[Vobject] unicode in vcards

[Anil]

I am trying to save a vCard to a file but I am getting UnicodeEncodeError.


serialize = j.serialize()
f.write(serialize)

This last line throws this exception:
<type 'exceptions.UnicodeEncodeError'>: 'ascii' codec can't encode
characters in position 29-31: ordinal not in range(128)

I think j.serialize() returns the data in unicode, but how come this
exception is being thrown when saving to that file?

Thanks,
Anil