Python | Count tuples occurrence in list of tuples

Many a time while developing web and desktop products in Python, we use nested lists and have several queries about how to find the count of unique tuples. Let us see how to get the count of unique tuples in the given list of tuples. Below are some ways to achieve the above task.

Method #1: Using Iteration 

Python3

# Python code to count unique
# tuples in list of list

import collections
Output = collections.defaultdict(int)

# List initialization
Input = [[('hi', 'bye')], [('Geeks', 'forGeeks')],
         [('a', 'b')], [('hi', 'bye')], [('a', 'b')]]

# Using iteration
for elem in Input:
      Output[elem[0]] += 1

# Printing output
print(Output)

Output:

defaultdict(<class 'int'>, {('Geeks', 'forGeeks'): 1, ('hi', 'bye'): 2, ('a', 'b'): 2})

Method #2: Using chain and Counter

Python3

# Python code to count unique
# tuples in list of list

# Importing
from collections import Counter
from itertools import chain

# List initialization
Input = [[('hi', 'bye')], [('Geeks', 'forGeeks')],
         [('a', 'b')], [('hi', 'bye')], [('a', 'b')]]

# Using counter and chain
Output = Counter(chain(*Input))

# Printing output
print(Output)

Output:

Counter({('hi', 'bye'): 2, ('a', 'b'): 2, ('Geeks', 'forGeeks'): 1})

Method #3: List Comprehension method

Python3

Input = [('hi', 'bye'),('Geeks', 'forGeeks'),('a', 'b'),('hi', 'bye'),('a', 'b')]
check_ele=('a', 'b')
x=[i for i in Input if i==check_ele]
print("tuple ('a', 'b') occures",len(x),"times")

Output

tuple ('a', 'b') occures 2 times

Method #4: Using enumerate function

Python3

Input = [('hi', 'bye'),('Geeks', 'forGeeks'),('a', 'b'),('hi', 'bye'),('a', 'b')]
check_ele=('a', 'b')
x=[i for a,i in enumerate(Input) if i==check_ele]
print("tuple ('a', 'b') occures",len(x),"times")

Output

tuple ('a', 'b') occures 2 times

Method #5: Using lambda function 

Python3

Input = [('hi', 'bye'),('Geeks', 'forGeeks'),('a', 'b'),('hi', 'bye'),('a', 'b')]
check_ele=('a', 'b')
x=list(filter(lambda i:(i==check_ele),Input))
print("tuple ('a', 'b') occures",len(x),"times")

Output

tuple ('a', 'b') occures 2 times

Method #6: Using only Counter function 

Python3

from collections import Counter
Input = [('hi', 'bye'),('Geeks', 'forGeeks'),('a', 'b'),('hi', 'bye'),('a', 'b')]
check_ele=('a', 'b')
x=Counter(Input)
print("tuple ('a', 'b') occures",x[check_ele],"times")

Output

tuple ('a', 'b') occures 2 times

Method #7: Using countof function

Python3

import operator as op
Input = [('hi', 'bye'),('Geeks', 'forGeeks'),('a', 'b'),('hi', 'bye'),('a', 'b')]
check_ele=('a', 'b')
print(op.countOf(Input,check_ele))

Output

2