assigned variable fails to show up

[Skaperen]

i have a big script with a line that assigns an IPv6 address string literal to the variable ipv6and the next line tries to print it:

ipv6 = 'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128'
print('ipv6 =',repr(ipv6))

running it in Python 3.5.2 gets:

Output:
Traceback (most recent call last):
  File "get_ipv6.py", line 96, in <module>
    print('ipv6 =',repr(ipv6))
NameError: name 'ipv6' is not defined

then i add print() calls to dump out locals() and globals() and 'ipv6' just was just not in there. how can i go about debugging this?

these lines were not indented at all and not in any if statements or loops. it should have been straight unconditional execution.