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| Section | Objectives |
|---|---|
| Python Fundamentals | - Variables and Data Types - Type Conversion - Input/Output Operations - Operators and Expressions |
| Control Structures | - Loop Control (break, continue, pass) - Nested Conditionals and Loops - Loops (for, while) - Conditional Statements (if, elif, else) |
| Testing and Debugging | - Unit Testing Concepts - Debugging Techniques - Trace Errors |
| Object-Oriented Programming | - Attributes and Methods - Classes and Objects - Inheritance - Encapsulation - Constructors (__init__) |
| File Handling and Exceptions | - Reading and Writing Files - Exception Handling (try, except, finally) - Custom Exceptions |
| Data Structures | - String Manipulation - Tuples - Lists and List Operations - Dictionaries - Sets |
| Functions | - Parameters and Arguments - Recursion - Function Definition and Call - Return Values - Scope (local and global) |
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NEW QUESTION # 14
A dictionary prices = { ' apple ' : 1.50, ' banana ' : 0.75, ' orange ' : 2.00} needs to have all values increased by
0.25. Which code correctly accomplishes this task?
Answer: A
Explanation:
In Python, iterating directly over a dictionary gives itskeys. In this dictionary, the keys are:
' apple '
' banana '
' orange '
To update each price, the program can loop through each key and use that key to access and change the corresponding value.
Correct code:
prices = { ' apple ' : 1.50, ' banana ' : 0.75, ' orange ' : 2.00}
for item in prices:
prices[item] = prices[ item] + 0.25
print(prices)
Output:
{ ' apple ' : 1.75, ' banana ' : 1.0, ' orange ' : 2.25}
Option B is incorrect because value actually receives each dictionary key, not each dictionary value. Also, assigning to value would not update the dictionary.
Option C is incorrect because item is not defined, and the loop structure is invalid for this task.
NEW QUESTION # 15
Write a complete function word_count(text) that counts and returns the number of words in the given text.
Words are separated by spaces.
For example, word_count( " Hello world Python " ) should return 3.
def word_count(text):
# TODO: Count and return the number of words in text
pass
Answer:
Explanation:
See the Step by Step Solution below in Explanation.
Explanation:
Step 1: The function receives one string parameter named text.
Step 2: Since words are separated by spaces, use the .split() method to split the string into a list of words.
Step 3: Use len() to count how many items are in the list.
Step 4: Return that count.
Correct code:
def word_count(text):
return len(text.split())
Example:
print(word_count( " Hello world Python " ))
Output:
3
NEW QUESTION # 16
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?
Answer: A
Explanation:
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.
NEW QUESTION # 17
Which for loop correctly iterates through a list of student names?
Answer: D
Explanation:
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 ' ]:.
NEW QUESTION # 18
In the code for item in my_list:, what does item represent?
Answer: B
Explanation:
In the loop:
for item in my_list:
print(item)
item represents the current element from my_list during each loop iteration.
For example:
my_list = [ " apple " , " banana " ]
for item in my_list:
print(item)
The loop first processes " apple " , then " banana " . Python's documentation explains that a for statement iterates over the items of a sequence in order.
Therefore, the correct answer isB. The current element being processed.
NEW QUESTION # 19
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