﻿ Python: Frequency of the elements in a given list of lists - w3resource

# Python: Frequency of the elements in a given list of lists

## Python List: Exercise - 143 with Solution

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

Sample Solution:

Python Code:

``````# Define a function 'count_elements_lists' that counts the frequency of elements in a list of lists
def count_elements_lists(nums):
# Flatten the list of lists into a single list using a list comprehension
nums = [item for sublist in nums for item in sublist]

# Initialize an empty dictionary 'dic_data' to store element frequencies
dic_data = {}

# Iterate through the flattened list 'nums'
for num in nums:
# Check if the element 'num' is already in the dictionary
if num in dic_data.keys():
# If yes, increment the frequency count
dic_data[num] += 1
else:
# If not, create a new entry in the dictionary with key 'num' and initial value 1
key = num
value = 1
dic_data[key] = value

# Return the dictionary containing element frequencies
return dic_data

# Create a list of lists 'nums' representing a 2D matrix
nums = [
[1, 2, 3, 2],
[4, 5, 6, 2],
[7, 8, 9, 5],
]

# Print a message indicating the original list of lists
print("Original list of lists:")
# Print the contents of 'nums'
print(nums)

# Print a message indicating the operation to count the elements' frequencies
print("\nFrequency of the elements in the said list of lists:")
# Call the 'count_elements_lists' function with 'nums' and print the result
print(count_elements_lists(nums))
```
```

Sample Output:

```Original list of lists:
[[1, 2, 3, 2], [4, 5, 6, 2], [7, 8, 9, 5]]

Frequency of the elements in the said list of lists:
{1: 1, 2: 3, 3: 1, 4: 1, 5: 2, 6: 1, 7: 1, 8: 1, 9: 1}
```

Flowchart:

Python Code Editor:

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