main.py:

from console import Console
from util import msg

cnsl = Console()
msg("test message")


util.py:

from main import cnsl

def msg(message):
    cnsl.message(3, message)

the error:
~/rts/engine$ python main.py 
Traceback (most recent call last):
  File "__init__.py", line 11, in ?
    from util import msg
  File "/home/steve/rts/engine/util.py", line 8, in ?
    from main import cnsl
  File "/home/steve/rts/engine/main.py", line 11, in ?
    from util import msg
ImportError: cannot import name msg