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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def from_dict(cls, cls_dict, fallback_xsi_type=None):
 """Parse the dictionary and return an Entity instance. This will attempt to extract type information from the input dictionary and pass it to entity_class to resolve the correct class for the type. Args: cls_dict: A dictionary representation of an Entity object. fallback_xsi_type: An xsi_type to use for string input, which doesn't have properties Returns: An Entity instance. """

        if not cls_dict:
            return None
        
        if isinstance(cls_dict, six.string_types):
            if not getattr(cls, "_convert_strings", False):
                return cls_dict

        try:
            typekey = cls.dictkey(cls_dict)
        except TypeError:
            typekey = fallback_xsi_type
        klass   = cls.entity_class(typekey)
        return klass.from_dict(cls_dict)