(field_specs, exclude_fields)
return sorted(list(combined_field_specs.values()), key=lambda field_spec: field_spec.field)
take a list of FieldSpec objects and return a sorted list where field is unique
    and fields in exclude_fields are removed, and where the first mention of a
    field in field_specs will win out over any repeats.
take a list of FieldSpec objects and return a sorted list where field is unique
    and fields in exclude_fields are removed, and where the first mention of a
    field in field_specs will win out over any repeats.
take a list of FieldSpec objects and return a sorted list where field is unique and fields in exclude_fields are removed and where the first mention of a field in field_specs will win out over any repeats .
def _combine_field_specs(field_specs, exclude_fields):
    """
    take a list of FieldSpec objects and return a sorted list where field is unique
    and fields in exclude_fields are removed, and where the first mention of a
    field in field_specs will win out over any repeats.

    """

    combined_field_specs = {}

    for field_spec in field_specs:
        field = field_spec.field
        if field not in exclude_fields and field not in combined_field_specs:
            combined_field_specs[field] = field_spec

    return sorted(list(combined_field_specs.values()), key=lambda field_spec: field_spec.field)
def _combine_field_specs ( field_specs , exclude_fields ) : combined_field_specs = { } for field_spec in field_specs : field = field_spec . field if field not in exclude_fields and field not in combined_field_specs : combined_field_specs [ field ] = field_spec return sorted ( list ( combined_field_specs . values ( ) ) , key = lambda field_spec : field_spec . field )