欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

Python爬虫——实战三:爬取苏宁易购的商品价格

程序员文章站 2024-01-30 18:09:16
苏宁易购的商品价格请求URL为 https://pas.suning.com/nspcsale_0_000000000152709847_000000000152709847...

苏宁易购的商品价格请求URL为

https://pas.suning.com/nspcsale_0_000000000152709847_000000000152709847_0000000000_10_010_0100101_20268_1000000_9017_10106_Z001___R0104002_46.5_0_.html?callback=pcData&_=1503023077300

价格在返回的数据中结构为:pcData[0]–>data–>price–>saleInfo–>0–>promotionPrice。

但是上面的URL很难看出是什么结构,并且也不知道需要的信息应该从哪里获得。所以直接访问URL这种方法不具备通用性。

"""
from PySide.QtGui import *
from PySide.QtWebKit import *
from PySide.QtCore import *
"""
from PySide import *
import time

class BrowserRender(QWebView):
    def __init__(self, show=True):
        self.app = QApplication(sys.argv)
        QWebView.__init__(self)
        if show:
            self.show()

    def download(self, url, timeout=60):
        loop = QEventLoop()
        timer = QTimer()
        timer.setSingleShot(True)
        timer.timeout.connect(loop.quit)
        self.loadFinished.connect(loop.quit)
        self.load(QUrl(url))
        timer.start(timeout * 1000)
        loop.exec_()
        if timer.isActive():
            timer.stop()
            return self.html()
        else:
            print "Request time out: " + url

    def html(self):
        return self.page().mainFrame().toHtml()

    def find(self, pattern):
        return self.page().mainFrame().findAllElements(pattern)

    def attr(self, pattern, name, value):
        for e in self.find(pattern):
            e.setAttribute(name, value)

    def text(self, pattern, value):
        for e in self.find(pattern):
            e.setPlainText(value)

    def click(self, pattern):
        for e in self.find(patter):
            e.evaluateJavaScript("this.click()")

    """
    def wait_load(self, pattern, timeout=60):
        deadline = time.time() + timeout
        while time.time() < deadline:
            self.app.processEvents()
            matches = self.find(pattern)
            if matches:
                return matches
        print "wait load time out"
    """
    9
if __name__=="__main__":
    br = BrowserRender()
    br.download("https://product.suning.com/0000000000/152709847.html?srcpoint=index3_homepage1_32618213038_prod02")
    price = br.find("span.mainprice" )  
    print price[0].toPlainText().strip()