認証と試しになにかGETしてみるところまで.py

 import requests

 # func は print とかするラッパーだと思ってもらえれば
 import func

 proxies = {
   "http": "...",
   "https": "...",
 }

 URL = 'https://...'
 token = '...'

 # 認証して bearerToken を得る。
 headers = {
     'Authorization': f'token {token}'
 }
 r = requests.post(f'{URL}/api/tokens/authenticate', proxies=proxies, headers=headers)
 if r.status_code!=200:
     func.print_request(r)
     exit(0)
 d = r.json()
 bearerToken = d['bearerToken']
 expirationMsec = int(d['expiresInMilliseconds'])
 expirationMin = expirationMsec/(1000*60)
 print(f'bearer token expiration: {expirationMin} minutes.')

 # 以下はテストとして、特定の project version の endpoint を得るまで。

 headers = {
     'Authorization': f'bearer {bearerToken}'
 }

 r = requests.get(f'{URL}/api/projects', proxies=proxies, headers=headers)
 d = r.json()
 items = d['items']
 target_projectname = 'project1'
 target_item = None
 for item in items:
     if item['name'] != target_projectname:
         continue
     target_item = item
     break
 if not target_item:
     func.error(f'No project found: {target_projectname}')

 prefix = item['_meta']['href']
 body = '/versions'
 next_endpoint = f'{prefix}{body}'
 r = requests.get(next_endpoint, proxies=proxies, headers=headers)
 d = r.json()
 items = d['items']
 target_projectversionname = 'x.y.z'
 target_item = None
 for item in items:
     if item['versionName'] != target_projectversionname:
         continue
     target_item = item
     break
 if not target_item:
     func.error(f'No project version found: {target_projectversionname}')