Pandas: How do I split text in a column into multiple lines?| Python

Pandas: How do I split text in a column into multiple lines? In data processing, the following types of data are frequently encountered: In the same column, data that should have been filled in multiple rows is filled in one row, but needs to be split into multiple rows for analysis. In the figure above, the column is named "Country ...

Posted by clodius on Sat, 08 Jun 2019 23:38:26 +0200

python multi-process learning

When encountering CPU-intensive scenarios, we can consider a multi-process approach to solve the problem. For example, I wrote a txt text file myself. It stores 1-999999 numbers sequentially and writes them in three cycles. So I look for the number of times 999999 appears. This scenario is computationally intensive, that is, it belongs to the ...

Posted by dominicd on Sat, 08 Jun 2019 23:20:03 +0200

Polynomial Regression Learning Notes

Operating system: CentOS 7.3.1611_x64 python version: 2.7.5 sklearn version: 0.18.2 tensorflow version: 1.2.1 Definition and manifestation of polynomials Polynomial is a basic concept in algebra. It is an algebraic expression obtained by finite addition and subtraction, multiplication and power multiplication of natural numbers by vari ...

Posted by davidp on Fri, 07 Jun 2019 22:56:27 +0200

python project to solve sandbox dependence problem in production environment without external network

python project to solve sandbox dependence problem in production environment without external network In our actual production project deployment process, such as banking, government intranet, can not access certain dependency sources. Considering the actual situation, we will see how to solve this problem. development environment Establishin ...

Posted by JeBu on Fri, 07 Jun 2019 20:01:14 +0200

Packet filtering and analysis instance tshark tcpdump

Blog Links: http://codeshold.me/2017/08/tcpdump_tshark_notes.html Usually we need to analyze and count the data packages. Although it is very convenient to use python scapy library to develop, it will be more convenient if we are familiar with tshark (wireshark command line), tcpdump and other tools, including editcap, mergecap and so on, ...

Posted by proctk on Fri, 07 Jun 2019 03:23:45 +0200

String objects and array objects in javascript

1. The concept of JavaScript objects In javascript, except for null and undefined, other data types are defined as objects Variables, string, math, array, and data can also be defined by creating objects, which are important built-in objects in javascript. Most of the functions of javascript programs are object-based var aa=Number.MAX_VALUE; ...

Posted by mariolopes on Fri, 07 Jun 2019 00:20:34 +0200

matplotlib for data visualization

A learning blog post from the matplotlib library.matplotlib is very important for data visualization, it fully encapsulates all the API s of MatLab, and it works best with Python's syntax in a python environment. I. Installation of Library and configuration of environment Under windows: py-3-m PIP install Matplotlib Under linux: python3-m PIP ...

Posted by seaweed on Thu, 06 Jun 2019 18:48:11 +0200

Basic learning and detailed explanation of python Network Framework twisted

Three basic modules of twisted network framework: Protocol, ProtocolFactory, Transport. These three modules are the basic components of twisted server-side and client-side programs.Protocol: Protocol Object Implements Protocol Content, i.e. Communication Content ProtocolProtocolFactory: A representation of the factory pattern, where protocols a ...

Posted by fcaserio on Tue, 04 Jun 2019 20:32:20 +0200

Python: A Brief Analysis of the Pit Excavated by return and finally

Initial knowledge of return _Believe that every child shoe that has used Python function will definitely use return statement. As the name implies, return is used to return value to the caller, for example: def test(): a = 2 return a s = test() print s # Output result 2 For the above results, I believe that everyone will not be surpri ...

Posted by sidhumaharaj on Tue, 04 Jun 2019 04:04:03 +0200

Python3 Intermediate Player: Taobao Tmall Commodity Search Crawler Automation Tool (First)

View. Github 1. Preface Hello, everybody, today I want to talk about a more practical crawling tool to grab the key commodity information of Taobao, that is: Enter keywords, sort by price, grab listed commodity information and download pictures, and support export to Excel. If: After reading the instructions below, the Python language is alm ...

Posted by PJNEW on Mon, 03 Jun 2019 19:52:38 +0200