running black on doomsday

Author: sharpblade4

other/doomsday.py

@@ -9,46 +9,50 @@
   https://en.wikipedia.org/wiki/Doomsday_rule
 """
 
-_doomsday_leap = [4,1,7,4,2,6,4,1,5,3,7,5]
-_doomsday_not_leap = [3,7,7,4,2,6,4,1,5,3,7,5]
-_week_day_names = {  
-               0 : "Sunday",
-               1 : "Monday",
-               2 : "Tuesday",
-               3 : "Wednesday",
-               4 : "Thursday",
-               5 : "Friday",
-               6 : "Saturday"
-} 
+_doomsday_leap = [4, 1, 7, 4, 2, 6, 4, 1, 5, 3, 7, 5]
+_doomsday_not_leap = [3, 7, 7, 4, 2, 6, 4, 1, 5, 3, 7, 5]
+_week_day_names = {
+    0: "Sunday",
+    1: "Monday",
+    2: "Tuesday",
+    3: "Wednesday",
+    4: "Thursday",
+    5: "Friday",
+    6: "Saturday",
+}
 
 
 def get_week_day(year: int, month: int, day: int) -> str:
-    """ Returns the week-day name out of a given date.
-    
+    """Returns the week-day name out of a given date.
+
     >>> get_week_day(2020, 10, 24)
     Saturday
     >>> get_week_day(2017, 10, 24)
     Tuesday
-    
+
     """
     # minimal input check:
-    assert len(str(year)) > 2, 'Please supply year in YYYY format'
-    assert 1 <= month <= 12, 'Invalid month value, please give a number between 1 to 12'
-    assert 1 <= day <= 31, 'Invalid day value, please give a number between 1 to 31' 
+    assert len(str(year)) > 2, "Please supply year in YYYY format"
+    assert 1 <= month <= 12, "Invalid month value, please give a number between 1 to 12"
+    assert 1 <= day <= 31, "Invalid day value, please give a number between 1 to 31"
 
     # Doomsday algorithm:
     century = year // 100
     century_anchor = (5 * (century % 4) + 2) % 7
     centurian = year % 100
     centurian_m = centurian % 12
-    dooms_day = ((centurian // 12) + centurian_m + 
-                 (centurian_m // 4) + century_anchor) % 7
-    day_anchor = _doomsday_not_leap[month - 1] if (year % 4 != 0) or (centurian == 0 
-                 and (year % 400) == 0) else _doomsday_leap[month - 1]
+    dooms_day = (
+        (centurian // 12) + centurian_m + (centurian_m // 4) + century_anchor
+    ) % 7
+    day_anchor = (
+        _doomsday_not_leap[month - 1]
+        if (year % 4 != 0) or (centurian == 0 and (year % 400) == 0)
+        else _doomsday_leap[month - 1]
+    )
     week_day = (dooms_day + day - day_anchor) % 7
     return _week_day_names[week_day]
 
 
-if __name__ == '__main__':  
+if __name__ == "__main__":
     # unit-test:
     assert get_week_day(2020, 10, 24) == "Saturday"