爬蟲筆記：Requests庫詳解
阿新 • • 發佈：2021-01-27
什麼是Requests
之前講解了爬蟲筆記：Urllib庫詳解發現確實有不方便的地方，比如加一個代理，cookie，傳送post請求比較繁瑣。
Request庫能用幾句話實現這些。
Requests 是⽤Python語⾔編寫，基於 urllib，採⽤
Apache2 Licensed 開源協議的 HTTP 庫。
它⽐ urllib 更加⽅便，可以節約我們⼤量的⼯作，完全滿⾜
HTTP 測試需求。
⼀句話——Python實現的簡單易⽤的HTTP庫
安裝
pip3 install requests
或者
pip install requests
用法講解
例項引入
import requests
response = requests.get(r'https://www.2345.com/?38001')
print(type(response))
print(response.status_code)#狀態碼
print(type(response.text))
print(response.text)#文字
print(response.cookies)#cookies
print('結束')
各種請求方式
import requests
requests.post('http://httpbin.org/post')
requests.put( 基本get請求
import requests
response = requests.get('http://httpbin.org/get')
print(response.text)
帶引數的get請求
（在url後拼接，需要用？號分割，用&與號進行連線）
### 帶引數GET請求
import requests
response = 引數在args中
帶引數的get請求（前面用？& 比較複雜，可以用字典形式進行傳值）
import requests
data = {
'name': 'germey',
'age': 22
}
response = requests.get("http://httpbin.org/get", params=data)
print(response.text)
解析json
import requests
import json
response = requests.get("http://httpbin.org/get")
print(type(response.text))
print(response.json())#response直接解析成json
print(json.loads(response.text))#通過json解析庫來解析
print(type(response.json()))
獲取二進位制資料
二進位制資料指圖片或者視訊
import requests
response = requests.get("https://github.com/favicon.ico")
print(type(response.text), type(response.content))
print(response.text)
print(response.content)
圖片下載
import requests
response = requests.get("https://github.com/favicon.ico")
with open('favicon.ico', 'wb') as f:
f.write(response.content)
f.close()
新增headers
在進行爬蟲時新增headers很有必要，如果不新增，很可能把你禁掉
import requests
headers = {'User-Agent':
'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3947.100 Safari/537.36'}
response = requests.get("https://blog.csdn.net/KOBEYU652453/", headers=headers)
print(response.text)
基本POST請求
import requests
data = {'name': 'germey', 'age': '22'}
response = requests.post("http://httpbin.org/post", data=data)
print(response.text)
帶headers
import requests
data = {'name': 'germey', 'age': '22'}
headers = {
'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36'
}
response = requests.post("http://httpbin.org/post", data=data, headers=headers)
print(response.json())
reponse屬性
import requests
response = requests.get('http://www.jianshu.com')
print(type(response.status_code), response.status_code)#狀態碼
print(type(response.headers), response.headers)#請求頭
print(type(response.cookies), response.cookies)#cookies
print(type(response.url), response.url)#網址
print(type(response.history), response.history)#訪問歷史記錄
狀態碼判斷
100: ('continue',),
101: ('switching_protocols',),
102: ('processing',),
103: ('checkpoint',),
122: ('uri_too_long', 'request_uri_too_long'),
200: ('ok', 'okay', 'all_ok', 'all_okay', 'all_good', '\\o/', '✓'),
201: ('created',),
202: ('accepted',),
203: ('non_authoritative_info', 'non_authoritative_information'),
204: ('no_content',),
205: ('reset_content', 'reset'),
206: ('partial_content', 'partial'),
207: ('multi_status', 'multiple_status', 'multi_stati', 'multiple_stati'),
208: ('already_reported',),
226: ('im_used',),
# Redirection.
300: ('multiple_choices',),
301: ('moved_permanently', 'moved', '\\o-'),
302: ('found',),
303: ('see_other', 'other'),
304: ('not_modified',),
305: ('use_proxy',),
306: ('switch_proxy',),
307: ('temporary_redirect', 'temporary_moved', 'temporary'),
308: ('permanent_redirect',
'resume_incomplete', 'resume',), # These 2 to be removed in 3.0
# Client Error.
400: ('bad_request', 'bad'),
401: ('unauthorized',),
402: ('payment_required', 'payment'),
403: ('forbidden',),
404: ('not_found', '-o-'),
405: ('method_not_allowed', 'not_allowed'),
406: ('not_acceptable',),
407: ('proxy_authentication_required', 'proxy_auth', 'proxy_authentication'),
408: ('request_timeout', 'timeout'),
409: ('conflict',),
410: ('gone',),
411: ('length_required',),
412: ('precondition_failed', 'precondition'),
413: ('request_entity_too_large',),
414: ('request_uri_too_large',),
415: ('unsupported_media_type', 'unsupported_media', 'media_type'),
416: ('requested_range_not_satisfiable', 'requested_range', 'range_not_satisfiable'),
417: ('expectation_failed',),
418: ('im_a_teapot', 'teapot', 'i_am_a_teapot'),
421: ('misdirected_request',),
422: ('unprocessable_entity', 'unprocessable'),
423: ('locked',),
424: ('failed_dependency', 'dependency'),
425: ('unordered_collection', 'unordered'),
426: ('upgrade_required', 'upgrade'),
428: ('precondition_required', 'precondition'),
429: ('too_many_requests', 'too_many'),
431: ('header_fields_too_large', 'fields_too_large'),
444: ('no_response', 'none'),
449: ('retry_with', 'retry'),
450: ('blocked_by_windows_parental_controls', 'parental_controls'),
451: ('unavailable_for_legal_reasons', 'legal_reasons'),
499: ('client_closed_request',),
# Server Error.
500: ('internal_server_error', 'server_error', '/o\\', '✗'),
501: ('not_implemented',),
502: ('bad_gateway',),
503: ('service_unavailable', 'unavailable'),
504: ('gateway_timeout',),
505: ('http_version_not_supported', 'http_version'),
506: ('variant_also_negotiates',),
507: ('insufficient_storage',),
509: ('bandwidth_limit_exceeded', 'bandwidth'),
510: ('not_extended',),
511: ('network_authentication_required', 'network_auth', 'network_authentication'),
import requests
response = requests.get('http://www.jianshu.com')
exit() if not response.status_code == 200 else print('Request Successfully')
高階操作
檔案上傳
import requests
files = {'file': open('meinv.jpg', 'rb')}#開啟本地檔案
response = requests.post("http://httpbin.org/post", files=files)
print(response.text)
獲取cookie
import requests
response = requests.get("https://www.baidu.com")
print(response.cookies)
for key, value in response.cookies.items():
print(key + '=' + value)
模擬登入
先設定cookies，再獲取cookies
import requests
requests.get('http://httpbin.org/cookies/set/number/123456789')#先設定cookies ：number/123456789
response = requests.get('http://httpbin.org/cookies')#拿到cookies
print(response.text)
cookie 為空，因為程式碼中的l兩次get為獨立請求。等於說一個瀏覽器裡設定了cookie,再用另一個瀏覽器訪問。
如果要維持，必須先宣告session 物件。
import requests
s = requests.Session()#開啟一個會話
s.get('http://httpbin.org/cookies/set/number/123456789')
response = s.get('http://httpbin.org/cookies')
print(response.text)
代理設定
import requests
proxies = {
"http": "http://127.0.0.1:9743",
"https": "https://127.0.0.1:9743",
}
response = requests.get("https://www.taobao.com", proxies=proxies)
print(response.status_code)
import requests
proxies = {
"http": "http://user:[email protected]:9743/",
}
response = requests.get("https://www.taobao.com", proxies=proxies)
print(response.status_code)
超時設定
import requests
from requests.exceptions import ReadTimeout
try:
response = requests.get("http://httpbin.org/get", timeout = 0.5)
print(response.status_code)
except ReadTimeout:
print('Timeout')
異常處理
import requests
from requests.exceptions import ReadTimeout, ConnectionError, RequestException
try:
response = requests.get("http://httpbin.org/get", timeout = 0.5)
print(response.status_code)
except ReadTimeout:#超時
print('Timeout')
except ConnectionError:#網路問題
print('Connection error')
except RequestException:#其他問題
print('Error')
認證設定
import requests
from requests.auth import HTTPBasicAuth
r = requests.get('http://120.27.34.24:9001', auth=HTTPBasicAuth('user', '123'))
print(r.status_code)
import requests
r = requests.get('http://120.27.34.24:9001', auth=('user', '123'))
print(r.status_code)
作者：電氣-餘登武