Feb2019 Round

Question 1

deleteing elements from a set

Answer 1

set.discard(x) or set.remove(x)

Question 2

difference between set.remove and set.discard

Answer 2

set. discard - no error if x is not there

set. remove - error if x is not there

Question 3

adding elements to the set

Answer 3

set.update or set.add

Question 4

difference between set.update and set.add

Answer 4

set. update - arg must be iteratble

set. add - arg must be a singleton

Question 5

removing elements from a list when you know the index

Answer 5

del(a[index])

Question 6

removing elements from list by value (say value is x)

Answer 6

a.remove(x)

Question 7

add elements to the end of the list

Answer 7

list.append(x) or list.extend(x)

Question 8

difference between list.append and list.extend

Answer 8

list. extend() –> needs an iterable

list. append() –> takes only a singleton

Question 9

delete value from a dict with key = k

Answer 9

del(d[k])

Question 10

what is the difference between range and xrange?

Answer 10

xrange produces one element at a time as and when you need it whereas range creates all at once.

Question 11

getting value of an element with key k from dict d. return 0 if k not present in d

Answer 11

d.get(k,0)