CODEWITHSUNDEEP
python
papelr
papelr

Reputation: 438

Combining 4 URL parts using python

I think this has a simple answer, but I haven't been able to crack it. Say you have a URL that needs to be broken down into four parts:

comp1 = 'www.base.com/'
comp2 = list1   # a list of letters, say "AAA", "BBB", "CCC"
comp3 = list2   # another list, but this time dates: '2019/10/21', '2019/10/20', '2019/10/19'
comp4 = "/example.html"

I have tried to combine these in multiple different ways, and I know urllib.parse.urljoin is the best option, but it cannot take more than three arguments:

for i in comp2:
    iter1 = urllib.parse.urljoin(comp1, i)
    print(iter1)  # this pairs the first two components nicely

for j in comp3:
    iter2 = urllib.parse.urljoin(j, comp4)
    print(iter2)  # this just returns '/example.html', and nothing is joined

What's the most pythonic way to join these 4 components? I've tried ''.join(), but that only takes one argument. I'm going to have a lot more than just three iterations. In R, I would just slam my components in a paste0() and call it a night.

Upvotes: 0

Views: 1352

Answers (4)

Shady
Shady

Reputation: 246

My two cents:

def _url(r, *path_components):
    for c in path_components:
        r += "/{}".format(str(c))    
    return r

Upvotes: 0

seawolf
seawolf

Reputation: 2195

You were right to want to use ''.join(), but you are misunderstanding the argument... it should be any iterable (a list, a tuple, or similar). You can create an iterable on the fly by just putting the items in a list or tuple directly:

result = ''.join([comp1, comp2, comp3])

Of course, this assumes that each item in the list is itself a single string element. If comp2 and comp3 are already lists, you may need to also do joins to get them where you want them:

result = ''.join([
    comp1,
    '/'.join(comp2),
    '/'.join(comp3),
    comp4,
])

If you're using modern versions of Python (not Python 2.x) you can also format strings very nicely using f-strings:

result = f'www.base.com/{comp2}/{comp3}/example.html'

Note here, too, that you may need to do additional formatting if comp2 and comp3 are lists:

result = f'www.base.com/{"/".join(comp2)}/{"/".join(comp3)}/example.html'

In that case, make sure the quotes you use on the join strings are different than the quotes on the outer f-string or are properly escaped.

Upvotes: 1

sniperd
sniperd

Reputation: 5274

I suspect this isn't exactly what you want, but if it really is just jamming the string and lists together, this would work:

comp1 = 'www.base.com/'
comp2 = ["AAA", "BBB", "CCC"]
comp3 = ['2019/10/21', '2019/10/20', '2019/10/19']
comp4 = "/example.html"


url = comp1 + "".join(comp2) + "".join(comp3) + comp4

print (url)

results:

www.base.com/AAABBBCCC2019/10/212019/10/202019/10/19/example.html

You can fiddle with the "" in the join to make it toss in / or whatever delimiter you'd want for the items in the list. Perhaps you want AAA/BBB for example. So you would do "/".join([comp2]) instead.

The deal with join only taking 1 argument is it only takes a list, but that list can be made up of a bunch of stuff. Good luck :)

Upvotes: 1

code_boyboy
code_boyboy

Reputation: 43

Going off of your example

you can do something like this:

for x in comp2:
      for y in comp3:
          combine = comp1 + x + y + comp4

Upvotes: 1

Related Questions