It seems that there is no better way to write a crawler than to use Python. The Python community provides many crawler tools that dazzle you. A variety of libraries that can be used directly can be used to write a crawler in minutes. Today I am thinking about writing a crawler, and I will climb down Liao Xuefeng's Python program to make a PDF e-book for offline reading read the whole passage

Those who often write crawlers know that some pages are forbidden to be crawled before logging in. For example, Zhihu's topic page requires users to log in to access it, and "logging in" is inseparable from the cookie technology in HTTP. The principle of login Cookie is very simple, because HTTP is a stateless protocol, so in order to read the whole passage

Crawler Beginner's Series Catalog: Crawler Beginner's Series (I): Quick Understanding of HTTP Protocol Crawler Beginner's Series (II): Elegant HTTP Library Requests Crawler Beginner's Series (III): Building Zhihu API with requests Introduces the use of requests in Crawler's Series Article Elegant HTTP Library Requests read the whole passage

In C/C++, value transfer and reference transfer are two ways of function parameter transfer. How are parameters transferred in Python? Before answering this question, let's look at two pieces of code. Snippet 1: def foo (arg): arg=2 print (arg) a=1 foo (a) # Output: 2 print ( read the whole passage