Explore Python list slicing in the context of the PCEP-30-02 exam. Learn how data[1:3] works and why [404, 3.03] is the correct output.
Table of Contents
Question
What is the expected output of the following code?
data = ['Peter', 404, 3.03, 'Wellert', 33.3] print(data[1:3])
A. [‘Peter’, 404, 3.03, ‘Wellert’, 33.3]
B. None of the above.
C. [404, 3.03]
D. [‘Peter’, ‘Wellert’]
Answer
C. [404, 3.03]
Explanation
In Python, list slicing is a powerful feature that allows you to extract a portion of a list. The syntax for list slicing is list[start:end], where:
- ‘start’ is the index where the slice begins (inclusive)
- ‘end’ is the index where the slice ends (exclusive)
In this case, data[1:3] means:
- Start at index 1 (the second element, since Python uses 0-based indexing)
- End before index 3 (so include elements at index 1 and 2, but not 3)
Let’s break down the list:
data = [‘Peter’, 404, 3.03, ‘Wellert’, 33.3]
0 1 2 3 4 (indices)
data[1:3] will return:
- Element at index 1: 404
- Element at index 2: 3.03
Therefore, the result is [404, 3.03].
This question tests your understanding of:
- List indexing in Python (0-based)
- List slicing syntax and behavior
- How the end index in slicing is exclusive
This concept is crucial for the PCEP-30-02 exam and Python programming in general, as list manipulation is a fundamental skill. Remember that list slicing creates a new list containing the specified elements, which can be very useful for data processing and algorithm implementation.
Python Institute PCEP-30-02 certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the Python Institute PCEP-30-02 exam and earn Python Institute PCEP-30-02 certification.