eClerx Python Developer Trainee Interview Questions and Answers

Generate all valid combinations of parentheses for given n pairs

• Use backtracking to generate all valid combinations of parentheses

• Keep track of the number of open and close parentheses used

• Add open parenthesis if there are remaining open parentheses, add close parenthesis if there are more open than close parentheses

List is mutable, Tuple is immutable in Python.

• List can be modified after creation, Tuple cannot be modified.

• List uses square brackets [], Tuple uses parentheses ().

• List is used for collections of items that may need to be changed, Tuple is used for collections of items that should not change.

• Example: list_example = [1, 2, 3], tuple_example = (4, 5, 6)

Find min and max from a list without using function

• Iterate through the list and compare each element with current min and max values

• Update min and max values accordingly

Iterators are objects that allow iteration over a sequence, generators are functions that yield values one at a time, and lambdas are anonymous functions.

• Iterators are objects that implement the iterator protocol, with methods like __iter__() and __next__().

• Generators are functions that use the yield keyword to return values one at a time, pausing execution between each yield.

• Lambdas are anonymous functions defined usi...read more