The task is to write a Python Program to sort a list of tuples in increasing order by the last element in each tuple.

Input:[(1, 3), (3, 2), (2, 1)]Output:[(2, 1), (3, 2), (1, 3)]Explanation:sort tuple based on the last digit of each tuple.

**Methods #1: **Using sorted().

Sorted() method sorts a list and always returns a list with the elements in a sorted manner, without modifying the original sequence.

**Approach:**

- Take a list of tuples from the user.
- Define a function that returns the last element of each tuple in the list of tuples.
- Define another function with the previous function as the key and sort the list.
- Print the sorted list.

## Python3

`def` `last(n):` ` ` `return` `n[` `-` `1` `] ` ` ` `def` `sort(tuples):` ` ` `return` `sorted` `(tuples, key` `=` `last)` ` ` `a` `=` `[(` `1` `, ` `3` `), (` `3` `, ` `2` `), (` `2` `, ` `1` `)]` `print` `(` `"Sorted:"` `)` `print` `(sort(a))` |

**Output:**

Sorted: [(2, 1), (3, 2), (1, 3)]

**Methods #2: **Using Bubble Sort.

Access the last element of each tuple using the nested loops. This performs the in-place method of sorting. The time complexity is similar to the Bubble Sort i.e. O(n^2).

## Python3

`# Python program to sort ` `# a list of tuples by the second Item ` ` ` `# Function to sort the list ` `# of tuples by its second item ` `def` `Sort_Tuple(tup): ` ` ` ` ` `# getting length of list of tuples ` ` ` `lst ` `=` `len` `(tup) ` ` ` `for` `i ` `in` `range` `(` `0` `, lst): ` ` ` ` ` `for` `j ` `in` `range` `(` `0` `, lst` `-` `i` `-` `1` `): ` ` ` `if` `(tup[j][` `-` `1` `] > tup[j ` `+` `1` `][` `-` `1` `]): ` ` ` `temp ` `=` `tup[j] ` ` ` `tup[j]` `=` `tup[j ` `+` `1` `] ` ` ` `tup[j ` `+` `1` `]` `=` `temp ` ` ` `return` `tup ` ` ` `# Driver Code ` `tup ` `=` `[(` `1` `, ` `3` `), (` `3` `, ` `2` `), (` `2` `, ` `1` `)]` ` ` `print` `(Sort_Tuple(tup))` |

**Output:**

[(2, 1), (3, 2), (1, 3)]

**Methods #3:** Using sort().

The sort() method sorts the elements of a given list in a specific ascending or descending order.

## Python3

`# Python program to sort a list of ` `# tuples by the second Item using sort() ` ` ` `# Function to sort hte list by second item of tuple ` `def` `Sort_Tuple(tup): ` ` ` ` ` `# reverse = None (Sorts in Ascending order) ` ` ` `# key is set to sort using second element of ` ` ` `# sublist lambda has been used ` ` ` `tup.sort(key ` `=` `lambda` `x: x[` `-` `1` `]) ` ` ` `return` `tup ` ` ` `# Driver Code ` `tup ` `=` `[(` `1` `, ` `3` `), (` `3` `, ` `2` `), (` `2` `, ` `1` `)]` ` ` `# printing the sorted list of tuples ` `print` `(Sort_Tuple(tup)) ` |

**Output:**

[(2, 1), (3, 2), (1, 3)]

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