dbm.error: db type could not be determined

[ibrahim90000]

Hello Friends, I have this python code i created with python shelve but it keeps giving me errors all of the time.

Here is the code:

import httplib2
import shelve

url = input("Enter the target's Url: ")
url_1 = url.replace("http://", "")
url_2 = url_1.replace("/", "")
s = shelve.open("anon.db", writeback=True)

for u in s["php"]:
a = "/"
url_n = url_2 + a + u
print (url_n)
http_r = httplib2.HTTPConnection(url_2)
u = a + u
http_r.request("GET", u)
reply = http_r.getresponse()

if reply.status == 200:
print ("\n URL found ----- ", url_n)
ch = input("Press c for continue: ")
continue
else:
break
s.close()

And this is the Error it gives:

Enter the target's Url: http://xxx.xxx.xx.xxx/vuln_login/
Traceback (most recent call last):
File "login_page.py", line 7, in <module>
s = shelve.open("anon.db", writeback=True)
File "Z:\Python37\lib\shelve.py", line 243, in open
return DbfilenameShelf(filename, flag, protocol, writeback)
File "Z:\Python37\lib\shelve.py", line 227, in __init__
Shelf.__init__(self, dbm.open(filename, flag), protocol, writeback)
File "C:\Python37\lib\dbm\__init__.py", line 88, in open
raise error[0]("db type could not be determined")
dbm.error: db type could not be determined

Please, if there is a much better solution to this issue, i will gladly appreciate it. Thank you