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| Section | Objectives |
|---|---|
| Data Structures | - Lists and List Operations - String Manipulation - Tuples - Sets - Dictionaries |
| Testing and Debugging | - Unit Testing Concepts - Debugging Techniques - Trace Errors |
| Python Fundamentals | - Type Conversion - Variables and Data Types - Input/Output Operations - Operators and Expressions |
| Object-Oriented Programming | - Constructors (__init__) - Inheritance - Attributes and Methods - Encapsulation - Classes and Objects |
| Control Structures | - Loop Control (break, continue, pass) - Conditional Statements (if, elif, else) - Nested Conditionals and Loops - Loops (for, while) |
| File Handling and Exceptions | - Reading and Writing Files - Custom Exceptions - Exception Handling (try, except, finally) |
| Functions | - Parameters and Arguments - Function Definition and Call - Scope (local and global) - Recursion - Return Values |
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61. Frage
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?
Antwort: C
Begründung:
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.
62. Frage
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
Antwort:
Begründung:
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
63. Frage
Which keyword is used to exit a loop prematurely in Python?
Antwort: B
Begründung:
The break keyword exits a loop immediately before the loop condition naturally becomes false or before all items have been processed.
Example:
for number in range(10):
if number == 5:
break
print(number)
When number becomes 5, the loop stops. Python's control-flow documentation explains the use of break in loops.
Therefore, the correct answer isB. break.
64. Frage
Which loop structure processes every individual item in a list called grades?
Antwort: D
Begründung:
The loop:
for grade in grades:
print(grade)
processes every individual item in the list grades.
The variable grade represents the current item being processed. Python's documentation explains that a for statement iterates over the items of a sequence in order.
Therefore, the correct answer isB. for grade in grades:.
65. Frage
Which components are required in every Python for loop?
Antwort: C
Begründung:
A Python for loop is used to iterate over an iterable object, such as a list, tuple, string, dictionary, set, or range() object.
A basic for loop needs:
A loop variable
An iterable object
An indented code block
Example:
for number in range(3):
print(number)
In this example:
number is the loop variable.
range(3) is the iterable.
print(number) is the indented code block that runs during each loop iteration.
According to the official Python documentation, the for statement is a construct that works with iterable objects.
Therefore, the correct answer is A. A variable, an iterable, and an indented code block.
66. Frage
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