multi_to_single: reformat 'reference_fields' in PEP8 style.

Author: Benjamin Moody

wfdb/io/record.py

@@ -1129,9 +1129,12 @@ def multi_to_single(self, physical, return_res=64):
  n_sig = len(signal_names)
 
  # This will be the field dictionary to copy over.
- reference_fields = {'fmt':n_sig*[None], 'adc_gain':n_sig*[None],
- 'baseline':n_sig*[None],
- 'units':n_sig*[None]}
+ reference_fields = {
+ 'fmt': n_sig * [None],
+ 'adc_gain': n_sig * [None],
+ 'baseline': n_sig * [None],
+ 'units': n_sig * [None],
+ }
 
  # For physical signals, mismatched fields will not be copied
  # over. For digital, mismatches will cause an exception.