list operations

Draw-Patten-Using-Loop/pattern.py

@@ -0,0 +1,7 @@
+N = int(input('enter number'))
+number = N+1
+for _ in range(N):
+    print()
+    number=number-1
+    for i  in reversed(range(1,N+1)):     
+        print(str(i)*number,end="")

List-Operation/ChiragPatil/stackUsingList.py

@@ -0,0 +1,52 @@
+class st:
+    def __init__(self):
+        self.stack = []
+
+    def push(self,item):
+        self.stack.insert(len(self.stack),item)
+
+    def pop(self):
+        if len(self.stack)==0:
+            print('Stack is empty')
+        else:
+            print(self.stack[-1])
+            self.stack.remove(self.stack[-1])
+
+
+    def peek(self):
+        if len(self.stack)!=0:
+            print(self.stack[-1])
+
+    def isEmpty(self):
+        if len(self.stack)!=0:
+            return False
+        else:
+            return True
+
+    def display(self):
+        print(self.stack)
+
+s = st() 
+
+while True:
+    print('\npush <value>')
+
+    print('pop')
+    print('quit')
+    print('display')
+    print('peek')
+    do = input('What would you like to do? ').split()
+
+    operation = do[0].strip().lower()
+    if operation == 'push':
+        s.push(int(do[1]))
+    elif operation == 'pop':
+         s.pop()
+    elif operation == 'display':
+        s.display()
+    elif operation == 'isEmpty':
+        s.isEmpty()
+    elif operation == 'peek':
+        s.peek()
+    elif operation == 'quit':
+        break