Build URL's by iterating through multiple dictionaries in Python

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I want to build URL's responding to a specific format, the URL's are made of a concatenation of French regions and departments (subdivisions of regions) codes, such as this one : https://www.resultats-elections.interieur.gouv.fr/telechargements/PR2022/resultatsT1/027/021/

I have set two dictionaries, one for the regions and one for the departments codes associated.

regions = {
    'centre_loire': '024',
    'bourgogne': '027',
    'normandie': '028',
    'grand_est': '044',
    'pays_loire': '052',
    'bretagne': '053',
    'aquitaine': '075',
  }

departements = {
    'centre_loire': ['018','028','036','037','041','045'],
    'bourgogne': ['021','025','039','058','070','071','089','090'],
    'normandie': ['014','027','050','061','076'],
    'grand_est': ['008','010','051','052','054','055','057','067','068','088'],
    'pays_loire': ['044','049','053','072','085'],
    'bretagne': ['022','029','035','056'],
    'aquitaine': ['016','017','019','023','024','033','040','047','064','079','086','087'],
  }

The idea is to iterate through those two dictionaries to build URL's but the way I have arranged the for loop associates all the departments with all the regions, even those that have nothing to do together.

regs = []
urls_final = []

for i in regions.values():
  regs = (url_base+tour+'/'+str(i)+'/')
  for key, values in departements.items():
    for value in values:
      deps_result = (regs+str(value)+'/'+str(value)+'/')
      urls_final.append(deps_result)

print(urls_final)

For example, for the "bourgogne" region, the URL's created should contain only the 8 departments codes corresponding to the "bourgogne" region.

list dictionary python loops
2 Answers
base = "www.domain.com/{}/{}"

urls = [base.format(dept, subdept) for region, dept in regions.items() for subdept in departments[region]]
print(urls)

Output:

['www.domain.com/024/018', 'www.domain.com/024/028', 'www.domain.com/024/036', 'www.domain.com/024/037', 'www.domain.com/024/041', 'www.domain.com/024/045', 'www.domain.com/027/021', 'www.domain.com/027/025', 'www.domain.com/027/039', 'www.domain.com/027/058', 'www.domain.com/027/070', 'www.domain.com/027/071', 'www.domain.com/027/089', 'www.domain.com/027/090', 'www.domain.com/028/014', 'www.domain.com/028/027', 'www.domain.com/028/050', 'www.domain.com/028/061', 'www.domain.com/028/076', 'www.domain.com/044/008', 'www.domain.com/044/010', 'www.domain.com/044/051', 'www.domain.com/044/052', 'www.domain.com/044/054', 'www.domain.com/044/055', 'www.domain.com/044/057', 'www.domain.com/044/067', 'www.domain.com/044/068', 'www.domain.com/044/088', 'www.domain.com/052/044', 'www.domain.com/052/049', 'www.domain.com/052/053', 'www.domain.com/052/072', 'www.domain.com/052/085', 'www.domain.com/053/022', 'www.domain.com/053/029', 'www.domain.com/053/035', 'www.domain.com/053/056', 'www.domain.com/075/016', 'www.domain.com/075/017', 'www.domain.com/075/019', 'www.domain.com/075/023', 'www.domain.com/075/024', 'www.domain.com/075/033', 'www.domain.com/075/040', 'www.domain.com/075/047', 'www.domain.com/075/064', 'www.domain.com/075/079', 'www.domain.com/075/086', 'www.domain.com/075/087']
>>>

Note: I've renamed your departements dictionary to departments.

user_109874320

Use the key from the regions dict to get the list values of the departements dict.

regions = {
    'centre_loire': '024',
    'bourgogne': '027',
    'normandie': '028',
    'grand_est': '044',
    'pays_loire': '052',
    'bretagne': '053',
    'aquitaine': '075',
  }

departements = {
    'centre_loire': ['018','028','036','037','041','045'],
    'bourgogne': ['021','025','039','058','070','071','089','090'],
    'normandie': ['014','027','050','061','076'],
    'grand_est': ['008','010','051','052','054','055','057','067','068','088'],
    'pays_loire': ['044','049','053','072','085'],
    'bretagne': ['022','029','035','056'],
    'aquitaine': ['016','017','019','023','024','033','040','047','064','079','086','087'],
  }


url_base = "https://whatever.com"
urls = []
for reg, reg_code in regions.items():
    for dep_code in departements[reg]:
        urls.append(f"{url_base}/{reg_code}/{dep_code}")

from pprint import pprint
pprint(urls)

output

['https://whatever.com/024/018',
 'https://whatever.com/024/028',
 'https://whatever.com/024/036',
 'https://whatever.com/024/037',
 'https://whatever.com/024/041',
 'https://whatever.com/024/045',
 'https://whatever.com/027/021',
 'https://whatever.com/027/025',
 'https://whatever.com/027/039',
 'https://whatever.com/027/058',
 'https://whatever.com/027/070',
 'https://whatever.com/027/071',
 'https://whatever.com/027/089',
 'https://whatever.com/027/090',
 'https://whatever.com/028/014',
 'https://whatever.com/028/027',
 'https://whatever.com/028/050',
 'https://whatever.com/028/061',
 'https://whatever.com/028/076',
 'https://whatever.com/044/008',
 'https://whatever.com/044/010',
 'https://whatever.com/044/051',
 'https://whatever.com/044/052',
 'https://whatever.com/044/054',
 'https://whatever.com/044/055',
 'https://whatever.com/044/057',
 'https://whatever.com/044/067',
 'https://whatever.com/044/068',
 'https://whatever.com/044/088',
 'https://whatever.com/052/044',
 'https://whatever.com/052/049',
 'https://whatever.com/052/053',
 'https://whatever.com/052/072',
 'https://whatever.com/052/085',
 'https://whatever.com/053/022',
 'https://whatever.com/053/029',
 'https://whatever.com/053/035',
 'https://whatever.com/053/056',
 'https://whatever.com/075/016',
 'https://whatever.com/075/017',
 'https://whatever.com/075/019',
 'https://whatever.com/075/023',
 'https://whatever.com/075/024',
 'https://whatever.com/075/033',
 'https://whatever.com/075/040',
 'https://whatever.com/075/047',
 'https://whatever.com/075/064',
 'https://whatever.com/075/079',
 'https://whatever.com/075/086',
 'https://whatever.com/075/087']
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