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Python crawler method to obtain data
Python crawlers can send HTTP requests through the request library, parse HTML with the parsing library, extract data with regular expressions, or use a data scraping framework to obtain data. More knowledge about Python crawlers. Read the article below this topic for details. PHP Chinese website welcomes everyone to come and learn.
Python crawler method to obtain dataPython crawlers can send HTTP requests through the request library, parse HTML with the parsing library, extract data with regular expressions, or use a data scraping framework to obtain data. Detailed introduction: 1. The request library sends HTTP requests, such as Requests, urllib, etc.; 2. The parsing library parses HTML, such as BeautifulSoup, lxml, etc.; 3. Regular expressions extract data. Regular expressions are used to describe string patterns. Tools can extract data that meets requirements by matching patterns, etc.
Basic use of requests library1. The difference between response.content and response.text: response.content is an encoded byte type ("str" data type), and response.text is a unicode type. The use of these two methods depends on the situation. Note: unicode -> str is the encoding process (encode()); str -> unicode is the decoding process (decode()). An example is as follows: # --codin...
How to use the Python web crawler requests library1. What is a web crawler? Simply put, it is to build a program to download, parse and organize data from the Internet in an automated way. Just like when we browse the web, we will copy and paste the content we are interested in into our notebooks for easy reading and browsing next time - the web crawler helps us automatically complete these content. Of course, if we encounter some websites that cannot be copied and pasted - —Web crawlers can show their power even more. Why do we need web crawlers? When we need to do some data analysis-and many times this data is stored in web pages, and it takes time to download it manually.
An article will guide you through the urllib library in Python (operating URLs)Using Python language can help everyone learn Python better. The function provided by urllib is to use programs to perform various HTTP requests. If you want to simulate a browser to complete a specific function, you need to disguise the request as a browser. The method of camouflage is to first monitor the requests sent by the browser, and then camouflage them based on the browser's request header. The User-Agent header is used to identify the browser.
What should I do if I want to use the urllib2 package in python3.6?The urllib2 toolkit in Pyhton2 was split into two packages: urllib.request and urllib.error in Python3. As a result, the package cannot be found and there is no way to install it. So install these two packages and use the method when importing.
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