triqs.gfs.block2_gf.Block2Gf.getitem

Block2Gf.__getitem__(key)[source]

Access a single block by name pair.

Parameters:

keytuple of (hashable, hashable): (bn1, bn2) block name pair.

Returns:

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

Raises:

IndexError: If key does not name an existing block.