Write a recursive function that calculates the sum of the branch lengths given a tree and node number. The function should return the sum of all branches leading from the node to all descendant leaves. The function should return 0 if leaf is given and return an error message if the node/leaf doesn't exist. Use your function and print the output for nodes: 17, 15, 13, 9, 2 tree3 = { 15: ['N', {'node': 14, 'branch': 0.1}, {'node': 12, 'branch': 0.3}], 14: ['N', {'node': 13, 'branch': 0.2}, {'node': 1, 'branch': 1.5}], 13: ['N', {'node': 11, 'branch': 0.3}, {'node': 9, 'branch': 0.4}], 12: ['N', {'node': 10, 'branch': 0.3}, {'node': 8, 'branch': 0.7}], 11: ['N', {'node': 2, 'branch': 0.25}, {'node': 3, 'branch': 0.35}], 10: ['N', {'node': 6, 'branch': 0.1}, {'node': 7, 'branch': 0.12}], 9: ['N', {'node': 4, 'branch': 0.02}, {'node': 5, 'branch': 0.08}], 8: ['L'], } 7: ['L'], 6: ['L'], 5: ['L'], 4: ['L'], 3: ['L'], 2: ['L'], 1: ['L'] # Answer def sumbranch (tree, node): return "answer" print( sumbranch (tree3, 17) ) print( sumbranch (tree3, 15)) print( sumbranch (tree3, 13)) print( sumbranch (tree3, 9)) print( sumbranch (tree3, 2) ) answer answer answer answer answer

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