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Summary

This pull request improves Python Fire’s CLI error handling when required positional arguments are missing.

Problem

Previously, missing required arguments resulted in a generic Python TypeError, which exposed an internal traceback and did not clearly guide users on how to fix the issue.

Solution

  • Intercepts missing-argument TypeError exceptions during command execution
  • Replaces them with a clear, user-friendly error message
  • Provides actionable usage guidance to help users quickly resolve the issue

Impact

This enhancement significantly improves developer experience and usability for Python Fire–based CLIs, especially for new users unfamiliar with Python tracebacks.

Example

Before
TypeError: greet() missing 1 required positional argument: 'name'

After
ERROR: The function received no value for the required argument: name
Usage: test_fire.py NAME

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google-cla bot commented Jan 19, 2026

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

@SLohit448 SLohit448 force-pushed the fix-better-missing-arg-error branch from 402206f to 8e5ab06 Compare January 19, 2026 16:38
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