PyClassLinSearch, Python 3

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#python 3.6.9
#PyClassLinSearch: example linear search using a class in Python
#this code is created by Rezaul Hoque on April 18,2022;
#contact: jewelmrh@yahoo.com; Dhaka,   Bangladesh,https://rezaulhoque.wordpress.com;https:hoquestake.blogspot.com
#note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;
class Search:
  def __init__(self):
                self.thelist=[ ]
  def add(self,element):
                self.thelist.append(element)
         
  def linsearch(self,thelist,item):
       sz=len(self.thelist)
       
       for s in range(sz):
            if self.thelist[s]==item:
                                 return s
                                 
       return -1

def display(self):
           print(self.thelist)

k=Search()
c=Search()
k.add(1)
k.add(2)
k.add(3)
c.add('A')
c.add('Z')
c.add('Y')
k.display()
c.display()
item=int(input("Enter item you look for:\n"))
a=k.linsearch(k,item)

if(a==-1):
              print("item is not found")
else:
              print("item is found at",a)

item2=(input("Enter character you look for:\n"))
str=c.linsearch(c,item2)
if(str==-1):
              print("item is not found")
else:
              print("item is found at",str)

[ - ] Show input
Absolute running time: 0.2 sec, cpu time: 0.06 sec, memory peak: 8 Mb, absolute service time: 0,26 sec