added 4 methods to Statistics class

src/entities/Statistics.py

@@ -1,6 +1,46 @@
 class Statistics:
     def __init__(self):
-        self.hp
-        self.hunger
-        self.thirst
-        self.stamina
+        self.hp = 100
+        self.hunger = 100
+        self.thirst = 100
+        self.stamina = 100
+
+    # methods that don't let the values pass below 0 and over 100 during change
+    def set_hp(self, hp_diff):
+        if 0 <= self.hp + hp_diff <= 100:
+            self.hp = self.hp + hp_diff
+        else:
+            if self.hp + hp_diff <= 0:
+                self.hp = 0
+            else:
+                self.hp = 100
+
+    def set_hunger(self, hunger_diff):
+        if 0 <= self.hp + hunger_diff <= 100:
+            self.hp = self.hp + hunger_diff
+        else:
+            if self.hp + hunger_diff <= 0:
+                self.hp = 0
+            else:
+                self.hp = 100
+
+    def set_thirst(self, thirst_diff):
+        if 0 <= self.hp + thirst_diff <= 100:
+            self.hp = self.hp + thirst_diff
+        else:
+            if self.hp + thirst_diff <= 0:
+                self.hp = 0
+            else:
+                self.hp = 100
+
+    def set_stamina(self, stamina_diff):
+        if 0 <= self.hp + stamina_diff <= 100:
+            self.hp = self.hp + stamina_diff
+        else:
+            if self.hp + stamina_diff <= 0:
+                self.hp = 0
+            else:
+                self.hp = 100
+
+
+