The `bisect_left()` function in the `sortedcontainers.SortedList` module of Python performs a binary search for a specified value in a sorted list and returns the index where the value should be inserted to maintain sorted order. If the value already exists in the list, it returns the leftmost index of occurrence. This function is useful for finding the insertion point for a new element or locating the first occurrence of a value in a sorted list efficiently.
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