triqs.gfs.block_gf.BlockGf.__getitem__

BlockGf.__getitem__(key)

Access a block by string name or integer position.

Parameters:

keystr or int

Block name (e.g. 'up') or zero-based block index (negative integers count from the end).

Returns:

Gf

The requested block (a reference, not a copy).

Raises:

IndexError

If key does not name an existing block, or if the integer is out of range.

TypeError

If key is neither a str nor an int.