CODEWITHSUNDEEP
pythonquery-string
SooIn Nam
SooIn Nam

Reputation: 3171

How to convert a list of strings to a Query String?

I have list of values:

md5 = ['1111', '3333', '44444', '555555', '56632423', '23423514', '2342352323']

I want to concatenate them into a Query String:

'md5=1111&md5=3333&md5=44444&md5=555555&md5=56632423&md5=23423514&md5=2342352323'

What is the best way to do that?

Upvotes: 1

Views: 5827

Answers (3)

schesis
schesis

Reputation: 59148

Since you're building a query string, it's better to use a function from the standard library that's specifically designed to do so:

... than to muck around with str.join(). Here's how you'd use it:

from urllib.parse import urlencode # Python 3
# from urllib import urlencode # Python 2

md5 = ['1111', '3333', '44444', '555555', '56632423', '23423514', '2342352323']
urlencode([("md5", x) for x in md5])

Result:

'md5=1111&md5=3333&md5=44444&md5=555555&md5=56632423&md5=23423514&md5=2342352323'

Alternatively (thanks to Jon Clements in the Python chatroom), you can pass a dictionary to urlencode and the parameter doseq=True:

urlencode({'md5': md5}, doseq=True)

... which produces the same result. This is explained in the documentation linked above:

The value element in itself can be a sequence and in that case, if the optional parameter doseq is evaluates to True, individual key=value pairs separated by '&' are generated for each element of the value sequence for the key. The order of parameters in the encoded string will match the order of parameter tuples in the sequence.

Upvotes: 15

abarnert
abarnert

Reputation: 365777

md5s = '&'.join('md5='+m for m in md5)

The part inside the parentheses is a generator expression, which gives you 'md5='+m for each m in the original list.

The join function takes that expression and links it into one big string, putting an & between each pair.

Upvotes: 5

Simeon Visser
Simeon Visser

Reputation: 122376

You can use join():

md5=['1111','3333','44444','555555','56632423','23423514','2342352323']
print 'md5=' + '&md5='.join(md5)

Upvotes: 0

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