Checkpoint initial implementation

tungston/core/season.py

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+# Class ############################################################################################
+
+class Season:
+    """
+    A time of year demonstrating different climate and activity among flora and fauna.
+    """
+
+    def __init__(self, name):
+        self.name = name
+
+    def __str__(self) -> str:
+        return self.name
+
+    def __repr__(self) -> str:
+        return f"Season<{self.name}>"
+
+
+# Constants ########################################################################################
+
+SPRING = Season("spring")
+SUMMER = Season("summer")
+AUTUMN = Season("autumn")
+WINTER = Season("winter")
+
+ALL = [SPRING, SUMMER, AUTUMN, WINTER]
+
+WET = [WINTER, SPRING]
+DRY = [SUMMER, AUTUMN]
+
+HOT  = [SUMMER]
+COOL = [SPRING, AUTUMN]
+COLD = [WINTER]
+
+
+# Constants ########################################################################################
+
+def excluding(target:Season) -> list[Season]:
+    result = []
+
+    for season in ALL:
+        if season == target: continue
+        result.append(season)
+
+    return result