CODEWITHSUNDEEP
pythonstringlisttuplesquery-string
Martin Flucka
Martin Flucka

Reputation: 3285

How to process query parameters in form of a list of tuples?

Given a list of tuples for parameter names and values e.g.:

[("foo", 10), ("bar", None), ("baz", "some_string")]

and some url string e.g.:

"/some/url/string"

my function should be able to create following output string (Note that None value tuples are not included in the query string):

"/some/url/string?foo=10&baz=some_string"

I tried using join but since the values are not all strings, I would have to convert them first. Maybe someone can help me with a short and clean way of doing this.

Upvotes: 2

Views: 2115

Answers (2)

Christian Witts
Christian Witts

Reputation: 11585

Just use the built-in urllib to encode the parameters for you.

>>> import urllib
>>> parameters = [("foo", 10), ("bar", None), ("baz", "some_string")]
>>> clean_parameters = [parameter for parameter in parameters if parameter[1] is not None]
>>> urllib.urlencode(clean_parameters)
'foo=10&baz=some_string'

Upvotes: 2

DrTyrsa
DrTyrsa

Reputation: 31951

>>> from urllib import urlencode
>>> data = [("foo", 10), ("bar", None), ("baz", "some_string")]
>>> urlencode(data)
'foo=10&bar=None&baz=some_string'
>>> urlencode([x for x in data if x[1] is not None]) # no None's
'foo=10&baz=some_string'

Upvotes: 5

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