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  1. # your code goes here
  2. # your code goes here
  3. def concatenate(*lists):
  4.     lengths = map(len,lists)
  5.     newlen = sum(lengths)
  6.     newlist = [None]*newlen
  7.     start = 0
  8.     end = 0
  9.     for l,n in zip(lists,lengths):
  10.         end+=n
  11.         newlist[start:end] = l
  12.         start+=n
  13.     return newlist
  14.  
  15. print concatenate("123","456","789")
Success #stdin #stdout 0.01s 7728KB
comments (?)
stdin 
Standard input is empty
stdout 
['1', '2', '3', '4', '5', '6', '7', '8', '9']
https://ideone.com/Mi3UyL
language:
Python (cpython 2.7.16)
created:
11 years ago
visibility:
secret

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