<｜begin▁of▁sentence｜>### Instruction:
As an Intensive Care Nurse, imagine you're managing patient data in a specialized healthcare system. You need to handle information about patients' conditions, including labels assigned to various medical procedures and treatments they require. 

How would you set up an AttributeSpecification using the "igraph" API to retrieve these labels, convert them to uppercase for clarity, and ensure there's a default function in place to generate a label if none is specified? This setup is crucial for maintaining accurate records and ensuring seamless communication among healthcare professionals.
### Response:
import igraph as ig

# Create a Graph
edges = [(0, 1), (1, 2), (2, 0)]
g = ig.Graph(edges=edges)

g.vs['label'] = ['A', 'B', 'C']  # Adding attribute 'label' to vertices

# Define an AttributeSpecification for 'label' attribute
attr_spec = ig.AttributeSpecification(name='label',
                                      alt_name='alt_label',
                                      default='Unknown',
                                      transform=str.upper,
                                      func=lambda idx: f'Label_{idx}')

# Use 'func' to generate a value for a vertex
vertex_label = attr_spec.func(1)  # Should return 'Label_1'
print(vertex_label)

# Get the attribute value using the alternative name from a dict
attributes = {'alt_label': 'Custom Label'}
label_value = attributes.get(attr_spec.alt_name, attr_spec.default)
print(label_value)
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