Changing a Tuple
* Unlike lists, tuples are immutable.
* This means that elements of a tuple cannot be changed once it has been assigned.
* But, if the element is itself a mutable data type like list, its nested items can be changed.
* We can also assign a tuple to different values (reassignment).
n=(0,1,2,3,4,5,6,7,8,9,10)
print(n)
#(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
n[1]=10
#error will get generated as tuple elements cannot be changed
print(n)
#but list within a tuple can be changed
n = (4, 2, 3, [6, 5])
print(n)
n[3][0]=10
print(n)
n[3][1]=100
print(n)
Output:
(4, 2, 3, [6, 5])
(4, 2, 3, [10, 5])
(4, 2, 3, [10, 100])
Concatenation and Repeat
* We can use + operator to combine two tuples. This is also called concatenation.
* We can also repeat the elements in a tuple for a given number of times using the * operator.
* Both + and * operations result into a new tuple.
Concatenation
Example:
# Concatenation
print((1, 2, 3) + (4, 5, 6))
Output:
(1, 2, 3, 4, 5, 6)
Example:
n1=(1,2,3,4,5)
print(n1)
n2=(6,7,8,9,10)
print(n2)
print(n1+n2)
Output:
#(1, 2, 3, 4, 5)
#(6, 7, 8, 9, 10)
#(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
Repeat
print((“Repeat”,) * 3)
# Output: (‘Repeat’, ‘Repeat’, ‘Repeat’)
n=(“hello”,)
print(n)
print(n*3)
print(n*5)
output:
(‘hello’,)
(‘hello’, ‘hello’, ‘hello’)
(‘hello’, ‘hello’, ‘hello’, ‘hello’, ‘hello’)
Deleting a Tuple
* As discussed above, we cannot change the elements in a tuple. That also means we cannot delete or remove items from a tuple.
* But deleting a tuple entirely is possible using the keyword del.
n=(1,2,3,4,5)
print(n)
del n[1]
#error : TypeError: ‘tuple’ object doesn’t support item deletion
print(n)
#But we can delete entire tuple
n=(1,2,3,4,5)
print(n)
del n
# NameError: name ‘n’ is not defined
File “C:/Python37/tup3.py”, line 4, in <module>
print(n)
NameError: name ‘n’ is not defined
print(n)
The tuple() Constructor
* It is also possible to use the tuple() constructor to make a tuple.
Example:
Using the tuple() method to make a tuple:
n=tuple((“amit”,”sumit”,”kapil”))
# note the double round-brackets
print(n)
Output:
(‘amit’, ‘sumit’, ‘kapil’)
>>>
n = tuple((“apple”, “banana”, “cherry”))
# note the double round-brackets
print(n)
Output:
(‘apple’, ‘banana’, ‘cherry’)
>>>
