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没看错吧?5 行代码就能入门爬虫?

为什么当时想起写这个爬虫呢,是因为这是曾经在工作中想要解决的问题,当时不会爬虫,只能用 Excel 花了数个小时才勉强地把数据爬了下来, 所以在接触到爬虫后,第一个想法就是去实现曾未实现的目标。以这样的方式入门爬虫,好处显而易见,就是有了很明确的动力。 很多人学爬虫都是去爬网上教程中的那些网站,网站一样就算了,爬取的方法也一模一样,等于抄一遍,不是说这样无益,但是会容易导致动力不足,因为你没有带着目标去爬,只是为了学爬虫而爬,爬虫虽然是门技术活,但是如果能 建立在兴趣爱好或者工作任务的前提下,学习的动力就会强很多。

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一篇阅读理解的分析Until the twentieth century cigarettes were not an important threat to public health

原文:Until the twentieth century cigarettes were not an important threat to public health. Men used tobacco mainly in the form of cigars. They chewed tobacco, piped tobacco, and snuffed. Most women did not use tobacco at all.The cigarette industry began in 1870s with the development of the cigarette manufacturing machine. This made it possible to produce great numbers of cigarettes very quickly, and it reduced the price.Today cigarette smoking is a widespread habit. About forty-three percent of the adult men and thirty-one percent of the adult women in the United States smoke cigarettes regularly. It is encouraging to note, however, that millions of people have quit smoking. Seventy-five percent of the male population and forty-six percent of the female population have smoked cigarettes for some time during their lives, but twenty-six percent of these men and eleven percent of the women have stopped smoking. The number of persons who have given up smoking is increasing. Men as a group smoke more than women. Among both men and women the age group with the highest proportion of smokers is the age group 24—44.Income, education, and occupation all play a part in determining a person’s smoking habit. City people smoke more than people living on farms. Well-educated men with high incomes are less likely to smoke cigarettes than men with fewer years of schooling and lower incomes. On the other hand, if a well-educated man with a higher income smokes, he’s likely to smoke more packs of cigarettes per day.The situation is somewhat different for women. There are slightly more smokers among women with higher family incomes and higher education than among the lower income and lower educational groups. These more highly educated women tend to smoke more heavily.Among teenagers the picture is similar. There are fewer teenager smokers from upper-income, well-educated families, and also fewer from families living in farm areas. High school students who are preparing for college are less likely to smoke than those who don’t plan to

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