HCLTech Python Developer Intern Interview Questions and Answers

Factorial can be calculated using a loop by multiplying numbers from 1 to n.

• Initialize a variable to 1

• Use a loop to multiply the variable with numbers from 1 to n

• Return the variable

Count the number of pairs in an array whose sum is equal to a given number k.

• Iterate through the array and for each element, check if k minus the element exists in the array.

• Use a hash table to store the frequency of each element in the array.

• If the array contains duplicates, handle them separately to avoid overcounting.

• Time complexity can be improved to O(n) using a two-pointer approach.

Abstraction is the process of hiding complex implementation details and exposing only the necessary information.

• Abstraction helps in reducing complexity and increasing efficiency.

• It allows us to focus on the essential features of an object or system.

• Abstraction can be achieved through abstract classes, interfaces, and encapsulation.

• For example, a car can be abstracted as a vehicle with certain properties and methods.

• Ab...read more

Hiding implementation means keeping the internal details of a class or function hidden from the outside world.

• It is a fundamental principle of object-oriented programming.

• It helps in achieving encapsulation and abstraction.

• It prevents the user from accessing the internal workings of a class or function.

• Examples include private variables and methods in a class.

• It allows for easier maintenance and modification of code.

• It...read more