from six import iteritems

class Bucket(object):
    """
    The purpose of this class is to be a named bucket for holding attributes.
    This attributes will be concatenated into a string and passed into argv during initialization.
    """
    def __init__(self, instancename, **defaults):
        self._localsetattr('instancename', instancename)
        self._localsetattr('argvattrs', {})
        self.argvattrs.update(defaults)

    def _localsetattr(self, name, value):
        object.__setattr__(self, name, value)

    def __setattr__(self, name, value):
        self.argvattrs[name] = value

    def __getattr__(self, name):
        try:
            return self.argvattrs[name]
        except KeyError:
            return object.__getattr__(self, name)

    def attrlist(self):
        "Concatenate the attributes into a string"
        result = []
        for attr, value in iteritems(self.argvattrs):
            # --- repr is applied to value so that for floats, all of the digits are included.
            # --- The strip is then needed when value is a string.
            attrstring = '{0}.{1}={2} '.format(self.instancename, attr, repr(value).strip("'\""))
            result += [attrstring]
        return result