python获取url中的参数【python3】

引入模块，python3自带，无需安装

from urllib import parse

ps：python2的urlparse包合并到python3的urllib中了

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四个常用方法如下：

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1.url解码

urldata = "https://kns.cnki.net/kcms/detail/detail.aspx?sfield=fn&QueryID=8&CurRec=2&DbCode=%20CJFD&dbname=CJFDAUTO&filename=BYYY202024057&urlid=&yx="

# url解码
urldata = parse.unquote(urldata)
print(urldata)   # https://kns.cnki.net/kcms/detail/detail.aspx?sfield=fn&QueryID=8&CurRec=2&DbCode= CJFD&dbname=CJFDAUTO&filename=BYYY202024057&urlid=&yx=

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2.获取IP/域名

urldata = "https://kns.cnki.net/kcms/detail/detail.aspx?sfield=fn&QueryID=8&CurRec=2&DbCode=%20CJFD&dbname=CJFDAUTO&filename=BYYY202024057&urlid=&yx="

# 获取IP/域名
result =parse.urlparse(urldata)
ip = result.netloc
print(ip)  # kns.cnki.net

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3.获取全部参数的键值组成字典

urldata = "https://kns.cnki.net/kcms/detail/detail.aspx?sfield=fn&QueryID=8&CurRec=2&DbCode=%20CJFD&dbname=CJFDAUTO&filename=BYYY202024057&urlid=&yx="

# 获取全部参数的键值组成字典
result = parse.urlparse(urldata)
query_dict = parse.parse_qs(result.query)
print(query_dict)   # {'sfield': ['fn'], 'QueryID': ['8'], 'CurRec': ['2'], 'DbCode': [' CJFD'], 'dbname': ['CJFDAUTO'], 'filename': ['BYYY202024057']}

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4.根据url中的某个键获取值

urldata = "https://kns.cnki.net/kcms/detail/detail.aspx?sfield=fn&QueryID=8&CurRec=2&DbCode=%20CJFD&dbname=CJFDAUTO&filename=BYYY202024057&urlid=&yx="

# 根据url中的某个键获取值
result = parse.urlparse(urldata)
query_dict = parse.parse_qs(result.query)
dbname = query_dict.get('dbname', [])
abcd = query_dict.get('abcd', [])
print(dbname)  # ['CJFDAUTO']
print(abcd)  # []   有值输出原值，没值输出自定义的值

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