def test_zipapply():
funcs = (add_one, add_one, times_two)
values = (1, 2, 3)
result = zipapply(funcs, values)
assert result == [2, 3, 6]
result = zipapply([], [])
assert result == []
def get_dest_columns(self, cursor):
mapping_loaders = map(FunctionMapping.load, self.mapping_signature)
mappings = zipapply(mapping_loaders, repeat(cursor, len(mapping_loaders)))
mapping_columns = [m.dest_column for m in mappings]
return self.transforming_columns() + mapping_columns
def create_copy_from_line(data_types, row):
"""Return line compatible with COPY FROM command."""
entity_id, timestamp, attributes = row
value_mappers = map(value_mapper_by_type.get, data_types)
values = chain(
(str(entity_id), str(timestamp)),
zipapply(value_mappers, attributes)
)
return "\t".join(values) + "\n"