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| Section | Weight | Objectives |
|---|---|---|
| Loops and Iteration | 20% | - Break, continue, and pass statements - Iterating over sequences - For loops and while loops |
| Data Structures and Input/Output | 20% | - Basic file handling - User input and output operations - Lists, tuples, dictionaries, sets |
| Control Flow and Decision Making | 20% | - Comparisons and logical operators - Conditional expressions - If, elif, else statements |
| Variables, Data Types, and Basic Operations | 20% | - Arithmetic operations and type conversion - Variables and assignment - Data types: integers, floats, strings, booleans |
| Functions and Modular Programming | 20% | - Parameters, arguments, and return values - Variable scope and code reuse - Defining and calling functions |
>> Foundations-of-Programming-Python Exam Quizzes <<
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NEW QUESTION # 20
Complete the function get_dict_keys(data) that takes a dictionary and returns a list of all its keys.
For example, get_dict_keys({ " name " : " John " , " age " : 25}) should return [ " name " , " age " ].
def get_dict_keys(data):
# TODO: Return a list of all dictionary keys
pass
Answer:
Explanation:
See the Step by Step Solution below in Explanation.
Explanation:
Step 1: A dictionary stores data as key-value pairs.
Step 2: The .keys() method returns the dictionary's keys.
Step 3: To return the keys as a list, use list(data.keys()).
Correct code:
def get_dict_keys(data):
return list(data.keys())
Example:
print(get_dict_keys({ " name " : " John " , " age " : 25}))
Output:
[ ' name ' , ' age ' ]
NEW QUESTION # 21
Which type of loop repeatedly checks a condition to determine whether to continue?
Answer: D
Explanation:
Awhile looprepeatedly executes a block of code as long as its condition remains true.
Example:
count = 1
while count < = 3:
print(count)
count += 1
In this example, Python checks the condition count < = 3 before each loop iteration. If the condition is true, the loop continues. When the condition becomes false, the loop stops.
A for loop is usually used to iterate over a sequence, such as a list, string, or range. Python does not have a built-in repeat loop construct.
Therefore, the correct answer isB. while loop.
NEW QUESTION # 22
A program processes file names and extracts the last 3 characters representing the file extension. For example, files ' document.pdf ' and ' image.png ' would return ' pdf ' and ' png ' , respectively. Which slicing approach would work for either of the provided files?
Answer: B
Explanation:
The slice filename[-3:] extracts the last three characters from a string.
Example:
filename = " document.pdf "
print(filename[-3:])
Output:
pdf
Another example:
filename = " image.png "
print(filename[-3:])
Output:
png
Python strings support slicing, and negative indexes count from the end of the string.
Therefore, the correct answer isC. filename[-3:] .
NEW QUESTION # 23
Which data type does the expression 5 > 3 evaluate to in Python?
Answer: A
Explanation:
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.
NEW QUESTION # 24
Fix the off-by-one error in this function that should return the first 3 characters of a string.
def first_three(text):
return text[0:2]
Answer:
Explanation:
See the Step by Step Solution below in Explanation.
Explanation:
Step 1: Python string slicing uses this format:
text[start:stop]
Step 2: The start index is included.
Step 3: The stop index is excluded.
Step 4: To return the first 3 characters, start at index 0 and stop at index 3.
Correct code:
def first_three(text):
return text[0:3]
Simplified correct code:
def first_three(text):
return text[:3]
Example:
print(first_three( " Python " ))
Output:
Pyt
NEW QUESTION # 25
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