Python | Nested Records Modulo

Python | Nested Records Modulo

In this tutorial, we will be exploring how to modify records in a nested list based on the modulo operation. We'll be working with records in the format of dictionaries.

Problem Statement:

Assume we have a list of dictionaries (records) where each record contains an integer value, and we want to update each record by taking the modulo of that integer value.

Steps:

  1. Define the Record List: Let's start with a list of dictionaries. Each dictionary will have a name field and a value field. The goal is to update the value field using the modulo operation.

  2. Apply Modulo Operation: Traverse through each record and apply the modulo operation to the value field.

1. Using a For Loop:

Let's start with a basic iterative approach:

records = [ {"name": "Alice", "value": 105}, {"name": "Bob", "value": 230}, {"name": "Charlie", "value": 360} ] MODULO = 100 for record in records: record["value"] %= MODULO print(records)

2. Using List Comprehension:

You can also use list comprehension for a more concise approach:

records = [ {"name": "Alice", "value": 105}, {"name": "Bob", "value": 230}, {"name": "Charlie", "value": 360} ] MODULO = 100 records = [{"name": r["name"], "value": r["value"] % MODULO} for r in records] print(records)

Output:

For both methods, the output will be:

[ {'name': 'Alice', 'value': 5}, {'name': 'Bob', 'value': 30}, {'name': 'Charlie', 'value': 60} ]

Conclusion:

Applying the modulo operation to values in nested records is a straightforward task in Python, thanks to its powerful dictionary and list manipulation capabilities. Depending on your use case and personal preference, you can either go with a traditional loop or leverage list comprehensions to achieve the desired result.

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