1+ arr = [1 , 2 , 3 , 4 , 5 ]
2+ 3+ print ("READ" )
4+ # READING FROM AN ARRAY --> O(1)
5+ 6+ index = 3
7+ print (arr [index ])
8+ 9+ print ("------------------------------------------------------------------------------" )
10+ 11+ print ("TRAVERSE" )
12+ # TRAVERSING THROUGH AN ARRAY --> O(n)
13+ 14+ print ("Using For Loop" )
15+ for i in range (len (arr )):
16+ print (arr [i ], end = "->" )
17+ print ()
18+ 19+ print ("Using While Loop" )
20+ index = 0
21+ while index < len (arr ):
22+ print (arr [index ], end = "->" )
23+ index += 1
24+ print ()
25+ 26+ print ("------------------------------------------------------------------------------" )
27+ 28+ print ("DELETE" )
29+ # DELETING FROM AN ARRAY --> O(n)
30+ 31+ print ("From the end of Array --> O(1)" )
32+ print (f"Before Delete: { arr } )
33+ del arr [len (arr )- 1 ]
34+ print (f"After Delete: { arr } )
35+ 36+ arr = [1 , 2 , 3 , 4 , 5 ]
37+ print ("In the middle of Array --> O(n)" )
38+ print (f"Before Delete: { arr } )
39+ index_to_be_deleted = 1
40+ for index in range (index_to_be_deleted , len (arr )- 1 ):
41+ arr [index ] = arr [index + 1 ]
42+ del arr [len (arr )- 1 ]
43+ print (f"After Delete: { arr } )
44+ 45+ print ("------------------------------------------------------------------------------" )
46+ 47+ print ("INSERT" )
48+ # INSERTING IN AN ARRAY --> O(n)
49+ 50+ arr = [1 , 2 , 3 , 4 , 5 ]
51+ print ("Inserting at an end --> O(1)" )
52+ print (f"Before Delete: { arr } )
53+ arr .append (6 )
54+ print (f"After Delete: { arr } )
55+ 56+ arr = [1 , 2 , 3 , 4 , 5 ]
57+ print ("Inserting in the middle --> O(n)" )
58+ index_to_be_inserted_at = 2
59+ element_to_be_inserted = 8
60+ print (f"Before Delete: { arr } )
61+ arr .append ("place_holder_for_new_element" )
62+ for i in range (len (arr )- 1 , index_to_be_inserted_at - 1 , - 1 ):
63+ arr [i ] = arr [i - 1 ]
64+ arr [index_to_be_inserted_at ] = element_to_be_inserted
65+ print (f"After Delete: { arr } )
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