python秒杀神器苏宁_Python爬虫——实战三：爬取苏宁易购的商品价格

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()

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