add leap year

Author: realDuYuanChao

maths/leap_year.py

@@ -0,0 +1,19 @@
+"""
+https://en.wikipedia.org/wiki/Leap_year
+"""
+
+
+def is_leap_year(year: int) -> bool:
+    """
+    >>> all(is_leap_year(year) for year in [1600, 2000, 24000])
+    True
+    >>> all(is_leap_year(year) for year in [1999, 2001, 2002])
+    False
+    """
+    return year % 4 == 0 and year % 100 != 0 or year % 400 == 0
+
+
+if __name__ == "__main__":
+    from doctest import testmod
+
+    testmod()