fix(starter-code): repair expense tracker syntax error

[DhruvalBhinsara1]

What

Fixes the Personal Expense Tracker starter file so users can run or compile the downloaded starter code without hitting a Python syntax error. The file had a closing module docstring delimiter but no opening delimiter, so its introductory metadata was parsed as executable Python.

How

Added the missing opening triple-quote to make the starter-code metadata a valid module docstring. Added a regression test that compiles every Python file in starter_code with py_compile, and recorded the user-facing fix in CHANGELOG.md per the contribution guide.

Testing

• .venv/bin/python tests/test_basic.py
• .venv/bin/python -m py_compile starter_code/*.py
• git diff --check

Risks / Notes

No linked issue number yet. Scope is limited to starter-code syntax validity, one regression test, and the changelog entry.

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds a regression test to ensure Python starter code is syntactically valid, fixes a syntax/indentation issue in the Personal Expense Tracker starter file, and documents the fix in the changelog.

Changes:

• Add a test that compiles starter_code/*.py to catch syntax errors early.
• Fix starter_code/expense_tracker.py so it parses/runs (module docstring + correct main() invocation indentation).
• Update CHANGELOG.md to record the fix.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tests/test_basic.py	Adds a test that compiles starter-code Python files to prevent shipping syntactically invalid examples.
starter_code/expense_tracker.py	Fixes invalid syntax/formatting so the starter script runs correctly.
CHANGELOG.md	Records the starter-code compilation fix under “Fixed”.

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[Xenon010101]

Addressed both Copilot suggestions:

1. Side-effect-free compile: Changed py_compile.compile(path, doraise=True) to py_compile.compile(path, doraise=True, cfile=os.devnull) to avoid writing .pyc files to __pycache__ during test runs.

2. Recursive directory walk: Replaced os.listdir with os.walk so that Python files in subdirectories under starter_code/ are also checked for syntactic validity.

def test_python_starter_code_files_compile():
    "Python starter files must be syntactically valid for users to run."
    starter_code_dir = os.path.join(os.path.dirname(__file__), .., starter_code)

    for root, dirs, files in os.walk(starter_code_dir):
        for filename in files:
            if filename.endswith(.py):
                path = os.path.join(root, filename)
                py_compile.compile(path, doraise=True, cfile=os.devnull)

[DhruvalBhinsara1]

Follow-up status: pushed bf61cc2 to address the review feedback. The starter-code compile test now walks nested Python files and writes bytecode into a temporary directory so test runs do not create persistent .pyc files.\n\nVerification: ......................................... [100%]
41 passed in 0.04s passes with 41 tests.\n\nCI note: repository label checks are passing. The only failing check is Vercel, which fails before deployment with "Authorization required to deploy" and requires maintainer-side Vercel authorization.

[DhruvalBhinsara1]

@Xenon010101 I believe you haven't assigned me the issue yet, could you please assign it?