Joining the numbers to form a new number

Question

If I define a function that yields a list of numbers and I want to join those numbers to form a new number what should I do?

For example: if f(6) == [2, 3, 5], I want 235 as result.

@jonrsharpe I dont know how to join things in list. That's the problem. — Satvik Mashkaria, Nov 18 '14 at 11:42
So what research have you done? Had you bothered to search, for example, you might have found http://stackoverflow.com/q/12453580/3001761 — jonrsharpe, Nov 18 '14 at 11:43

score 1 · Answer 1 · answered Nov 18 '14 at 11:41

1

Use str.join with for loop

l = [1, 2, 3]
In [75]: int(''.join(str(i) for i in l))
Out[75]: 235

Or use simple math:-

In [77]: s = 0

In [78]: for x in l:
   ....:     s = s*10 + x
   ....:     

In [79]: s
Out[79]: 235

answered Nov 18 '14 at 11:41

Vishnu Upadhyay

score 0 · Answer 2 · answered Nov 18 '14 at 11:50

0

Assuming the number you want to to represent is in base10, you can do:

sum([x*10**(len(l)-i-1) for i,x in enumerate(l)])

answered Nov 18 '14 at 11:50

@SatvikMashkaria You mean the basis? like with hexadecimals? This should work for any length of l. – Nov 18 '14 at 12:03

2 Answers2