Name binding and UnboundLocalError

bogus_scope.py

from application.system import host

class Foo(object):
    def __init__(self, host_ip=None):
        self.host_ip = host_ip or host.default_ip
        for host in range(10):
            print host

f = Foo()
print f.host_ip

# Error given by the above code
#
#Traceback (most recent call last):
#  File "bogus_scope.py", line 11, in <module>
#    f = Foo()
#  File "bogus_scope.py", line 7, in __init__
#    self.host_ip = host_ip or host.default_ip
#UnboundLocalError: local variable 'host' referenced before assignment
#