Python | Maximize Column in Records List

Python | Maximize Column in Records List

Let's delve into a brief tutorial on maximizing a column in a list of records.

Problem Statement:

Given a list of records where each record is a list of numbers, maximize one of its columns by replacing each value in that column with the maximum value from the same column.

Example:

Input: records = [[5, 2, 8], [1, 4, 2], [7, 8, 3]] column_index = 1 Output: [[5, 8, 8], [1, 8, 2], [7, 8, 3]]

Step-by-Step Solution:

  1. Find the Maximum Value of the Given Column: We'll iterate over the records and find the maximum value for the specified column.

  2. Replace Every Value in that Column: After identifying the maximum value, we'll replace every value in the specified column with this maximum value.

Here's how to do this:

def maximize_column(records, column_index): # Step 1: Find the maximum value of the given column max_value = max(record[column_index] for record in records) # Step 2: Replace every value in that column with the maximum value for record in records: record[column_index] = max_value return records # Test records = [[5, 2, 8], [1, 4, 2], [7, 8, 3]] column_index = 1 print(maximize_column(records, column_index)) # Expected Output: [[5, 8, 8], [1, 8, 2], [7, 8, 3]]

Explanation:

Given the records [[5, 2, 8], [1, 4, 2], [7, 8, 3]] and the column index 1:

  1. We first identify the maximum value in column index 1, which is 8.
  2. Then, we replace every entry in column index 1 with the value 8.
  3. This results in the updated records [[5, 8, 8], [1, 8, 2], [7, 8, 3]].

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