Your GPS app returns coordinates as a tuple:coords = (40.7128, -74.0060) You want to change the latitude from 40.7128 to 41.0000. Which code snippet is valid?

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BlackTom AI · Accepted Answer

We start by restating the problem: we have a GPS coordinate pair as a tuple coords = (40.7128, -74.0060) and we want to change the latitude (the first element) from 40.7128 to 41.0000. We need to evaluate each option for validity in Python and whether it achieves the desired result.
Option a: coords[0] = 41.0000 print(coords)
This attempts to assign a new value to an element of a tuple. Tuples are immutable in Python, meaning their elements cannot be changed after creation. Therefore, this line would raise a TypeError at runtime, and nothing would be printed. It is not a valid way to modify a tuple’s content.
Option b: coords = (41.0000,) + (coords[:1]) print(coords)
Here a new tuple is formed by concatenation. coords[:1] yields a one-element tuple containing the original first element (40.7128,), so the result would be (41.0,) + (40.7128,) which equals (41.0, 40.7128). This does change the first value, but it inadvertently places the old first value as the second element, producing (41.0, 40.7128) instead of the desired (41.0, -74.0060). So while it’s syntactically valid, it does not achieve the intended latitude change.
Option c: coords[0] = 41.0000 print(coords)
Similar to option a, this attempts to assign to an element of the tuple. It suffers from the same immutability issue of tuples, leading to a TypeError. This is not a valid modification approach.
Option d: coords = (41.0000,) + (coords[1:]) print(coords)
This option creates a new tuple by taking the desired first element (41.0000) and concatenating it with the slice coords[1:], which yields (-74.0060,). The resulting tuple is (41.0000, -74.0060), which correctly represents the updated latitude while preserving the longitude. This is a valid way to “replace” the first element by constructing a new tuple with the desired value.
In summary, a and c fail due to the immutable nature of tuples; b is syntactically valid but yields an incorrect coordinate pair; d correctly produces the intended coordinate change by building a new tuple with the updated first element and the remaining elements. Therefore, the most appropriate and correct snippet for achieving the desired latitude change is the one in option d.

Your GPS app returns coordinates as a tuple:coords = (40.7128, -74.0060) You want to change the latitude from 40.7128 to 41.0000. Which code snippet is valid?单项选择题

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