STY: Further simplification

Co-authored-by: Chris Markiewicz <[email protected]>

nibabel/tests/test_nifti1.py

@@ -538,8 +538,7 @@ def test_slice_times(self):
         hdr.set_slice_duration(0.1)
         # We need a function to print out the Nones and floating point
         # values in a predictable way, for the tests below.
-        _stringer = lambda val: (val is not None and f'{val:2.1f}') or None
-        _print_me = lambda s: list(map(_stringer, s))
+        _print_me = lambda s: [val if val is None else f'{val:2.1f}' for val in s]
         # The following examples are from the nifti1.h documentation.
         hdr['slice_code'] = slice_order_codes['sequential increasing']
         assert _print_me(hdr.get_slice_times()) == [