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Python: Frequency of the elements in a given list of lists using collections module

Python Collections: Exercise-29 with Solution

Write a Python program to get the frequency of the elements in a given list of lists. Use collections module.

Sample Solution:

Python Code:

from collections import Counter
from itertools import chain
nums = [
        [1,2,3,2],
        [4,5,6,2],
        [7,1,9,5],
       ]
    
print("Original list of lists:")
print(nums)
print("\nFrequency of the elements in the said list of lists:")
result = Counter(chain.from_iterable(nums))
print(result)

Sample Output:

Original list of lists:
[[1, 2, 3, 2], [4, 5, 6, 2], [7, 1, 9, 5]]

Frequency of the elements in the said list of lists:
Counter({2: 3, 1: 2, 5: 2, 3: 1, 4: 1, 6: 1, 7: 1, 9: 1})

Flowchart:

Python Collections: Frequency of the elements in a given list of lists using collections module.

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Previous: Write a Python program to create a dictionary grouping a sequence of key-value pairs into a dictionary of lists. Use collections module.
Next: Write a Python program to count the occurrence of each element of a given list.

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Python: Tips of the Day

Given a predicate function, fn, and a prop string, this curried function will then take an object to inspect by calling the property and passing it to the predicate:

Example:

def tips_check_prop(fn, prop):
  return lambda obj: fn(obj[prop])
check_age = tips_check_prop(lambda x: x >= 25, 'age')
user = {'name': 'Owen', 'age': 25}

print(check_age(user))

Output:

True