What statement accurately describes the difference between a list and a dictionary?

Question

BlackTom AI · Accepted Answer

Let’s analyze what each statement is asserting about lists and dictionaries.

Option 1: 'A list is immutable, while a dictionary is not.' This is incorrect because lists are mutable (you can change, append, or remove elements after creation), and dictionaries are also mutable (you can add, modify, or delete key-value pairs). The claim flips the actual mutability behavior and thus is false.

Option 2: 'A list is created with elements in parentheses, while a dictionary is created with square brackets.' In Python, lists are created with square brackets [] and dictionaries with curly braces {} (or by using dict()). Parens () are used for tuples, not lists or dictionaries. Therefore this option misstates the syntax and is incorrect.

Option 3: 'A list is indexed where as a dictionary is utilized by key.' This captures the fundamental difference: lists use integer indices to access elements, reflecting positional ordering, whereas dictionaries are accessed by keys (which can be strings, numbers, etc.) to retrieve values. This description accurately describes the difference, making it the correct choice.

Option 4: 'A list can only hold integer and float data.' This is false because lists in Python (and most languages) can hold a mix of data types, including strings, booleans, objects, or even other lists or dictionaries. Restricting to numeric types is incorrect.

In summary, the third option correctly states the distinction between how lists and dictionaries are indexed and accessed, while the other options contain factual inaccuracies about mutability, syntax, or acceptable data types.

What statement accurately describes the difference between a list and a dictionary?单项选择题

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