Change language

# Python | Program for counting duplicates in a list of tuples

| |

Examples :

Input: [(’a’, ’e’), (’b’, ’x’ ), (’b’, ’x’), (’a’, ’e’), (’b’, ’x’)]
Output:
( ’a’, ’e’) - 2
(’b’, ’x’) - 3

Input: [(0, 5), (6 , 9), (0, 8)]
Output: No Duplicates

Let’s see how we can count the duplicates in a list of tuples.

Approach # 1: The Naive Approach

This approach uses two loops to iterate over the elements of the list and check if the first and second element of each element matches any other tuple.

` `

` Exit : Test Case 1: (’a’,’ e’) - 2 (’b’,’ x’) - 3 Test Case 2: No Duplicates Time complexity — O (n) 2 Approach # 2. Using the counter Counter — it is a container included in the collections module. It is an unordered collection that stores elements and their corresponding counts as a dictionary. # Python3 code to convert the tuple # to string def count (listOfTuple):     flag = False   # Add duplicate elements to list coll_list = []  coll_cnt = 0 for t in listOfTuple:   # To check if there is duplicate if t in coll_list:    flag = True continue   else : coll_cnt = 0 for b in listOfTuple: if b [ 0 ] = = t [ 0 ] and b [ 1 ] = = t [ 1 ]: coll_cnt = coll_cnt + 1   # Print quantity if duplicate element exists if (coll_cnt"  1 ):    print (t, "-" , coll_cnt)   coll_list.append (t)   if flag = = False : print ( "No Duplicates" )   # Driver code print ( "Test Cas e 1: " ) listOfTuple = [( ’a’ , ’e’ ), ( ’ b’ , ’x’ ), ( ’ b’ , ’x’ ),  ( ’a’ , ’e’ ), ( ’ b’ , ’x’ )]    count (listOfTuple)   print ( " Test Case 2: " ) listOfTuple = [( 0 , 5 ), ( 6 , 9 ), ( 0 , 8 )] count (listOfTuple) # Python3 code to transform a tuple # to line import collections   def count (listOfTuple):   flag = False val = collections.Counter (listOfTuple) uniqueList = list ( set (listOfTuple))   for i in uniqueList: if val [i ]" = 2 : flag = True print (i, "-" , val [i])     < code class = "keyword"> if flag = = False : print ( "Duplicate doesn’t exist" )   # Driver code listOfTuple = [( ’ a’ , ’e’ ), ( ’b’ , ’ x’ ), ( ’b’ , ’ x’ ),  ( ’a’ , ’ e’ ), ( ’b’ , ’x’ )]  count (listOfTuple) `

` ` Exit:

` (’b’,’ x’ ) - 3 (’a’,’ e’) - 2 `

Time complexity — O (n)

Approach # 3 Using a different dictate

You can create a dictionary, say ` count_map `, and keep the count each tuple as a value.

 ` # Python3 code to convert the tuple ` ` # into a string ` ` def ` ` count (listOfTuple): `   ` count_map ` ` = ` ` {} ` ` for ` ` i ` ` in ` ` listOfTuple: ` ` count_map [i] ` ` = ` count_map.get (i, ` 0 ` `) ` ` + ` ` 1 ` ` print ` ` (count_map) `   ` # Driver code ` ` print ` ` (` ` "Test Case 1: "` `) ` ` listOfTuple ` ` = ` ` [(` ` ’a’ ` `, ` `’ e’ ` `), (` ` ’b’ ` `, ` ` ’x’ ` `), (` `’ b’ ` `, ` ` ’x’ ` `), ` ` ` ` (` ` ’a’ ` `, ` ` ’e’ ` `), (` `’ b’ ` `, ` ` ’x’ ` `)] `   ` count (listOfTuple) `

Exit :

` Test Case 1: {(’a’,’ e’): 2, (’b’,’ x’): 3 } `

Time complexity — O (n)

## Shop

Learn programming in R: courses

\$

Best Python online courses for 2022

\$

Best laptop for Fortnite

\$

Best laptop for Excel

\$

Best laptop for Solidworks

\$

Best laptop for Roblox

\$

Best computer for crypto mining

\$

Best laptop for Sims 4

\$

Latest questions

NUMPYNUMPY

Common xlabel/ylabel for matplotlib subplots

NUMPYNUMPY

How to specify multiple return types using type-hints

NUMPYNUMPY

Why do I get "Pickle - EOFError: Ran out of input" reading an empty file?

NUMPYNUMPY

Flake8: Ignore specific warning for entire file

NUMPYNUMPY

glob exclude pattern

NUMPYNUMPY

How to avoid HTTP error 429 (Too Many Requests) python

NUMPYNUMPY

Python CSV error: line contains NULL byte

NUMPYNUMPY

csv.Error: iterator should return strings, not bytes

## Wiki

Python | How to copy data from one Excel sheet to another

Common xlabel/ylabel for matplotlib subplots

Check if one list is a subset of another in Python

How to specify multiple return types using type-hints

Printing words vertically in Python

Python Extract words from a given string

Cyclic redundancy check in Python

Finding mean, median, mode in Python without libraries