old_contents: from datetime import date as vanilla_date
  from dates.base import BasicBCEDate
  
  first_julian_date = BasicBCEDate(-45, 1, 1)
  
  first_vanilla_date = vanilla_date(1, 1, 1)
  last_vanilla_date = vanilla_date(9999, 12, 31)
  
  julian_day_number_of_first_vanilla_date = 1721423
  julian_day_number_of_last_vanilla_date = julian_day_number_of_first_vanilla_date + (last_vanilla_date - first_vanilla_date).days
  
new_contents: from datetime import date as vanilla_date
  from dates.base import BasicBCEDate
  
  first_julian_date = BasicBCEDate(-45, 1, 1)
  
  first_vanilla_date = vanilla_date(1, 1, 1)
  last_vanilla_date = vanilla_date(9999, 12, 31)
  
  julian_day_number_of_first_vanilla_date = 1721423
  julian_day_number_of_last_vanilla_date = (
      julian_day_number_of_first_vanilla_date
      + (last_vanilla_date - first_vanilla_date).days
  )
  
subject: Fix long line [flake8].