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Author: ivanmmarkovic

Ch03. Basic Data Structures/Stack/stack-fixed-array/Stack.py

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+
+class Stack:
+    def __init__(self, length: int = 10):
+        self.length = length
+        self.stack: list = [None] * self.length
+        self.pointer = -1
+    
+    def isEmpty(self)->bool:
+        return self.pointer == -1
+
+    def size(self)->int:
+        return self.pointer + 1
+
+    def push(self, item):
+        if self.pointer < self.length - 1:
+            self.pointer += 1
+            self.stack[self.pointer] = item
+        else:
+            raise Exception('Stack is full')
+
+    def pop(self):
+        if self.isEmpty():
+            raise Exception('Stack is empty')
+        else:
+            retValue = self.stack[self.pointer]
+            self.pointer -= 1
+            return retValue
+
+    def peek(self):
+        if self.isEmpty():
+            raise Exception('Stack is empty')
+        else:
+            return self.stack[self.pointer]
+