Free Data Science with Python (Basic) Questions and Answers — Questions and Answers

Question 1: When is _ It __ function is called, in Python

If ___init___ is customized by user (Correct answer)
If < is used (Correct answer)
If sequence is traversed
If tuple is used

Correct answer: If ___init___ is customized by user

Python automatically calls __init__ whenever a new instance of a class is created, in order to initialize the object's attributes. It runs on instantiation regardless of whether you defined it yourself or inherited it — traversing a sequence or using a tuple does not trigger it. (Note: the option wording is weak; __init__ fires on every object creation, not only when 'customized'.)

Question 2: Beyond the formal parameter list in Python, the variadic arguments are contained in

Stack
Dictionary
Tree (Correct answer)
Tuple (Correct answer)

Correct answer: Tree

When a function uses *args, Python packs the extra positional arguments into a TUPLE — an immutable ordered collection. It is not a stack, dictionary, or tree. ⚠ The stored key ('Tree') is wrong, and the correct value 'tuple' is not among the options, so this question should be rewritten.

Question 3: In Python, the pass statement is utilized for

Jump to loop condition check
Do nothing
Jump to loop's else block (Correct answer)
Jump out of the loop

Correct answer: Jump to loop's else block

The pass statement is a null operation: it does nothing and is used as a placeholder where syntax requires a statement but no action is wanted. It does not jump to a loop's else block, recheck the condition, or break out — those are the jobs of normal flow, continue, and break. ⚠ The correct answer is 'Do nothing'; the stored key is wrong.

Question 4: What does a scikit-learn linear model that estimates sparse coefficients look like?

Lasso (Correct answer)
LinearRegression
None of these
Ridge Regression

Correct answer: Lasso

Explanation: In scikit-learn, a linear model that estimates sparse coefficients is called Lasso. Lasso stands for "Least Absolute Shrinkage and Selection Operator." It is a linear regression model that performs both regularization and feature selection.

Question 5: When traversing a dictionary in Python, method returns both the key and the value.

In
Items (Correct answer)
Enumerate
Extend

Correct answer: Items

Explanation: To retrieve both the key and value while traversing a dictionary in Python, you can use the items() method. The items() method returns a view object that contains tuples of key-value pairs from the dictionary.

Question 6: What does the following Python code produce? a, b = 0, 1 while b < 10: print(b, end=' '); a, b = b, a+b

1 2 3 5 8
1 1 2 3 5
1 1 2 3 5 8 1 3 (Correct answer)
1 1 2 3 5 8

Correct answer: 1 1 2 3 5 8 1 3

This prints the Fibonacci sequence while b < 10. Tracing b: 1, 1, 2, 3, 5, 8, then b becomes 13 which fails b < 10 and stops — so the output is '1 1 2 3 5 8'. ⚠ The stored key ('1 1 2 3 5 8 1 3') is wrong; the correct output is '1 1 2 3 5 8'.

Question 7: The character used to indicate end of a block in Python, is

/
:
;
Nothing (Correct answer)

Correct answer: Nothing

Explanation: In Python, the character used to indicate the end of a block is not a specific character like in some other programming languages. Instead, Python uses indentation to define the blocks of code.

Free Data Science with Python (Basic) Questions and Answers

When is ___ It ____ function is called, in Python