单线程爬虫：

import re

import requests

import time

url_EB = 'http://www.amazon.com/gp/search/other/ref=sr_sa_p_4?me=A22XNR713HGDVG&rh=n%3A9063592011%2Ck%3Aprojector&bbn=9063592011&keywords=projector&pickerToList=brandtextbin&ie=UTF8&qid=1461902521'

headers_EB = {'User-Agent':'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.86 Safari/537.36'}

url_AML = '''https://www.amazon.com/gp/search/other/ref=sr_sa_p_4?me=A3UJI9WWE6PRP5&rh=i%3Amerchant-items

&pickerToList=brandtextbin&ie=UTF8&qid=1461899728'''

headers_AML ={'User-Agent':'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.86 Safari/537.36'}

url_DL= 'https://www.amazon.com/gp/search/other/ref=sr_sa_p_4?me=AS7ZU4MN0FPOY&rh=i%3Amerchant-items&pickerToList=brandtextbin&ie=UTF8&qid=1461901862'

headers_DL = {'User-Agent':'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.86 Safari/537.36'}

name = {'a':'ExclusiveBulbs',

        'b':'Amazing Lamps',

        'c':'Dynamic Lamps'}

# listing_count = re.findall('<span class="narrowValue">(.*?)</span',data.text)

# f = dict(map(lambda x,y:[x,y],store_name,listing_count))

#

# for k,v in f.items():

#     print(k,v)

def foo_one(url,headers,name):

    print('--------------------------开始爬去{0}at{1}---------------------------'.format(name,time.ctime()))

    response = requests.get(url,headers=headers)

    store_name = re.findall('<span class="refinementLink">(.*?)</span><span class="narrowValue">(.*?)</span',response.text)

    for i in store_name:

        print(i)

    print('--------------------------爬去完毕at{}----------------------------'.format(time.ctime()))

    time.sleep(1)

if __name__ == '__main__':

    foo_one(url_EB,headers_EB,name['a'])

    foo_one(url_AML,headers_AML,name['b'])

    foo_one(url_DL,headers_DL,name['c'])

输出：00:25:33开始，00:26:02结束 耗时29秒

--------------------------开始爬去ExclusiveBulbsatSat Apr 30 00:25:33 2016---------------------------

('A.Shine', ' (97)')

('AmpacElectronics', ' (1,644)')

('AuraBeam', ' (33,084)')

('AWO', ' (1,206)')

('Battery1inc', ' (694)')

('Comoze Lamps', ' (6,172)')

('Compatible Lamp', ' (317)')

('Corgi Lamps', ' (2,124)')

('CTLAMP', ' (3,499)')

('Dell', ' (191)')

('Diamond Lamps', ' (966)')

('Dynamic', ' (4)')

('Eiki', ' (460)')

('ePharos', ' (2,592)')

('Epson', ' (1,456)')

('EREPLACEMENT', ' (115)')

('eReplacements', ' (814)')

('eWo's', ' (120)')

('eWorldlamp', ' (354)')

('FI Lamps', ' (5,707)')

('FL Projector Lamp For Mitsubishi', ' (1)')

('For Epson', ' (3)')

('Generic', ' (9,769)')

('Good Lamp', ' (819)')

('HCDZ', ' (2,746)')

('Hitachi', ' (935)')

('IET Lamps', ' (2,144)')

('InFocus', ' (44)')

('JVC', ' (326)')

('KCL', ' (3,781)')

('Lampedia', ' (618)')

('Lutema', ' (1,956)')

('Mitsubishi', ' (1,006)')

('Mogobe', ' (1,335)')

('MyProjectorLamps', ' (473)')

('NEC', ' (446)')

('Nec Computers', ' (13)')

('Optoma', ' (956)')

('Osram Sylvania', ' (78)')

('Panasonic', ' (820)')

('Philips', ' (7,502)')

('Powerwarehouse', ' (9,971)')

('Projector Lamps World', ' (112)')

('Pureglare', ' (369)')

('Samsung', ' (1,078)')

('Sharp', ' (426)')

('Shopforbattery', ' (2,510)')

('SMART BOARD', ' (66)')

('Sony', ' (990)')

('TVLampsforless', ' (14)')

('Unknown', ' (722)')

--------------------------爬去完毕atSat Apr 30 00:25:57 2016----------------------------

--------------------------开始爬去Amazing LampsatSat Apr 30 00:25:58 2016---------------------------

('AWO', ' (1)')

('Comoze Lamps', ' (2)')

('DNGO', ' (8)')

('Electrified', ' (9)')

('ELECTRIFIED', ' (10)')

('Electrified Discounters', ' (5)')

('ELECTRIFIED LAMPS', ' (1,177)')

('ELECTRIFIED PRINTHEAD', ' (24)')

('ELECTRIFIED PRINTHEADS', ' (2)')

('FI Lamps', ' (2)')

('Generic', ' (34)')

('GloWatt', ' (1)')

('KCL', ' (1)')

('OEM', ' (1)')

('Powerwarehouse', ' (7)')

('SKU', ' (5)')

('Top Lamp', ' (1)')

('Unknown', ' (1)')

('USOM', ' (3)')

--------------------------爬去完毕atSat Apr 30 00:26:00 2016----------------------------

--------------------------开始爬去Dynamic LampsatSat Apr 30 00:26:01 2016---------------------------

('Battery1inc', ' (85)')

('BenQ', ' (237)')

('Buslink', ' (31)')

('Calumet', ' (2)')

('Comoze Lamps', ' (405)')

('CTLAMP', ' (615)')

('Dell', ' (82)')

('Divine Lighting', ' (36)')

('DNGO', ' (63)')

('Dynamic', ' (4)')

('Eiko', ' (140)')

('Electrified', ' (2)')

('ELECTRIFIED LAMPS', ' (24)')

('Electronix Xpress', ' (418)')

('ePharos', ' (502)')

('Epson', ' (631)')

('eReplacements', ' (119)')

('FI Lamps', ' (505)')

('FL Projector Lamp For Mitsubishi', ' (1)')

('G-lamps', ' (43)')

('GE', ' (248)')

('GE Lighting', ' (152)')

('General Electric', ' (53)')

('Generic', ' (1,671)')

('Genie', ' (101)')

('GLAMPS', ' (2)')

('Impact', ' (7)')

('Industrial Lighting Solutions', ' (9)')

('KCL', ' (280)')

('Kodak', ' (1)')

('Lampedia', ' (63)')

('M-Wave', ' (830)')

('Mitsubishi', ' (406)')

('Mitsubishi DLP TV Bulbs', ' (29)')

('Mocpinc', ' (10)')

('MyProjectorLamps', ' (344)')

('Nec', ' (19)')

('Optoma', ' (161)')

('Osram', ' (1,295)')

('Panasonic', ' (245)')

('Philips', ' (988)')

('Powerwarehouse', ' (239)')

('Projector Lamps World', ' (45)')

('Pureglare', ' (107)')

('Samsung', ' (323)')

('ShopJimmy', ' (3)')

('Sony', ' (141)')

('Sylvania', ' (115)')

('Technical Precision', ' (10)')

('Unknown', ' (167)')

('Welch Allyn Compatible', ' (1)')

--------------------------爬去完毕atSat Apr 30 00:26:02 2016----------------------------

多线程：00：32:37开始00:32:39结束 耗时2秒

import re

import requests

import threading

import time

from time import ctime,sleep

url_EB = 'http://www.amazon.com/gp/search/other/ref=sr_sa_p_4?me=A22XNR713HGDVG&rh=n%3A9063592011%2Ck%3Aprojector&bbn=9063592011&keywords=projector&pickerToList=brandtextbin&ie=UTF8&qid=1461902521'

headers_EB = {'User-Agent':'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.86 Safari/537.36'}

url_AML = '''https://www.amazon.com/gp/search/other/ref=sr_sa_p_4?me=A3UJI9WWE6PRP5&rh=i%3Amerchant-items

&pickerToList=brandtextbin&ie=UTF8&qid=1461899728'''

headers_AML ={'User-Agent':'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.86 Safari/537.36'}

url_DL= 'https://www.amazon.com/gp/search/other/ref=sr_sa_p_4?me=AS7ZU4MN0FPOY&rh=i%3Amerchant-items&pickerToList=brandtextbin&ie=UTF8&qid=1461901862'

headers_DL = {'User-Agent':'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.86 Safari/537.36'}

name = {'a':'ExclusiveBulbs',

        'b':'Amazing Lamps',

        'c':'Dynamic Lamps'}

# listing_count = re.findall('<span class="narrowValue">(.*?)</span',data.text)

# f = dict(map(lambda x,y:[x,y],store_name,listing_count))

#

# for k,v in f.items():

#     print(k,v)

def foo_one(url,headers,name):

    print('--------------------------开始爬去{0}at{1}---------------------------'.format(name,time.ctime()))

    response = requests.get(url,headers=headers)

    store_name = re.findall('<span class="refinementLink">(.*?)</span><span class="narrowValue">(.*?)</span',response.text)

    for i in store_name:

        print(i)

    print('--------------------------爬去完毕{0}at{1}----------------------------'.format(name,time.ctime()))

threads = []

t1 = threading.Thread(target=foo_one,args=(url_EB,headers_EB,name['a']))

threads.append(t1)

t2 = threading.Thread(target=foo_one,args=(url_AML,headers_AML,name['b']))

threads.append(t2)

t3 = threading.Thread(target=foo_one,args=(url_DL,headers_DL,name['c']))

threads.append(t3)

if __name__ == '__main__':

    for t in threads:

        t.setDaemon(True)

        t.start()

    t.join()

    print ("all over %s" %ctime())

输出：

--------------------------开始爬去ExclusiveBulbsatSat Apr 30 00:32:37 2016---------------------------

--------------------------开始爬去Amazing LampsatSat Apr 30 00:32:37 2016---------------------------

--------------------------开始爬去Dynamic LampsatSat Apr 30 00:32:37 2016---------------------------

('A.Shine', ' (97)')

('AmpacElectronics', ' (1,645)')

('AuraBeam', ' (33,088)')

('AWO', ' (1,209)')

('Battery1inc', ' (694)')

('Comoze Lamps', ' (6,172)')

('Compatible Lamp', ' (317)')

('Corgi Lamps', ' (2,123)')

('CTLAMP', ' (3,501)')

('Dell', ' (191)')

('Diamond Lamps', ' (966)')

('Dynamic', ' (4)')

('Eiki', ' (457)')

('ePharos', ' (2,592)')

('Epson', ' (1,456)')

('EREPLACEMENT', ' (115)')

('eReplacements', ' (813)')

('eWo's', ' (120)')

('eWorldlamp', ' (354)')

('FI Lamps', ' (5,710)')

('FL Projector Lamp For Mitsubishi', ' (1)')

('For Epson', ' (3)')

('Generic', ' (9,771)')

('Good Lamp', ' (819)')

('HCDZ', ' (2,748)')

('Hitachi', ' (935)')

('IET Lamps', ' (2,137)')

('InFocus', ' (44)')

('JVC', ' (326)')

('KCL', ' (3,783)')

('Lampedia', ' (618)')

('Lutema', ' (1,955)')

('Mitsubishi', ' (1,006)')

('Mogobe', ' (1,336)')

('MyProjectorLamps', ' (473)')

('NEC', ' (450)')

('Nec Computers', ' (13)')

('Optoma', ' (956)')

('Osram Sylvania', ' (78)')

('Panasonic', ' (820)')

('Philips', ' (7,502)')

('Powerwarehouse', ' (9,972)')

('Projector Lamps World', ' (112)')

('Pureglare', ' (369)')

('Samsung', ' (1,078)')

('Sharp', ' (426)')

('Shopforbattery', ' (2,511)')

('SMART BOARD', ' (66)')

('Sony', ' (990)')

('TVLampsforless', ' (14)')

('Unknown', ' (722)')

--------------------------爬去完毕ExclusiveBulbsatSat Apr 30 00:32:38 2016----------------------------

('Battery1inc', ' (85)')

('BenQ', ' (237)')

('Buslink', ' (31)')

('Calumet', ' (2)')

('Comoze Lamps', ' (405)')

('CTLAMP', ' (615)')

('Dell', ' (82)')

('Divine Lighting', ' (36)')

('DNGO', ' (63)')

('Dynamic', ' (4)')

('Eiko', ' (140)')

('Electrified', ' (2)')

('ELECTRIFIED LAMPS', ' (24)')

('Electronix Xpress', ' (418)')

('ePharos', ' (502)')

('Epson', ' (631)')

('eReplacements', ' (119)')

('FI Lamps', ' (505)')

('FL Projector Lamp For Mitsubishi', ' (1)')

('G-lamps', ' (43)')

('GE', ' (248)')

('GE Lighting', ' (152)')

('General Electric', ' (53)')

('Generic', ' (1,671)')

('Genie', ' (101)')

('GLAMPS', ' (2)')

('Impact', ' (7)')

('Industrial Lighting Solutions', ' (9)')

('KCL', ' (280)')

('Kodak', ' (1)')

('Lampedia', ' (63)')

('M-Wave', ' (830)')

('Mitsubishi', ' (406)')

('Mitsubishi DLP TV Bulbs', ' (29)')

('Mocpinc', ' (10)')

('MyProjectorLamps', ' (344)')

('Nec', ' (19)')

('Optoma', ' (161)')

('Osram', ' (1,295)')

('Panasonic', ' (245)')

('Philips', ' (988)')

('Powerwarehouse', ' (239)')

('Projector Lamps World', ' (45)')

('Pureglare', ' (107)')

('Samsung', ' (323)')

('ShopJimmy', ' (3)')

('Sony', ' (141)')

('Sylvania', ' (115)')

('Technical Precision', ' (10)')

('Unknown', ' (167)')

('Welch Allyn Compatible', ' (1)')

--------------------------爬去完毕Dynamic LampsatSat Apr 30 00:32:39 2016----------------------------

all over Sat Apr 30 00:32:39 2016

　　

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