python list to format and replace data

Question

Requesting data from a website returns a list which looks like this.

[
     "https://site1.com/:hash",
     "https://site2.com/:hash",
     "https://site3.com/:hash",
     "https://site4.com/:hash",
     "https://site5.com/:hash"
]

I'm trying to loop over the list and replace the :hash with my a variable that equals cats . The extra formatting from the list along with the extra punctuation and the search/replace has me stumped. Any additional help would be greatly appreciated.

Final Result Requested

https://site1.com/cats
https://site2.com/cats
https://site3.com/cats
https://site4.com/cats
https://site5.com/cats

So far I have the following

#!/usr/bin/env python3
import os
import requests
gw_path = 'https://raw.githubusercontent.com/ipfs/public-gateway-checker/master/gateways.json'

r = requests.get(gw_path)
text = r.text
for item in text:
   mod = item.replace(':hash', 'cats')
   print(mod)

.

Answer 1

If a is the initial list, use list comprehension :

a = ["https://site1.com/:hash",
      "https://site2.com/:hash",
      "https://site3.com/:hash",
      "https://site4.com/:hash",
      "https://site5.com/:hash"]

modified_a = [i.replace(':hash', 'cats') for i in a]

modified_a
['https://site1.com/cats',
 'https://site2.com/cats',
 'https://site3.com/cats',
 'https://site4.com/cats',
 'https://site5.com/cats']

And:

print "[%s]" % (','.join(modified_a)

[https://site1.com/cats,https://site2.com/cats,https://site3.com/cats,https://site4.com/cats,https://site5.com/cats]