019-09-18 11:21 views 34

Cookie and Session The difference between （ Interview essential ）

one , something in common ：cookie and session Are used to track the browser user identity of the session mode . two , difference ：cookie The data ...
2019-09-17 20:43 views 22

python Foundation 9 —— Files and exceptions

Read entire file with open('pi_digits.txt') as file_object: contents = file_object.read() print(contents.rstrip()) notes ：
2019-09-16 19:55 views 23

PostgreSQL Character cutting ：substring Function introduction

As the most powerful open source database ,Postgresql（ hereinafter referred to as pg） Character processing is also the most powerful , First of al...
2019-09-16 17:11 views 61

vue Element-ui application table Component and use v-for, The result data is not displayed

error vue It's used in the design Element-ui assembly table, At the same time, the v-for="(item,index) in mydata" Cause of error table The loop tr...
2019-09-16 15:30 views 42

Microblog crawler and public opinion analysis -4. Analysis of users' public opinion

import pandas as pdimport numpy as np# Read training data set mblog=pd.read_csv('clean_mblog.csv',encoding='utf_8_sig')mblog.head()import jieba.ana...
2019-09-15 15:01 views 20

c Multiple source files share a structure in language

Introduction in a complex program ,c All the data types of language can not meet our needs , Often need to define their own data structure . There...
2019-09-12 23:40 views 29
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