@@ -673,7 +673,7 @@ def _run_interface(self, runtime):
673673 data_dtype = nb .load (self .inputs .source_file [0 ]).get_data_dtype ()
674674 except Exception : # noqa: BLE001
675675 LOGGER .warning (
676- f 'Could not get data type of file { self .inputs .source_file [0 ]} '
676+ 'Could not get data type of file %s' , self .inputs .source_file [0 ]
677677 )
678678 data_dtype = None
679679
@@ -682,8 +682,10 @@ def _run_interface(self, runtime):
682682 orig_dtype = nii .get_data_dtype ()
683683 if orig_dtype != data_dtype :
684684 LOGGER .warning (
685- f'Changing { Path (dest_file ).name } dtype '
686- f'from { orig_dtype } to { data_dtype } '
685+ 'Changing %s dtype from %s to %s' ,
686+ Path (dest_file ).name ,
687+ orig_dtype ,
688+ data_dtype ,
687689 )
688690 # coerce dataobj to new data dtype
689691 if np .issubdtype (data_dtype , np .integer ):
@@ -1186,7 +1188,7 @@ def _run_interface(self, runtime):
11861188 data_dtype = nb .load (self .inputs .source_file [0 ]).get_data_dtype ()
11871189 except Exception : # noqa: BLE001
11881190 LOGGER .warning (
1189- f 'Could not get data type of file { self .inputs .source_file [0 ]} '
1191+ 'Could not get data type of file %s' , self .inputs .source_file [0 ]
11901192 )
11911193 data_dtype = None
11921194
@@ -1195,7 +1197,7 @@ def _run_interface(self, runtime):
11951197 orig_dtype = nii .get_data_dtype ()
11961198 if orig_dtype != data_dtype :
11971199 LOGGER .warning (
1198- f 'Changing { out_file } dtype from { orig_dtype } to { data_dtype } '
1200+ 'Changing %s dtype from %s to %s' , out_file , orig_dtype , orig_dtype
11991201 )
12001202 # coerce dataobj to new data dtype
12011203 if np .issubdtype (data_dtype , np .integer ):
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