tuple.md

Tuples

• Tuples are immutable sequences of values.
• Once created, the elements of a tuple cannot be modified.

tup = (87, 32, 22, 77, 22)
print(tup)       # Output: (87, 32, 22, 77, 22)
print(tup[1])    # Output: 32

• Empty Tuple: An empty tuple is defined as:

tup = ()
print(tup)       # Output: ()
print(type(tup)) # Output: <class 'tuple'>

• Single Element Tuple: A comma is required to define a single-element tuple.

tup = (1,)
print(tup)       # Output: (1,)

If the comma is omitted, it will not be a tuple:

tup = (1)
print(tup)       # Output: 1 (integer)

• Tuple Slicing: Slicing works similarly to lists.

tup = (1, 2, 3, 4)
print(tup[1:3])  # Output: (2, 3)
print(tup[:3])   # Output: (1, 2, 3)
print(tup[:])    # Output: (1, 2, 3, 4)

• Tuple Methods:
  • index(value): Returns the index of the first occurrence of the value.
  • count(value): Returns the count of the specified value in the tuple.

tup = (2, 1, 3, 1)
print(tup.index(1))  # Output: 1
print(tup.count(2))  # Output: 1

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Working with Lists

1. Store Favorite Movies:
   • Using append():

movies = []
movies.append(input("Enter your favorite movie 1: "))
movies.append(input("Enter your favorite movie 2: "))
movies.append(input("Enter your favorite movie 3: "))
print(movies)

• Direct Input:

movies = [
    input("Enter your favorite movie 1: "),
    input("Enter your favorite movie 2: "),
    input("Enter your favorite movie 3: ")
]
print(movies)

2. Check for Palindrome in a List:
   • A palindrome is a sequence that reads the same forward and backward.

palindrome = [1, 2, 3, 4, 3, 2, 1]
palindrome_copy = palindrome.copy()
palindrome_copy.reverse()

if palindrome == palindrome_copy:
    print("Palindrome")
else:
    print("Not a palindrome")

3. Count "A" Grades in a Tuple:
   • Use the count() method to count occurrences of a value.

grades = ("c", "d", "A", "a", "b", "b", "a")
print(grades.count("a"))  # Output: 3

4. Sort a List:
   • Convert a tuple to a list, then sort it alphabetically.

grades = ["c", "d", "a", "a", "b", "b", "a"]
grades.sort()
print(grades)  # Output: ['a', 'a', 'a', 'b', 'b', 'c', 'd']

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