Label Encoding

Problem

Encode labels as integers 0, 1, 2, ... in order of first appearance.

Return the encoded list; empty input returns [].

Hint

Assign the next integer whenever you see an unseen label.

case 1

in: [["cat","dog","cat","bird"]]

expected: [0,1,0,2]

case 2

in: [[3,1,3,2,1]]

expected: [0,1,0,2,1]

case 3

in: [[5,5,5]]

expected: [0,0,0]

case 4

in: [[]]

expected: []

Starter codePython

def label_encode(labels):
    # Your code here
    pass

4 test cases · run your code against them in the editor