Question

Lists in python have 2 methods: s.pop([i]) where i is the position in the list to be “popped”, and s.remove(x) that are somewhat similar. (Check the notes for a description of what they do.) (10 points total)

1. What are 2 important differences between these 2 functions? (2 points)

We looked at a program that implemented the Sieve of Eratosthenes using a list. The program below implements the same algorithm, but uses pop() and remove to do it. The basic idea is to locate the “next” prime, remove it from x and add it tp primes, and then remove all of its multiples from x. The program terminates when x is empty. (8 points)

Fill in the blanks (b-d).

x=[]

for i in range(2,100):

    x.append(i)

print(x)

primes=[]

while ______b______:

    k=x._____c__________

    primes.append(k)

    i=1

    while i*k<=99:

        if i*k in x:

            x.____d______(e)

        i+=1

print(primes)

Answer:

a=

b=

c=

d=

e=

Answer 1

Difference between pop() and remove() functions :

pop():

its remove element from list by index.

if you want to remove element of ith index then pop(i)

if you did not pass anything in pop function then it remove last element from list

remove():

it removes element from list by value

if you want to remove j value from list then you can write like this remove(j)

S.No	Pop()	Remove()
1.	It removes element by index	it removes element by value
2.	when you did not pass anything to function, it removes last element of list	when you did not pass anything to function, it gives error

x=[]
for i in range(2,100):
x.append(i)
print(x)
primes=[]
while x:
k=x.pop(0)
primes.append(k)
i=1
while i*k<=99:
if i*k in x:
x.remove(i*k)
i+=1
print(primes)

In [10]: 6 1 X=[] 2 for i in range(2,100): 3 X.append(i) 4 print(x) 5 primes=[] while x: 7 k=x.pop() 8 primes.append(k) i=1 10 while i*k<=99: 11 if i*k in x: 12 X.remove(i*k) 13 i+=1 14 print (primes 15 9 16 [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 3 5, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99] [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97]

answers:

b=x

c=x.pop(0)

d=remove

e=i*k