How to prevent python requests from percent encoding my URLs?

It is not good solution but you can use directly string:

r = requests.get(url, params='format=json&key=site:dummy+type:example+group:wheel')

---

BTW:

Code which convert payload to this string

payload = {
    'format': 'json', 
    'key': 'site:dummy+type:example+group:wheel'
}

payload_str = "&".join("%s=%s" % (k,v) for k,v in payload.items())
# 'format=json&key=site:dummy+type:example+group:wheel'

r = requests.get(url, params=payload_str)

---

EDIT (2020):

You can also use urllib.parse.urlencode(...) with parameter safe=':+' to create string without converting chars :+ .

As I know requests also use urllib.parse.urlencode(...) for this but without safe=.

import requests
import urllib.parse

payload = {
    'format': 'json', 
    'key': 'site:dummy+type:example+group:wheel'
}

payload_str = urllib.parse.urlencode(payload, safe=':+')
# 'format=json&key=site:dummy+type:example+group:wheel'

url = 'https://httpbin.org/get'

r = requests.get(url, params=payload_str)

print(r.text)

I used page https://httpbin.org/get to test it.

In case someone else comes across this in the future, you can subclass requests.Session, override the send method, and alter the raw url, to fix percent encodings and the like. Corrections to the below are welcome.

import requests, urllib

class NoQuotedCommasSession(requests.Session):
    def send(self, *a, **kw):
        # a[0] is prepared request
        a[0].url = a[0].url.replace(urllib.parse.quote(","), ",")
        return requests.Session.send(self, *a, **kw)

s = NoQuotedCommasSession()
s.get("http://somesite.com/an,url,with,commas,that,won't,be,encoded.")

The solution, as designed, is to pass the URL directly.