this i do by init

practice.py

+#swap the elements in list, string, tuple, set and dictionary
+# l1 = [2,3,4,5,6,7]
+# l1[0] = l1[3]
+# # print(l1)
+# s = "this is great"
+# # s = s.split()
+# for i in range(3):
+#     for j in range(3):
+#         s[i] = s[j]
+# print(s)
+# s = {3,4,5,6}
+# s = (3,4,5) #in tiple indexing is possible but not in sets
+
+# print(s[1])
+
+#string rotation
+# s = "this"
+# n = int(len(s)/2)
+# print(s[n:]+s[:n])
+# removing digits from string
+# s = "alpha23"
+# s1 = ""
+# l = []
+# for i in s:
+#     if i.isnumeric():
+#         l.append(i)
+#     else:
+#         s1+=i
+# print(s1)
+# example of picking 
+# import pickle
+# with open("piko.txt",'bw') as file:
+#     k = "this is my brain!"
+#     pickle.dump(k,file)
+
+# l = [34,56,12,21,23]
+# for i in range(len(l)):
+#     for j in range(len(l)):
+#         if l[i]>l[j]:
+#             l[i],l[j] = l[j],l[i]
+# print(l)
+# l1 = [4,5,6,7]
+# l2 = [8,9,2,1]
+# l4 = list(zip(l1,l2))
+# print(l4)
+# l3 = [i+j for i,j in zip(l1,l2)]
+# print(l3)
+
+#star pattern
+# for i in range(5):
+#     print(" "*(4-i),"*"*(i*2+1),end = " ")
+#     print()
+# remove duplicacy from string
+# s = "thisismypen"
+# s1 = ""
+# l = ""
+# for i in s:
+#     if i not in l:
+#         l+=i
+#     else:
+#         s1+=i
+
+# print(s1,l)
+
+
+# vowel detection
+# v = "aeiou"
+# w = ""
+# n_w = ""
+# s = "thisisgreat"
+# for i in s:
+#     if i in v:
+#         n_w+=i
+#     else:
+#         w+=i
+# print(w,n_w)
+# odd even characters in a string
+# s = "this is my car"
+# for i in s:
+#     if i == "i":
+#         s=s.replace(i,"new")
+# print(s)
+# replacement in a list
+# l = [3,4,5,6,7]
+# for i in range(len(l)):
+#     if l[i] == 3:
+#         l[i] = 67
+# print(l)
+# detecting the index number of a element
+# l = [5,6,7,8]
+# for i in l:
+#     if i == 7:
+#         print(l.index(i))
+# d = {"saroj":1,"saroj":2}
+# print(d)
+# count particular element in a list
+# l = [3,4,5,6,3,4,5,3,3,33,3]
+# count = 0
+# for i in range(len(l)):
+#     if l[i] == 3:
+#         l[i] = 6789
+# print(l)
+
+#reverse a list
+# l = [4,5,6,7,8,9]
+# for i in range(len(l)):
+#     for j in range(len(l)):
+#         if l[i]>l[j]:
+#             l[i],l[j]=l[j],l[i]
+# print(l)
+# year = int(input("enter the year: "))
+# if (year%4==0 and year%400==0) or year%100 !=0:
+#     print("yes year is leap year")
+# else:
+#     print("year is not leap year")
+# find the index number in a list
+# l = [5,6,7,3,2]
+# def finding_index_number(l,n):
+#     for i in l:
+#         if i == n:
+#             print(l.index(i))
+
+# finding_index_number(l,7)
+#check the number is square or not
+# n = 4
+# import math
+# print(math.isqrt(n))
+#decorators
+# def decorators(function):
+#     def inside_function(string):
+#          function(string.upper())
+#     return inside_function
+# @decorators
+# def apply_dec(string):
+#     print(string[::-1])
+
+# apply_dec("saroj")
+# raising exception
+# try:
+#     a = 3
+#     b = 0
+#     if b == 0:
+#         raise Exception("not divisible")
+# except Exception as e:
+#     print(e)
+# finally:
+#     print("code is fully execited")
+# # odd and even numbers
+# even = [i for i in range(10) if i%2==0]
+# odd = [i for i in range(10) if i%2!=0]
+# print(even)
+# print(odd)
+# x = lambda w : w**2
+# print(x(3))
+# l = [5,6,7,3,1,423,1]
+# min = l[0]
+# max = l[0]
+# for i in range(len(l)):
+#     if l[i]> max:
+#         max = l[i]
+#     if l[i]<min:
+#         min = l[i]
+# print(min,max)
+
+# k = 10
+# l  = [6,4,6,4,8,2,10,0,7,3,11,-1]
+# for i in l:
+#     for j in l:
+#         if l[i]+l[j]==k:
+#             print(l[i],l[j])
+# make a dictionary of two lists
+# l1 = [4,5,6,7]
+# l2 = [8,9,7,6]
+# d = dict(zip(l1,l2))
+# print(d)
+# def factorial(n):
+#     if n<=1:
+#         return 1
+#     else: 
+#         return n*factorial(n-1)
+# print(factorial(5))
+#printing fibbonaci series
+# def febbonaci_series(n):
+#     if n<=1:
+#         return 1
+#     else:
+#         return febbonaci_series(n-1) + febbonaci_series(n-2)
+    
+# for i in range(10):
+#     print(febbonaci_series(i))
+# # genrator
+# def genrator():
+#     for i in range(1,10):
+#         yield i
+
+# g = genrator()
+# print(g.__next__())
+
+# import os
+# l = ["sar","sa"]
+# s = os.path.commonprefix(l)
+# print(s)
+