Count Word Frequencies in Text File Unit Test #code

Reference https://youtu.be/_vn7nwxmdtg a Unit Test utilizing Python unittest framework: https://docs.python.org/3/library/unittest.html

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Scenario Context: In engineering roles, you often build quick utilities for file processing without relying on external services. Here, the tool reads a file, counts words (ignoring case and punctuation), and outputs the top N frequent words, handling errors like missing files.

Personal experience: JP Morgan Software Engineer Interview Questions

Simplify Transformation: Write a Python script to count word frequencies in a text file, which is common in tasks like analyzing logs, processing reports, or basic data mining.
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