>>> filename = ['file1','file2','file3']
>>> fileprefix = 'TRE_'
>>> for item in filename: print('%s%s'%(fileprefix,item))
...
TRE_file1
TRE_file2
TRE_file3
or with list comp
>>> combined = [('%s%s'%(fileprefix,item)) for item in filename]
>>> combined
['TRE_file1', 'TRE_file2', 'TRE_file3']
>>>
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