Python - Slice till K dictionary value lists

Python - Slice till K dictionary value lists

In this tutorial, we will see how to slice dictionary value lists up to a specific index, K.

Scenario:

Imagine we have a dictionary where each key is associated with a list as its value, like this:

data = { 'a': [1, 2, 3, 4, 5], 'b': [5, 6, 7, 8], 'c': [9, 10, 11, 12, 13, 14] }

Our objective is to slice each list in the dictionary up to index K. For instance, if K = 3, our result should be:

{ 'a': [1, 2, 3], 'b': [5, 6, 7], 'c': [9, 10, 11] }

Steps:

  1. Iterate over the dictionary keys.
  2. For each key, slice the corresponding list up to index K.
  3. Update the dictionary value for that key with the sliced list.

Code:

Now, let's translate these steps into Python code:

def slice_dict_values(data, K): # Iterate through dictionary keys and update each list by slicing up to K for key in data: data[key] = data[key][:K] return data # Test data = { 'a': [1, 2, 3, 4, 5], 'b': [5, 6, 7, 8], 'c': [9, 10, 11, 12, 13, 14] } K = 3 print(slice_dict_values(data, K))

This will output:

{ 'a': [1, 2, 3], 'b': [5, 6, 7], 'c': [9, 10, 11] }

Summary:

In this tutorial, we learned how to slice dictionary value lists up to a specific index, K. We achieved this by iterating through the dictionary and updating each list using Python's list slicing mechanism. The result is a dictionary with its value lists sliced up to the desired index.

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