| | 144 | === Similar version with a dict, counts any hashable types === |
| | 145 | |
| | 146 | The previous function can only count occurrences of numbers. |
| | 147 | This counts occurrences of any hashable types and returns a dict instead of a list. |
| | 148 | {{{ |
| | 149 | #!python |
| | 150 | def countitemoccurrences(items, requireditems=[]): |
| | 151 | """Takes a list of hashable items and returns a dict whose keys are those |
| | 152 | items and the values are the counts of how many times each item appers in the list. |
| | 153 | |
| | 154 | If the list requireditems is specified it's values are guaranteed to be keys |
| | 155 | in the resulting dict, even if they don't appear in items in which case the count will be 0 |
| | 156 | |
| | 157 | Examples: |
| | 158 | >>> counttypes('blue green green'.split(), 'blue red green'.split()) |
| | 159 | {'blue': 1, 'green': 2, 'red': 0} |
| | 160 | """ |
| | 161 | counts = dict() |
| | 162 | for i in requireditems: |
| | 163 | counts[i] = 0 |
| | 164 | for i in items: |
| | 165 | counts[i] = counts.get(i, 0) + 1 |
| | 166 | return counts |
| | 167 | }}} |
| | 168 | |
