Placing variable out of list into string (url code)

Question

my list looks like:

lst
['78251'],
 ['18261'],
 ['435921'],
 ['74252'],
 ...]

I want to place that numbers into a url code http://api.brain-map.org/api/v2/data/query.xml?criteria=model::SectionDataSet,rma::criteria,[failed$eq%27false%27],products[abbreviation$eq%27Mouse%27],genes[entrez_id$eq%27inhere%27]'

I tried

for i in lst:
    b = 'http://api.brain-map.org/api/v2/data/query.xml?criteria=model::SectionDataSet,rma::criteria,[failed$eq%27false%27],products[abbreviation$eq%27Mouse%27],genes[entrez_id$eq%27%d%27]' %i

I get no error message but it says


b
Traceback (most recent call last):

  File "<ipython-input-79-89e6c98d9288>", line 1, in <module>
    b

NameError: name 'b' is not defined

So I think the difficult part is that there is no space in between the string... How can I handle this?

The error is caused by a b in your code. There is no b variable in what you've included. It seems you've entered a b and pressed enter from your error message. — MatsLindh
– MatsLindh, Commented May 4, 2020 at 11:17

gtomer · Accepted Answer · 2020-05-04 11:18:39Z

1

The URL is complex, but see example URL:

a= 'http://api.brain-map.org/api/v2/data/query.xml?criteria=' + i + '&gene=model:' + i

answered May 4, 2020 at 11:18

gtomer

6,6041 gold badge14 silver badges29 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Anja Over a year ago

Oh I tried this but I forgot a second +.. thank you!

CallMePerox · Accepted Answer · 2020-05-04 11:21:18Z

1

Try this much more pythonic approach, using .format():

for i in lst:
    b = "http://api.brain-map.org/api/v2/data/query.xml?criteria=model::SectionDataSet,rma::criteria,[failed$eq%27false%27],products[abbreviation$eq%27Mouse%27],genes[entrez_id$eq%27{}%27]".format(i[0])

answered May 4, 2020 at 11:21

CallMePerox

636 bronze badges

Comments

Mustafa Aydın · Accepted Answer · 2020-05-04 11:25:51Z

0

lst = [["78251"], ["18261"], ["435921"], ["74252"]]
for val, in lst:
    b = "http://api.brain-map.org/api/v2/data/query.xml?criteria=model::SectionDataSet," \
        "rma::criteria,[failed$eq%27false%27],products[abbreviation$eq%27Mouse%27]," \
        f"genes[entrez_id$eq%27{val}%27]"

Directly access to values of interest with val, in lst and use implicit string concatenation along with an f-string at the end to substitute the value.

answered May 4, 2020 at 11:25

Mustafa Aydın

18.4k4 gold badges21 silver badges43 bronze badges

Collectives™ on Stack Overflow

Placing variable out of list into string (url code)

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related