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The ipaddress module accepts IPv6 addresses if the IPv4 address is formatted as an octal number, but http://tools.ietf.org/html/rfc3986#section-3.2.2 doesn't allow leading zeroes in the IPv4 address.
This is the current behaviour (in 3.4.1):
>>> ipaddress.ip_address("::1.0.0.00")
IPv6Address('::100:0')
Expected:
>>> ipaddress.ip_address("::1.0.0.00")
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "3.4.1/lib/python3.4/ipaddress.py", line 54, in ip_address
 address)
ValueError: '::1.0.0.00' does not appear to be an IPv4 or IPv6 address
Because I didn't know it better, I first tried to patch the backport but this might be still applicable the official code: https://github.com/phihag/ipaddress/pull/12 

The patch adds an optional keyword which only accepts decimal numbers.

This is what I get now on 3.11:
>>> ipaddress.ip_address("::1.0.0.00")
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "C:\Users\User\src\cpython\Lib\ipaddress.py", line 54, in ip_address
 raise ValueError('%r does not appear to be an IPv4 or IPv6 address' %
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: '::1.0.0.00' does not appear to be an IPv4 or IPv6 address