Implement RemoveLastCommand's execute() method to remove source_list's last element.Step 4: Implement GroceryList's execute_undo() methodImplement GroceryList's execute_undo() method to do the following:Pop an UndoCommand off the undo stack• Execute the popped undo commandFile main.py has code that reads in a list of commands, one per line, that allow for basic testing of basic operations. So after implementingexecute_undo(), run your program with the following input:add bananasadd grapesadd strawberriesprintundoprintundoprintquitVerify that the corresponding output is:0. bananas1. grapes2. strawberries0. bananas1. grapes0. bananasThe program's output does not affect grading, so additional test cases can be added, if desired.Submitting code written so far to obtain partial credit is recommended before proceeding to the next step.Step 5: Implement the SwapCommand class and GroceryList's swap_with_undo() method Emport sysfrom GroceryList import GroceryListdef main():grocery_listifquitFalsewhile not quit:command=input()# Process user inputif command"print":elif 0 ==elif 0elif 0=grocery_list.print_list(sys.stdout)command.find("add "):grocery_list.add_with_undo (command [4:])command.find("removeat "):else:=grocery_list.remove_at_with_undo(int(command [9:]))parse_indices (command [5:])index2)nameelse:GroceryList()index1, index2else:grocery_list.swap_with_undo(index1,==if index2 < 0:print(""swap" command requires two indices, separated by a space. ex: swap 25')grocery_list. swap_with_undo(index1, index2)elif commandif 0else:command.find("swap "):1==elif commandquitgrocery_list.get_undo_stack_size():print("Cannot execute undo because undo stack is empty")=grocery_list.execute_undo()"quit":def parse_indices(str):"undo":Trueprint("unknown command: ", command)indices = [int(n) for n in str.split()]if len(indices) != 2:return -1, -1return indices_main__':

Class Definitions:Define the UndoAdd class with an execute method to undo adding an item.Define the…

Step 4: Implement GroceryList's execute_undo() method Implement GroceryList's execute_undo() method to do the following: • Pop an UndoCommand off the undo stack • Execute the popped undo command File main.py has code that reads in a list of commands, one per line, that allow for basic testing of basic operations. So after implementing execute_undo(), run your program with the following input: add bananas add grapes add strawberries print undo print undo print quit Verify that the corresponding output is: 0. bananas 1. grapes 2. strawberries 0. bananas 1. grapes 0. bananas The program's output does not affect grading, so additional test cases can be added, if desired. Submitting code written so far to obtain partial credit is recommended before proceeding to the next step. Step 5: Implement the SwanCommand class and Groceryl ist's swan with unde method

Step 4: Implement GroceryList's execute_undo() method Implement GroceryList's execute_undo() method to do the following: • Pop an UndoCommand off the undo stack • Execute the popped undo command File main.py has code that reads in a list of commands, one per line, that allow for basic testing of basic operations. So after implementing execute_undo(), run your program with the following input: add bananas add grapes add strawberries print undo print undo print quit Verify that the corresponding output is: 0. bananas 1. grapes 2. strawberries 0. bananas 1. grapes 0. bananas The program's output does not affect grading, so additional test cases can be added, if desired. Submitting code written so far to obtain partial credit is recommended before proceeding to the next step. Step 5: Implement the SwanCommand class and Groceryl ist's swan with unde method

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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A: Answer is given below-

Question

Implement RemoveLastCommand's execute() method to remove source_list's last element.
Step 4: Implement GroceryList's execute_undo() method
Implement GroceryList's execute_undo() method to do the following:
Pop an UndoCommand off the undo stack
• Execute the popped undo command
File main.py has code that reads in a list of commands, one per line, that allow for basic testing of basic operations. So after implementing
execute_undo(), run your program with the following input:
add bananas
add grapes
add strawberries
print
undo
print
undo
print
quit
Verify that the corresponding output is:
0. bananas
1. grapes
2. strawberries
0. bananas
1. grapes
0. bananas
The program's output does not affect grading, so additional test cases can be added, if desired.
Submitting code written so far to obtain partial credit is recommended before proceeding to the next step.
Step 5: Implement the SwapCommand class and GroceryList's swap_with_undo() method

Emport sys
from GroceryList import GroceryList
def main():
grocery_list
if
quit
False
while not quit:
command
=
input()
# Process user input
if command
"print":
elif 0 ==
elif 0
elif 0
=
grocery_list.print_list(sys.stdout)
command.find("add "):
grocery_list.add_with_undo (command [4:])
command.find("removeat "):
else:
=
grocery_list.remove_at_with_undo(int(command [9:]))
parse_indices (command [5:])
index2)
name
else:
GroceryList()
index1, index2
else:
grocery_list.swap_with_undo(index1,
==
if index2 < 0:
print(""swap" command requires two indices, separated by a space. ex: swap 25')
grocery_list. swap_with_undo(index1, index2)
elif command
if 0
else:
command.find("swap "):
1
==
elif command
quit
grocery_list.get_undo_stack_size():
print("Cannot execute undo because undo stack is empty")
=
grocery_list.execute_undo()
"quit":
def parse_indices(str):
"undo":
True
print("unknown command: ", command)
indices = [int(n) for n in str.split()]
if len(indices) != 2:
return -1, -1
return indices
_main__':

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