Page 22 - PYTHON-12

(I) push_complaint(ComplaintStack, complaint): This function takes the Stack ‘ComplaintStack’ and a
new complaint record ‘complaint’ as arguments and pushes the new complaint record onto the
Stack.
(II) pop_complaint(ComplaintStack): This function pops the topmost complaint record from the Stack
and returns it. If the stack is empty, the function should display ‘Underflow’.
(III) peep(ComplaintStack): This function displays the topmost element of the Stack without deleting it.
If the Stack is empty, the function should display ‘None’.
OR
(B) Write the definition of the user-defined function ‘Push_upper(strings)’ that takes a list of strings and
pushes only the uppercase versions of each string onto a Stack named UpperStack.
Write ‘Pop_upper()’ function to pop and return the topmost uppercase string from UpperStack. If the
Stack is empty, it should display ‘Stack is empty.’ (3)
Write ‘Show_all_upper()’ function to display all uppercase strings in UpperStack without removing them.
If the Stack is empty, display ‘No uppercase strings available.’
Ans. (A) (I) def push_complaint(ComplaintStack, complaint):

ComplaintStack.append(complaint)
print("Complaint added successfully.")
(II) def pop_complaint(ComplaintStack):

if len(ComplaintStack) == 0:
print("Underflow")
return None

else:
return ComplaintStack.pop()
(III) def peep(ComplaintStack):

if len(ComplaintStack) == 0:
print("None")
else:
print("Topmost complaint:", ComplaintStack[-1])
OR
(B) UpperStack = []

def Push_upper(strings):
for string in strings:
UpperStack.append(string.upper())
print("Uppercase strings pushed to Stack.")
def Pop_upper():
if len(UpperStack) == 0:
print("Stack is empty.")
return None
else:
return UpperStack.pop()
def Show_all_upper():
if len(UpperStack) == 0:

A.8 Computer Science–XII