Build Context and Next-Value Pairs

Task

Write context_next_pairs(values, context_size). context_size is a positive integer. A context is a list of exactly context_size consecutive values. For each context that has one following value, return a pair:

(context, next_value)

Read from left to right. Begin with the first complete context, and stop before any context that would run past the end of values. Do not wrap around and do not use values from separate ends of the list. Return an empty list when no full context has a following value. Do not change the input list.

Example

With a context size of 3, the same input produces two pairs: (["a", "b", "c"], "d") and (["b", "c", "d"], "e"). A context equal to or longer than the input produces no pair.

Your implementation

Edit solution.py and keep this function name and signature:

Return a list whose context items are lists; do not print the result or ask for input. You may assume that context_size > 0.