bidict_bidirectional_map_creation_and_inverse_lookup.py

1from bidict import bidict
2
3# Create a bidict
4element_by_symbol = bidict({'H': 'hydrogen', 'He': 'helium', 'Li': 'lithium'})
5
6# Forward lookup (key to value)
7print(element_by_symbol['H'])
8# Output: 'hydrogen'
9
10# Inverse lookup (value to key) via the .inverse property
11print(element_by_symbol.inverse['helium'])
12# Output: 'He'
13
14# Standard dict-like operations
15element_by_symbol['Be'] = 'beryllium'
16print(len(element_by_symbol))
17# Output: 4