python - 从字符串中解析值

Question

我有:

url = 'http://example.com/json?key=12345&lat=52.370216&lon=4.895168&status=upcoming&radius=20&offset=0'

如何解析参数radius的值20？

我认为urlparse.parse_qs()不可能，不是吗？还有比使用正则表达式更好的方法吗？

Answer 1

是的，使用parse_qs() :

Parse a query string given as a string argument (data of type application/x-www-form-urlencoded). Data are returned as a dictionary. The dictionary keys are the unique query variable names and the values are lists of values for each name.

>>> from urlparse import parse_qs
>>> url = 'http://example.com/json?key=12345&lat=52.370216&lon=4.895168&status=upcoming&radius=20&offset=0'
>>> parse_qs(url)['radius'][0]
'20'

UPD:正如 @DanielRoseman 指出的(参见评论)，您应该首先通过 urlparse 传递 url:

>>> from urlparse import parse_qs, urlparse
>>> parse_qs(urlparse(url).query)['radius'][0]
'20'