generating a series of numbers without using any string functions in python

Question

I'm new to python programming and solving some problems in Hacker Rank.. the question was to read an interget N and print in the format of 123....N without using any string methods. I did the following

Answer = ''

for i in range(1,Input+1):
    Answer += str(i)

print Answer

When i looked into the other solution one of the solution given was

print(*range(1,N+1), sep='')

I tried to understand this but could not. I could not find any documentation for *range. can someone pls help..

The `*` is for unpacking lists: https://stackoverflow.com/a/2511332/7517724 — Craig, Mar 21 '20 at 16:48
Also, see here: https://stackoverflow.com/questions/3480184/unpack-a-list-in-python — Craig, Mar 21 '20 at 16:52

score 1 · Accepted Answer · answered Mar 21 '20 at 16:47

The given expression is calling the range() built-in function, plus the unpacking arguments operator * (a.k.a. the "splat" operator), that simply expands a sequence into its individual elements. For example:

print(*range(1, 5+1), sep='')

Will expand to this:

print(1, 2, 3, 4, 5, sep='')

score -1 · Answer 2 · answered Nov 26 '20 at 03:51

-1

You can store the iteration results in a list and remove the comma and print it :

res = ()
for i in range(1,n+1):
    res+=(i,)
    fin = ''.join(map(str,res))
print(fin)

answered Nov 26 '20 at 03:51

Kpyroop

1

generating a series of numbers without using any string functions in python

2 Answers2