Python learning-Exception Handling and python exception handling
1. Exception basics:
In the programming process, in order to increase friendliness, when a program encounters a bug, the error information is generally not displayed to the user, but
Python Pyspider is used as an example to analyze the web crawler implementation method of the search engine.
In this article, we will analyze a web crawler.
Web Crawler is a tool that scans Network Content and records its useful information. It can
AI, artificial intelligence, Python, man-machine interaction, aipython
Today, with the development of artificial intelligence, if we don't try to get in touch with new things, we will soon be eliminated by the world ~
This article is intended to use
The Python script obtains the operating system version information and the python script version information.
Viewing System Version Information is a common practice. Sometimes you need to enter version information into the asset management system,
The impact of Python exceptions on code running performance.Preface
The exception handling capability of Python is very powerful, but poor use may also bring negative effects. I usually like to use exceptions when writing programs. Although it is
Python Socket programming details, pythonsocket
When using Python for socket programming, you need to use the blocking (default) method to read data streams. At this time, you need to process the data at the end of each time, which is too
Python (BOA) is a dynamically interpreted type of programming language. Python can be used on a variety of operating systems, such as Windows, UNIX, and Mac, or in Java,. NET development platform.AD:"51CTO Technology salon" mobile era data mining
Every three minutes to climb once, try for half a month, an email is not, Baidu products, you know. Code testing is not a problemImport requestsImport JSONImport loggingImport reImport datetimeImport timeImport SmtplibFrom Email.mime.text import
Twisted (1) -- What is asynchronous, twisted -- What is asynchronous
I have long wanted to write an article about python's two asynchronous libraries, twisted and tornado. When developing python tcpserver, we usually only use three libraries,
Summary of some traps and tips in Python, and summary of python traps
Python is a widely used and powerful language that allows us to go deep into this language and learn some control statement skills, standard library tips, and some common
Implement a simple bank transfer operation based on Python, and implement bank transfer through python
Preface
During the development of an application system, four components are required from top to bottom: client-business logic layer-data access
Merge offline data of Baidu audio and video (with python 2.3), python2.3
Parsing in four formats:
Filelist
Slicelist
Download. cfg
Third_party_download.cfg
Or two files. Replace the previous version.
The preliminary test is normal, but the timeline
Merge offline data of Baidu audio and video with python 2.3 format update, python2.3
It has not been updated for a long time.
The resolution in four formats is supported.
Filelist
Slicelist
Download. cfg
Third_party_download.cfg
Or two files.
exception throwing mechanism :When an exception is run, The interpreter first finds the corresponding processing statement (called handle);is not found in the current function, the exception is passed to the upper calling function;If the outermost
First, exception handlingErrors and Exceptions:1, the wrong kind:1) Syntax error: This error, the syntax of the Python interpreter cannot be detected, must be corrected before the program executes2) Logic error:Example: res1=1/0, es2=1+ ' str '2,
In doing based on B/s application. There is often a need to perform tasks in the background, with the simplest example of sending mail. In some projects, such as firewalls, WAF, the foreground is only for displaying content and various parameter
Compared to People's article today the installation method tested a viable copy of the record1 backgroundThese two days is more busy, all kinds of pot to connect, sneak in the end of this article. In our previous "python3.x crawler combat (first
In general, we use Python's third-party library requests and framework scrapy to crawl resources on the web, but the pages that are designed to render JavaScript cannot be crawled, and we use Web Automation testing tools selenium+ No interface
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