The function of "Counter" make it very convenient to count the number of repeated items in two list. See the following example.
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| >>> from collections import Counter | |
| >>> x = [1, 1, 2, 3, 3, 4, 5, 6, 6] | |
| >>> y = [1, 2, 2, 2, 3, 3, 4, 6, 6, 6] | |
| >>> x_counter = Counter(x) | |
| >>> y_counter = Counter(y) | |
| >>> x_counter | |
| Counter({1: 2, 3: 2, 6: 2, 2: 1, 4: 1, 5: 1}) | |
| >>> y_counter | |
| Counter({2: 3, 6: 3, 3: 2, 1: 1, 4: 1}) | |
| >>> x_counter & y_counter #find the overlapping numbers | |
| Counter({3: 2, 6: 2, 1: 1, 2: 1, 4: 1}) | |
| >>> sum((x_counter & y_counter).values()) #summation of the total number of item overlapped | |
| 7 |
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