How To Add Custom Parameters To An URL Query String With Python?

I need to add custom parameters to an URL query string using Python Example: This is the URL that the browser is fetching (GET): /scr.cgi?q=1&ln=0 then some python commands ar

Solution 1:

You can use urlsplit() and urlunsplit() to break apart and rebuild a URL, then use urlencode() on the parsed query string:

from urllib import urlencode
from urlparse import parse_qs, urlsplit, urlunsplit

def set_query_parameter(url, param_name, param_value):
    """Given a URL, set or replace a query parameter and return the
    modified URL.

    >>> set_query_parameter('http://example.com?foo=bar&biz=baz', 'foo', 'stuff')
    'http://example.com?foo=stuff&biz=baz'

    """
    scheme, netloc, path, query_string, fragment = urlsplit(url)
    query_params = parse_qs(query_string)

    query_params[param_name] = [param_value]
    new_query_string = urlencode(query_params, doseq=True)

    return urlunsplit((scheme, netloc, path, new_query_string, fragment))

Use it as follows:

>>> set_query_parameter("/scr.cgi?q=1&ln=0", "SOMESTRING", 1)
'/scr.cgi?q=1&ln=0&SOMESTRING=1'

Solution 2:

Use urlsplit() to extract the query string, parse_qsl() to parse it (or parse_qs() if you don't care about argument order), add the new argument, urlencode() to turn it back into a query string, urlunsplit() to fuse it back into a single URL, then redirect the client.

Solution 3:

You can use python's url manipulation library furl.

import furl
f =  furl.furl("/scr.cgi?q=1&ln=0")  
f.args['SOMESTRING'] = 1
print(f.url)

Solution 4:

import urllib
url = "/scr.cgi?q=1&ln=0"
param = urllib.urlencode({'SOME&STRING':1})
url = url.endswith('&') and (url + param) or (url + '&' + param)

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