Question

Implement a variation of a list type in Python, specifically a type

IncreasingList that acts as an increasing list of elements. It must implement the following 3 methods:
-append(self, val): First, it removes all elements from the list that have greater values than val, starting from the last one. Once there are no greater elements in the list, it appends val to the end of the list.
-pop(self): It removes the last element from the list if the list is not empty; otherwise, it does nothing.
-len__(self): returns the number of elements in the list.Additional methods may be implemented as necessary. Notice that at any moment, by the definition of append and pop operations, the elements in the list are guaranteed to be sorted in non-decreasing order. The implementations of the 3 required methods will be tested by a provided code stub on several input files. Each input file contains several operations, each one of the types below. Values returned by size operations are printed to the standard output by the provided code stub.
-append val: calls append(val) on the Increasing List instance pop:
-calls pop() on the Increasing List instance
-size: calls len(obj), where obj is an instance of Increasing List, and prints the returned value to the standard outputWe need to perform task for Python Increasing List, when tried coding for it but not able to success on it getting error , code and error are written as below
In this respect we written code as, which is not working hence need help for it
#!/bin/python3
import math
import os
import random
import re
import sys
class IncreasingList:
def append(self, val):
"""
first, it removes all elements from the list that have greater values than val, starting from the last one, and once there are no greater element in the list, it appends val to the end of the list
"""
def append(self, val):
list: lst = []
for x in range(len(self)):
if x != val:
(self[x])
print(*lst)
pass
def pop(self):
"""
removes the last element from the list if the list is not empty, otherwise, if the list is empty, it does nothing
"""
if len(self) == 0:
return 0
else:
return 1
pass
def __len__(self):
"""
returns the number of elements in the list
"""
return 0
if __name__ == '__main__':
fptr = open(os.environ['OUTPUT_PATH'], 'w')
lst = IncreasingList()
q = int(input())
for _ in range(q):
op = input().split()
op_name = op[0]
if op_name == "append":
val = int(op[1])
(val)
elif op_name == "pop":
()
elif op_name == "size":
("%dn" % len(lst))
else:
raise ValueError("invalid operation")
()

Answer 1

The IncreasingList class in Python is created to maintain an ordered list. It provides an implemented 'append' method to add elements in increasing order, 'pop' to remove the last element, and '__len__' to return

Step-by-step explanation:

Your Python code for the IncreasingList class needs to maintain an ordered list, where each new appended element either maintains or increases the order. Here is the corrected version of the IncreasingList class with the necessary methods implemented:

class IncreasingList:
def __init__(self):
self._list = []

def append(self, val):
while self._list and self._list[-1] > val:
self._list.pop()
self._list.append(val)

def pop(self):
if self._list:
self._list.pop()

def __len__(self):
return len(self._list)

The append method removes all elements greater than the value to be appended, starting from the last one. The pop method removes the last element from the list if not empty. The __len__ method simply returns the current number of elements in the list.