Question

python运行没报错也没结果

import jsonimport requestsfrom lxml import etreedef page(n): url = f"http://maoyan.com/board/4?off set={n*10}" header = {"User-Agent":"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.26 Safari/537.36 Core/1.63.6756.400 QQBrowser/10.3.2473.400"} r = requests.get(url, headers = header) return r.textdef prase(text): html = etree.HTML(text) names = html.xpath('//div[@class="movie-item-info"]/p[@class="name"]/a/@title') releasetimes = html.xpath('//p[@class="releasetime"]/text()') item = {} for name,releasetime in zip(names,releasetimes): item ['name'] = name item['releasetime'] = releasetime yield item def savefile(data): #保存数据 with open('movie.json','a',encoding='utf-8') as f: data = json.dumps(data,ensure_ascii=False) + '\n' f.write(data)def run(): for n in range(0,10): text = page(n) items = prase(text) for item in items: print(item) savefile(item)if __name__ == "_main_": run()

Answer 1

这个不是程序的问题，只是你还不太熟悉idle的使用而已。问题很简单，但是解释起来确实比较麻烦，建议先放下，继续往后学习一段时间后，你就会发现原来如此了。总之，左边那个shell界面会主动显示变量的值出来，但是右边那个就不会主动显示了，需要你把它放在print函数里，才会显示出来。你可以尝试把 s(1) 这一句改成 print(s(1)) 再运行看看。