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How to get multiple parameters with same name from a URL in Pylons?

So unfortunately I find myself in the situation where I need to modify an existing Pylons application to handle URLs that provide multiple parameters with the same name. Something like the following... domain:port/action?c=1&v=3&c=4

Conventionally the parameters are accessed this way...

from pylons import request
c = request.params.get("c")
#or
c = request.params["c"]

This will return "4" as the value in either case, because ignoring all but the last value seems to be the standard behavior in these situations. What I really need though, is to be able to access both. I tried printing out request.params and get something like this...

NestedMultiDict([(u'c', u'1'),(u'v', u'3'),(u'c', u'4')])

I haven't found a way to index into it, or access that first value for c.

I found a similar question relating to this problem, but solved with PHP:

Something along these lines would work well for me, but maybe some Python code that would fit into Pylons. Has anyone dealt with something like this before?

like image 827
Matthew Pape Avatar asked Feb 06 '13 17:02

Matthew Pape


2 Answers

From the docs - http://docs.pylonsproject.org/projects/pyramid/en/1.3-branch/glossary.html#term-multidict :

multidict An ordered dictionary that can have multiple values for each key. Adds the methods getall, getone, mixed, add and dict_of_lists to the normal dictionary interface. See Multidict and pyramid.interfaces.IMultiDict.

So just call:

request.params.getall('c')
like image 66
Jon Clements Avatar answered Nov 20 '22 18:11

Jon Clements


As an exercise, a rendering in Python of the PHP in the other question (also includes a dummy parameter to illustrate the need for url decoding):

from urlparse import urlparse
from urllib import unquote

url = 'http://www.example.com/action?c=1&v=3&c=4&d=%3A%24%23%40%3D%3F%25%5EQ%5E%24'

url = urlparse(url)

params = url.query.split('&')
params = [ tuple(p.split('=')) for p in params ]
params = [ [unquote(p[0]), unquote(p[1])] for p in params ]

print params

# [['c', '1'], ['v', '3'], ['c', '4'], ['d', ':$#@=?%^Q^$']]
like image 32
daedalus Avatar answered Nov 20 '22 19:11

daedalus