15 min. | Intermediate
Python uses zero-based indexing, meaning the first element has index 0.
Negative indices start from the end of the sequence, with the last element having index -1.
Access nested structures by chaining indices.
Use start:stop to get a portion of a sequence. The stop index is exclusive (not including).
You are given a list of exam_scores. Compute the median of this dataset using indexing.
You are given a dictionary course. The “course_id” contains a long alphanumeric identifier.
Slice the 5th to 14th characters of “course_id”.
Sort the list of data below and return the number that sits 25\% of the way into the sorted list.
Given a 30 \times 30 matrix represented as a list of lists. Access the element a_{15,7}.
A product_code was entered with an extra character “#”. The “#” is an error and it is located at the 27th index of the string.
Create a cleaned version of the string where the “#” is removed.