where is FileNotFoundError at?

[Skaperen]

i got a traceback and error in 3.5.2 that said FileNotFoundError was not defined on an except FileNotFoundError: statement.  the documentation appears to say that it is builtin.  but apparently not.

i say "appears" because there are so many exceptions listed and so much upscrolling to do that i could have missed something.

edit: adding traceback

Output:
Traceback (most recent call last):
  File "setup_usr_local_bin.py", line 84, in <module>
    setup('addr')
  File "setup_usr_local_bin.py", line 34, in setup
    if exists(nn):
  File "setup_usr_local_bin.py", line 21, in exists
    except FileNotFoundError:
NameError: global name 'FileNotFoundError' is not defined

i had to scroll way back on my terminal screen to find this.  this was running under user "root" at the time.