School Commit Init

Anul 1/Semestrul 2/Data structures/Seminar 1/Bag.py

@@ -0,0 +1,39 @@
+class Bag:
+    def __init__(self):
+        self.__elements = []
+    def add(self, e):
+        self.__elements.append(e)
+    def remove(self, e):
+        if e in self.__elements:
+            self.__elements.remove(e)
+            return True
+        return False
+    def search(self, e):
+        return e in self.__elements
+    def size(self):
+        return len(self.__elements)
+    def nrOccurrences(self, e):
+        return self.__elements.count(e)
+    def destroy(self):
+        del(self)
+    def iterator(self):
+        return BagIterator(self.__elements)
+
+
+class BagIterator:
+    def __init__(self, elements):
+        self.__elements = elements
+        self.__current = 0
+    def first(self):
+        self.__current = 0
+    def valid(self):
+        return self.__current < len(self.__elements)
+    def next(self):
+        if self.valid():
+            self.__current += 1
+    def getCurrent(self):
+        if self.valid():
+            return self.__elements[self.__current]
+        else:
+            raise ValueError("Invalid iterator position.")
+