Expand positive integer intervals def expand_intervals(intervals): An interval of consecutive positive integers can be succinctly described as a string that contains its first and last value, inclusive, separated by a minus sign. (This problem is intentionally restricted to positive integers so that there will be no ambiguity between the minus sign character used as a separator and an actual unary minus sign tacked in front of a digit sequence.) For example, the interval that contains the numbers 5, 6, 7, 8, 9 can be more concisely described as '5-9'. Multiple intervals can be described together by separating their descriptions with commas. An interval that contains only one value is given as only that value. Given a string that contains one or more such comma-separated interval descriptions, guaranteed to be given in sorted ascending order and never overlap with each other, create and return the list that contains all the integers contained inside these intervals. In solving this problem the same as any other problems, it is always better to not have to reinvent the wheel, but always check out first whether the string objects have useful methods to make your job easier... intervals expected results ' ' [ ] '42' [42] '4-6,10-12,16' [4, 5, 6, 10, 11, 12, 16] '1,3-9,12-14,9999' [1, 3, 4, 5, 6, 7, 8, 9, 12, 13, 14, 9999] Please add in comments (#) between the codes to help me understand better.
Expand positive integer intervals
def expand_intervals(intervals):
An interval of consecutive positive integers can be succinctly described as a string that contains its first and last value, inclusive, separated by a minus sign. (This problem is intentionally restricted to positive integers so that there will be no ambiguity between the minus sign character used as a
separator and an actual unary minus sign tacked in front of a digit sequence.) For example, the interval that contains the numbers 5, 6, 7, 8, 9 can be more concisely described as '5-9'. Multiple intervals can be described together by separating their descriptions with commas. An interval that contains only one value is given as only that value.
Given a string that contains one or more such comma-separated interval descriptions, guaranteed to be given in sorted ascending order and never overlap with each other, create and return the list that contains all the integers contained inside these intervals. In solving this problem the same as any other problems, it is always better to not have to reinvent the wheel, but always check out first whether the string objects have useful methods to make your job easier...
| intervals | expected results |
| ' ' | [ ] |
| '42' | [42] |
| '4-6,10-12,16' | [4, 5, 6, 10, 11, 12, 16] |
| '1,3-9,12-14,9999' | [1, 3, 4, 5, 6, 7, 8, 9, 12, 13, 14, 9999] |
Please add in comments (#) between the codes to help me understand better.
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