Write a Python function that checks if a given string contains only numeric digits #pythonprogram

This Python function verifies if a given string contains only numeric digits (0-9). It’s useful in data validation scenarios where you want to ensure that an input consists strictly of numbers, such as for phone numbers, ZIP codes, or other numeric-only fields. By using this function, you can quickly confirm that the string has no letters, spaces, or special characters, helping maintain clean and accurate data input.
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