Free Data Science with Python (Basic) Questions and Answers

Question 1

When is ___ It ____ function is called, in Python

Accepted Answer

If ___init___ is customized by user

Answer

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

Accepted Answer

Tree

Answer

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

Accepted Answer

Jump to loop's else block

Answer

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?

Accepted Answer

Lasso

Answer

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.

Accepted Answer

Items

Answer

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.

Data Science with Python Certification Practice Test

Data Science with Python Certification Practice Test

Free Data Science with Python (Basic) Questions and Answers