A = {"('All', 'Delhi', 'Mumbai')": {}, "('Container', 'Delhi', 'Mumbai')": {},
"('Open', 'Delhi', 'Mumbai')": {12: [12, 22, 25], 7: [9, 5]},
"('Open', 'Doon', 'Gurgaon')": {10: [1, 2, 24], 8: [4], 9: [28, 8], 7:[21]}}
new_dict = {k: v for k, v in A.items() if v}
print(new_dict)
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{"('Open', 'Delhi', 'Mumbai')": {12: [12, 22, 25], 7: [9, 5]}, "('Open', 'Doon', 'Gurgaon')": {8: [4], 9: [28, 8], 10: [1, 2, 24], 7: [21]}}