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f=lambda s:[a*s.count(a)for a in{*s}-{' '}]
 
print(f('Ah, abracadabra!'))
# -> ['rr', 'bb', ',', 'c', 'A', 'h', 'aaaaa', 'd', '!']
 
print(f('\\o/\\o/\\o/'))
# -> ['///', 'ooo', '\\\\\\']
# (the extra backslashes are to escape a single backslash)
 
print(f('A man, a plan, a canal: Panama!'))
# -> ['aaaaaaaaa', 'p', 'P', 'nnnn', 'mm', ':', 'A', 'c', ',,', 'll', '!']
 
print(f('"Show me how you do that trick, the one that makes me scream" she said'))
# -> ['tttttt', 'hhhhhh', 'u', 'ooooo', ',', 'cc', 'kk', 'eeeeeee', 'ii', 'aaaaa',
#     'rr', 'dd', 'n', 'ssss', 'mmmm', 'ww', '""', 'y', 'S']

Traceback (most recent call last):
  File "/usr/lib/python3.4/py_compile.py", line 124, in compile
    _optimize=optimize)
  File "<frozen importlib._bootstrap>", line 1532, in source_to_code
  File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
  File "./prog.py", line 1
    f=lambda s:[a*s.count(a)for a in{*s}-{' '}]
                                     ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.4/py_compile.py", line 128, in compile
    raise py_exc
py_compile.PyCompileError:   File "./prog.py", line 1
    f=lambda s:[a*s.count(a)for a in{*s}-{' '}]
                                     ^
SyntaxError: invalid syntax

Standard output is empty