gistfile1.txt

$ cat test.py
#!/usr/bin/env python3

from http import HTTPStatus
from urllib.request import Request, urlopen

BASE = 'https://httpbin.org/status/'

for code in HTTPStatus:
    code = int(code)
    req = Request(BASE + str(code))
    try:
        resp = urlopen(req)
        # print("{} OK: {}".format(code, resp))
    except Exception as ex:
        print("{} exception: {}".format(code, ex))

$ python3 -V
Python 3.6.1
$ python3 test.py
100 exception: HTTP Error 503: Service Unavailable
101 exception: HTTP Error 101: SWITCHING PROTOCOLS
102 exception: HTTP Error 102: PROCESSING
300 exception: HTTP Error 300: MULTIPLE CHOICES
304 exception: HTTP Error 304: NOT MODIFIED
305 exception: HTTP Error 305: USE PROXY
308 exception: HTTP Error 308: UNKNOWN
400 exception: HTTP Error 400: BAD REQUEST
401 exception: HTTP Error 401: UNAUTHORIZED
402 exception: HTTP Error 402: PAYMENT REQUIRED
403 exception: HTTP Error 403: FORBIDDEN
404 exception: HTTP Error 404: NOT FOUND
405 exception: HTTP Error 405: METHOD NOT ALLOWED
406 exception: HTTP Error 406: NOT ACCEPTABLE
407 exception: HTTP Error 407: PROXY AUTHENTICATION REQUIRED
408 exception: HTTP Error 408: REQUEST TIMEOUT
409 exception: HTTP Error 409: CONFLICT
410 exception: HTTP Error 410: GONE
411 exception: HTTP Error 411: LENGTH REQUIRED
412 exception: HTTP Error 412: PRECONDITION FAILED
413 exception: HTTP Error 413: REQUEST ENTITY TOO LARGE
414 exception: HTTP Error 414: REQUEST URI TOO LONG
415 exception: HTTP Error 415: UNSUPPORTED MEDIA TYPE
416 exception: HTTP Error 416: REQUESTED RANGE NOT SATISFIABLE
417 exception: HTTP Error 417: EXPECTATION FAILED
422 exception: HTTP Error 422: UNPROCESSABLE ENTITY
423 exception: HTTP Error 423: LOCKED
424 exception: HTTP Error 424: FAILED DEPENDENCY
426 exception: HTTP Error 426: UPGRADE REQUIRED
428 exception: HTTP Error 428: PRECONDITION REQUIRED
429 exception: HTTP Error 429: TOO MANY REQUESTS
431 exception: HTTP Error 431: REQUEST HEADER FIELDS TOO LARGE
500 exception: HTTP Error 500: INTERNAL SERVER ERROR
501 exception: HTTP Error 501: NOT IMPLEMENTED
502 exception: HTTP Error 502: BAD GATEWAY
503 exception: HTTP Error 503: SERVICE UNAVAILABLE
504 exception: HTTP Error 504: GATEWAY TIMEOUT
505 exception: HTTP Error 505: HTTP VERSION NOT SUPPORTED
506 exception: HTTP Error 506: UNKNOWN
507 exception: HTTP Error 507: INSUFFICIENT STORAGE
508 exception: HTTP Error 508: UNKNOWN
510 exception: HTTP Error 510: NOT EXTENDED
511 exception: HTTP Error 511: UNKNOWN