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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Data Structures and Input/Output | 20% | - User input and output operations - Lists, tuples, dictionaries, sets - Basic file handling |
| Topic 2: Loops and Iteration | 20% | - Break, continue, and pass statements - For loops and while loops - Iterating over sequences |
| Topic 3: Functions and Modular Programming | 20% | - Variable scope and code reuse - Parameters, arguments, and return values - Defining and calling functions |
| Topic 4: Control Flow and Decision Making | 20% | - Conditional expressions - If, elif, else statements - Comparisons and logical operators |
| Topic 5: Variables, Data Types, and Basic Operations | 20% | - Variables and assignment - Data types: integers, floats, strings, booleans - Arithmetic operations and type conversion |
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問題 #39
Write a complete function calculate_average(grades) that takes a list of grades and returns the average as a float.
For example, calculate_average([85, 92, 78]) should return 85.0.
def calculate_average(grades):
# TODO: Calculate and return the average grade as a float
pass
答案：
解題說明：
See the Step by Step Solution below in Explanation.
Explanation:
Step 1: The function receives one parameter named grades, which is a list of numbers.
Step 2: Use sum(grades) to add all the grades together.
Step 3: Use len(grades) to count how many grades are in the list.
Step 4: Divide the total by the number of grades.
Correct code:
def calculate_average(grades):
return sum(grades) / len(grades)
Example:
print(calculate_average([85, 92, 78]))
Output:
85.0
問題 #40
How can the first four characters be extracted from the string ' computer ' ?
答案：D
解題說明：
Python strings are sequences, and sequence values can be accessed using indexing and slicing.
The first character in a Python string has index 0. To extract the first four characters from ' computer ' , the slice should start at index 0 and stop at index 4.
Example:
' computer ' [0:4]
Result:
' comp '
In Python slicing, the start index is included, but the stop index is excluded. So [0:4] includes characters at indexes 0, 1, 2, and 3.
The official Python documentation explains that slicing with a[start:stop] selects items from the start index up to, but not including, the stop index.
Therefore, the correct answer is A. ' computer ' [0:4].
問題 #41
Which data type does the expression 5 > 3 evaluate to in Python?
答案：B
解題說明：
In Python, comparison expressions such as 5 > 3 evaluate to aBooleanvalue.
The expression:
5 > 3
checks whether 5 is greater than 3. Since this statement is true, Python returns:
True
True and False are Boolean values in Python.
Therefore, the correct answer isC. Boolean.
問題 #42
A program needs to update all values in a list by adding 5 to each number. Which for loop structure accomplishes this task?
答案：A
解題說明：
To update the actual values inside a list, the program must update each value by itsindex.
The correct code is:
for i in range(len(numbers)):
numbers[i] = numbers[i] + 5
Here, range(len(numbers)) produces valid index positions for the list. The variable i is used to access and update each list element.
Example:
numbers = [10, 20, 30]
for i in range(len(numbers)):
numbers[i] = numbers[i] + 5
print(numbers)
Output:
[15, 25, 35]
Option A does not correctly update the original list:
for number in numbers:
number = number + 5
This changes only the temporary loop variable number, not the actual elements stored inside the list.
Therefore, the correct answer isB.
問題 #43
Which terminal command is used to navigate to a different directory before running a Python script?
答案：C
解題說明：
The command cd means "change directory." It is used in a terminal to move from one folder to another.
Example:
cd Desktop
After navigating to the correct folder, a Python script can be run with a command such as:
python script.py
Therefore, the correct answer isC. cd.
問題 #44
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