Adding label to vertices

Hello, guys

I have been learning graph-tool.. I would like to know if it is possible to
create/load vertices and edges with labels. Im loading a graphml file, and
in this file the node id = A, B ,C etc. However, when the loading is done,
all vertex are transformed into numbers. I would like to know if is it
possible to preservate the vertex name, such as A, B, C, "anyStrings", etc.

Thanks in advance

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