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# http://c...content-available-to-author-only...e.com/questions/51984/stretching-words/52011#52011
 
def f(s,t):
 for c in t:s=s.replace(c,'%',1)
 print s.replace('%','%s')%*(x*2for x in t)
 
f('abcdefghij', ['a','b','c'])
#output: aabbccdefghij
 
f('lizard', ['i','a','r','d'])
#output: liizaarrdd
 
f('coconut', ['c','o'])
#ouput: ccooconut or coccoonut or ccocoonut
 
f('onomatopoeia', ['o','o','a','o','o'])
#output: oonoomaatoopooeia
 
f('onomatopoeia', ['o','a','o'])
#output: oonomaatoopoeia or onoomaatoopoeia or oonomaatopooeia etc.

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/py_compile.py", line 117, in compile
    raise py_exc
py_compile.PyCompileError:   File "prog.py", line 5
    print s.replace('%','%s')%*(x*2for x in t)
                              ^
SyntaxError: invalid syntax

Standard output is empty