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| Section | Objectives |
|---|---|
| Topic 1: Python Programming Fundamentals | - Variables and data types - Syntax and basic structure - Operators and expressions |
| Topic 2: Debugging and Testing Basics | - Error identification and correction - Basic testing concepts |
| Topic 3: Data Structures | - Basic data manipulation - Lists, tuples, dictionaries |
| Topic 4: File Handling and Exceptions | - Exception handling (try/except) - Reading and writing files |
| Topic 5: Control Flow | - Loops (for, while) - Conditional statements (if / elif / else) |
| Topic 6: Introduction to Object-Oriented Programming | - Basic OOP concepts - Classes and objects |
| Topic 7: Functions and Modularity | - Modules and imports - Function definition and scope |
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問題 #40
Which for loop correctly iterates through a list of student names?
答案：A
解題說明：
The correct Python for loop syntax uses the keyword in.
Correct code:
for name in [ ' Alice ' , ' Bob ' , ' Carol ' ]:
print(name)
This loop processes each name in the list one at a time. Python's documentation explains that a for statement iterates over the items of a sequence or iterable.
Therefore, the correct answer isA. for name in [ ' Alice ' , ' Bob ' , ' Carol ' ]:.
問題 #41
A program uses this while loop to count down:
count = 5
while count > 0:
print(count)
Which issue is preventing the loop from working correctly?
答案：B
解題說明：
The loop condition is:
while count > 0:
At the start, count is 5, so the condition is true. The program prints the value of count.
However, inside the loop, the value of count is never changed. That means count always stays 5, so the condition count > 0 is always true. As a result, the loop runs forever.
A corrected version would be:
count = 5
while count > 0:
print(count)
count = count - 1
This decreases count by 1 during each loop iteration. Eventually, count becomes 0, and the condition count >
0 becomes false.
Therefore, the correct answer isB. It runs infinitely because count is never modified.
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：C
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
How can the first four characters be extracted from the string ' computer ' ?
答案：B
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 #44
Complete the function double_number(num) that takes one number parameter and returns double that number.
For example, double_number(5) should return 10.
def double_number(num):
# TODO: Return double the input number
# Example: double_number(5) should return 10
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 num.
Step 2: To double a number, multiply it by 2.
Step 3: The function should return the result using the return statement.
Correct code:
def double_number(num):
return num * 2
Example:
print(double_number(5))
Output:
10
問題 #45
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