| | 49 | |
| | 50 | Certainly! Let's break down the task with an example: |
| | 51 | |
| | 52 | ### Given: |
| | 53 | - You have a list of lists. |
| | 54 | - You want to split each sublist at the point where the sublist starts with a given symbol. |
| | 55 | |
| | 56 | ### Example: |
| | 57 | |
| | 58 | #### Input: |
| | 59 | ```python |
| | 60 | list_of_lists = [ |
| | 61 | ['a', 1, 2, 3], |
| | 62 | ['b', 4, 5, 6], |
| | 63 | ['*', 7, 8, 9], |
| | 64 | ['c', 10, 11], |
| | 65 | ['*', 12, 13], |
| | 66 | ['d', 14, 15, 16] |
| | 67 | ] |
| | 68 | symbol = '*' |
| | 69 | ``` |
| | 70 | |
| | 71 | #### Expected Output: |
| | 72 | ```python |
| | 73 | [ |
| | 74 | [['a', 1, 2, 3], ['b', 4, 5, 6]], |
| | 75 | [['*', 7, 8, 9], ['c', 10, 11]], |
| | 76 | [['*', 12, 13], ['d', 14, 15, 16]] |
| | 77 | ] |
| | 78 | ``` |
| | 79 | |
| | 80 | ### Steps: |
| | 81 | |
| | 82 | 1. **Initialize an empty result list**: This will hold the final split sublists. |
| | 83 | 2. **Iterate through each sublist**: Check if the first element of the sublist is the given symbol. |
| | 84 | 3. **When the symbol is found**: Start a new group in the result list. |
| | 85 | 4. **Continue grouping until the symbol is encountered again**. |
| | 86 | |
| | 87 | ### Python Code Implementation: |
| | 88 | |
| | 89 | ```python |
| | 90 | def split_list_of_lists(list_of_lists, symbol): |
| | 91 | result = [] |
| | 92 | current_group = [] |
| | 93 | |
| | 94 | for sublist in list_of_lists: |
| | 95 | if sublist[0] == symbol and current_group: |
| | 96 | result.append(current_group) |
| | 97 | current_group = [] |
| | 98 | current_group.append(sublist) |
| | 99 | |
| | 100 | if current_group: |
| | 101 | result.append(current_group) |
| | 102 | |
| | 103 | return result |
| | 104 | |
| | 105 | # Example usage |
| | 106 | list_of_lists = [ |
| | 107 | ['a', 1, 2, 3], |
| | 108 | ['b', 4, 5, 6], |
| | 109 | ['*', 7, 8, 9], |
| | 110 | ['c', 10, 11], |
| | 111 | ['*', 12, 13], |
| | 112 | ['d', 14, 15, 16] |
| | 113 | ] |
| | 114 | symbol = '*' |
| | 115 | output = split_list_of_lists(list_of_lists, symbol) |
| | 116 | print(output) |
| | 117 | ``` |
| | 118 | |
| | 119 | ### Output: |
| | 120 | ```python |
| | 121 | [ |
| | 122 | [['a', 1, 2, 3], ['b', 4, 5, 6]], |
| | 123 | [['*', 7, 8, 9], ['c', 10, 11]], |
| | 124 | [['*', 12, 13], ['d', 14, 15, 16]] |
| | 125 | ] |
| | 126 | ``` |
| | 127 | |
| | 128 | This code takes a list of lists and splits it into separate groups whenever a sublist starts with the specified symbol. Each group is then added to the result. The result is a list of these grouped sublists. |