🔒 Tuples¶

1. Definition and Initialization¶

In Python, a tuple is an ordered, immutable collection of items, enclosed in parentheses.

In [2]:

# tuple of integers
t1 = (1, 2, 3, 4, 5)
print(t1)  # prints: (1, 2, 3, 4, 5)

# tuple of strings
t2 = ('apple', 'banana', 'cherry')
print(t2)  # prints: ('apple', 'banana', 'cherry')

# mixed tuple
t3 = (1, 'apple', True, 3.14, (1, 2, 3))
print(t3)  # prints: (1, 'apple', True, 3.14, (1, 2, 3))

# tuple of integers t1 = (1, 2, 3, 4, 5) print(t1) # prints: (1, 2, 3, 4, 5) # tuple of strings t2 = ('apple', 'banana', 'cherry') print(t2) # prints: ('apple', 'banana', 'cherry') # mixed tuple t3 = (1, 'apple', True, 3.14, (1, 2, 3)) print(t3) # prints: (1, 'apple', True, 3.14, (1, 2, 3))

(1, 2, 3, 4, 5)
('apple', 'banana', 'cherry')
(1, 'apple', True, 3.14, (1, 2, 3))

2. Accessing Tuple Items¶

You can access tuple items by referring to their index number. Python uses 0-based indexing.

In [3]:

t1 = (1, 2, 3, 4, 5)
print(t1[0])  # prints: 1
print(t1[2])  # prints: 3

# Negative indexing starts from the end.
print(t1[-1])  # prints: 5

t1 = (1, 2, 3, 4, 5) print(t1[0]) # prints: 1 print(t1[2]) # prints: 3 # Negative indexing starts from the end. print(t1[-1]) # prints: 5

1
3
5

3. Tuple Immutability¶

Unlike lists, tuples are immutable. This means you can't change, add, or remove items after the tuple is created.

In [4]:

t1 = (1, 2, 3, 4, 5)
t1[0] = 10  # raises TypeError: 'tuple' object does not support item assignment

t1 = (1, 2, 3, 4, 5) t1[0] = 10 # raises TypeError: 'tuple' object does not support item assignment

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
Cell In[4], line 2
      1 t1 = (1, 2, 3, 4, 5)
----> 2 t1[0] = 10  # raises TypeError: 'tuple' object does not support item assignment

TypeError: 'tuple' object does not support item assignment

4. Tuple Slicing¶

You can extract a part of a tuple using slicing. The syntax is tuple[start:stop:step].

In [ ]:

t1 = (1, 2, 3, 4, 5)
print(t1[1:4])  # prints: (2, 3, 4)
print(t1[:3])   # prints: (1, 2, 3)
print(t1[::2])  # prints: (1, 3, 5)

t1 = (1, 2, 3, 4, 5) print(t1[1:4]) # prints: (2, 3, 4) print(t1[:3]) # prints: (1, 2, 3) print(t1[::2]) # prints: (1, 3, 5)

5. Tuple Methods¶

Python provides two built-in methods for tuples: count() and index().

In [ ]:

t1 = (1, 2, 2, 3, 4, 4, 4, 5)

# counts the number of occurrences of 2
print(t1.count(2))  # prints: 2

# returns the first index of 4
print(t1.index(4))  # prints: 4

t1 = (1, 2, 2, 3, 4, 4, 4, 5) # counts the number of occurrences of 2 print(t1.count(2)) # prints: 2 # returns the first index of 4 print(t1.index(4)) # prints: 4

6. Length of a Tuple¶

You can get the number of items in a tuple with the len() function.

In [ ]:

t1 = (1, 2, 3, 4, 5)
print(len(t1))  # prints: 5

t1 = (1, 2, 3, 4, 5) print(len(t1)) # prints: 5

7. Tuple Unpacking¶

Tuple unpacking allows you to assign each item in an iterable (often a tuple) to a variable.

In [ ]:

t1 = (1, 2, 3, 4, 5)
a, b, c, d, e = t1
print(a)  # prints: 1
print(b)  # prints: 2
print(c)  # prints: 3

t1 = (1, 2, 3, 4, 5) a, b, c, d, e = t1 print(a) # prints: 1 print(b) # prints: 2 print(c) # prints: 3