C:\temp\copy_users.py

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def _objectify( self, maybe_path ):
    if type( maybe_path ) in ( type( '' ), type( () ) ):
        maybe_path = self.restrictedTraverse( maybe_path )
    return maybe_path

def copyUsers( self, source, target ):
    """
        Copy users from source to target, where each is expected to
        implement the UserFolder interface
    """
    source = _objectify( self, source )
    target = _objectify( self, target )
    for user in source.getUsers():
        target._addUser(name=user.name, password=user.__, confirm=user.__,
                        roles=user.roles, domains=user.domains, REQUEST=None)