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| Section | Objectives |
|---|---|
| Topic 1: Object-Oriented Programming | - Attributes and Methods - Inheritance - Constructors (__init__) - Classes and Objects - Encapsulation |
| Topic 2: Control Structures | - Loops (for, while) - Conditional Statements (if, elif, else) - Loop Control (break, continue, pass) - Nested Conditionals and Loops |
| Topic 3: File Handling and Exceptions | - Custom Exceptions - Reading and Writing Files - Exception Handling (try, except, finally) |
| Topic 4: Data Structures | - String Manipulation - Dictionaries - Lists and List Operations - Sets - Tuples |
| Topic 5: Python Fundamentals | - Variables and Data Types - Operators and Expressions - Input/Output Operations - Type Conversion |
| Topic 6: Testing and Debugging | - Trace Errors - Unit Testing Concepts - Debugging Techniques |
| Topic 7: Functions | - Return Values - Scope (local and global) - Parameters and Arguments - Recursion - Function Definition and Call |
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NEW QUESTION # 42
Write a complete function reverse_string(text) that takes a string and returns it reversed.
For example, reverse_string( " hello " ) should return " olleh " .
def reverse_string(text):
# TODO: Return the reversed string
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: Python slicing can be used to reverse a string.
Step 3: The slice [::-1] means start at the end of the string and move backward by one character at a time.
Step 4: Return text[::-1].
Correct code:
def reverse_string(text):
return text[::-1]
Example:
print(reverse_string( " hello " ))
Output:
olleh
NEW QUESTION # 43
Which Python data structure contains only unique elements and does not support indexing?
Answer: C
Explanation:
A set is a Python data structure that stores only unique elements. This means duplicate values are automatically removed.
Example:
numbers = {1, 2, 2, 3}
print(numbers)
Output:
{1, 2, 3}
The duplicate value 2 appears only once in the set.
Sets are also unordered, so they do not support indexing like lists or tuples do. For example, numbers[0] would cause an error because sets are not accessed by position.
The official Python documentation describes sets as unordered collections with no duplicate elements.
Therefore, the correct answer is D. Set.
NEW QUESTION # 44
Complete the function get_second_item(items) that takes a list and returns the second item. Assume the input is always a list containing at least two elements.
For example, get_second_item([10, 20, 30]) should return 20.
def get_second_item(items):
# TODO: Return the second item from the list
pass
Answer:
Explanation:
See the Step by Step Solution below in Explanation.
Explanation:
Step 1: Python list indexing starts at 0.
Step 2: The first item is at index 0.
Step 3: The second item is at index 1.
Step 4: Return the value at index 1.
Correct code:
def get_second_item(items):
return items[1]
Example:
print(get_second_item([10, 20, 30]))
Output:
20
NEW QUESTION # 45
Which Python data structure cannot be modified after creation?
Answer: C
Explanation:
Atupleis immutable, which means it cannot be changed after it is created.
Example:
coordinates = (10, 20)
After this tuple is created, its elements cannot be modified directly. Python's data model documentation explains that tuples are immutable, while lists and dictionaries are mutable.
Therefore, the correct answer isC. Tuple.
NEW QUESTION # 46
Which type of loop is designed for iterating a specific number of times?
Answer: C
Explanation:
A for loop is commonly used when a program needs to repeat code for each item in a sequence or for a specific number of times using range().
Example:
for number in range(5):
print(number)
This loop runs 5 times. Python's documentation explains that the for statement iterates over items of a sequence or iterable.
Therefore, the correct answer isB. for loop.
NEW QUESTION # 47
......
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