CODEWITHSUNDEEP
pythonlist
r.hart
r.hart

Reputation: 59

Populating lists in python

I have a loop to populate a list, using a loop format.
I'm supposed to create a list, then - using a loop - populate the list with N elements, and set each list element to its index multiplied by 10.

It is also possible that N will be 0. In this case I'm supposed to output an empty list [], and this what I think is tripping me up. 

list = [N]

for x in range(N):
    innerlist = []
    for y in range(N):
        innerlist.append(list)
    list.append(innerlist)
    if N == 0:
        list = []
print (list)

I thought that the if(N==0) statement would reset the value of the list but it doesn't. I should output [] but instead I output [0].

Upvotes: 3

Views: 22447

Answers (5)

Patrick Atwater
Patrick Atwater

Reputation: 69

>>> N = 10
>>> my_list = [iter * 10 for iter in range(N)]
>>> print(my_list)
[0, 10, 20, 30, 40, 50, 60, 70, 80, 90]
>>> N = 0
>>> my_list = [iter * 10 for iter in range(N)]
>>> print(my_list)
[]

Upvotes: 7

yungmanlungs
yungmanlungs

Reputation: 1

myList = []

if N == 0:
  print(myList)
else:  
  for i in range(N):
    myList.append(i * 10)
  print(myList)

Upvotes: 0

Nicole
Nicole

Reputation: 1

I'm just a beginner myself, but I found this online that matches your question. I have no idea how to format the actual code right, but hopefully this helps!

my_list = []
my_newlist =[]
if N <= 0:
    print(my_list)
else:
    for x in range(N):   
        my_list.append(x)   
        my_newlist= [i* 10 for i in my_list] # not getting the statement 'i * 10 for in i' statement
    print(my_newlist)

[Python] #We provide you with a number N. #Create a list then, using a loop, populate - Pastebin.com. (2017, November 29). Retrieved from https://pastebin.com/2F0zXq6z

Upvotes: -1

GalAbra
GalAbra

Reputation: 5148

If you just add the condition before entering the whole loop, you'll get the expected result:

N = 10
list = []
if (N > 0):
    for i in range(N):
        list.append(i*10)
print(list)
# output: [0, 10, 20, 30, 40, 50, 60, 70, 80, 90]

Upvotes: 0

thomas.mac
thomas.mac

Reputation: 1256

lst = range(8)
innerlst = []


for i in lst:
    if 0 in lst:
       innerlst = []
       continue
    else:
       innerlst.append(i*10)

Upvotes: 1

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