fix: add safe_float() to handle empty string conversions (issue #44) #48

agentson · 2026-02-05T00:15:28+09:00

agentson commented

2026-02-05 00:15:28 +09:00

Summary

Add safe_float() helper function for safe type conversion
Replace all float() calls in trading_cycle with safe_float()
Handle empty strings, None, and invalid values gracefully

Problem

Docker logs showed float conversion errors (15% of failures):

could not convert string to float: ''
Failed to scan AAPL (US_NASDAQ)

KIS API returns empty strings when:

Market is closed
Data is temporarily unavailable
Stock has no trading activity

Solution

def safe_float(value: str | float | None, default: float = 0.0) -> float:
    """Convert to float, handling empty strings and None."""
    if value is None or value == "":
        return default
    try:
        return float(value)
    except (ValueError, TypeError):
        return default

Applied to all float conversions:

Orderbook prices (stck_prpr, frgn_ntby_qty)
Balance amounts (tot_evlu_amt, dnca_tot_amt, pchs_amt_smtl_amt)
Overseas prices and balances

Test Coverage

✅ 6 new unit tests for safe_float()
- Valid strings: "123.45" → 123.45
- Empty strings: "" → 0.0
- None values: None → 0.0
- Invalid strings: "abc" → 0.0
- Float inputs: 123.45 → 123.45
- Custom defaults: safe_float("", -1.0) → -1.0
✅ All existing tests pass (283 total, +6 new)
✅ Coverage maintained at 80%

Benefits

No more crashes on empty string responses
Graceful degradation (defaults to 0.0)
Clear, reusable utility function
Well-documented with docstring examples

Closes

Closes #44

🤖 Generated with Claude Code

## Summary - Add `safe_float()` helper function for safe type conversion - Replace all `float()` calls in trading_cycle with `safe_float()` - Handle empty strings, None, and invalid values gracefully ## Problem Docker logs showed float conversion errors (15% of failures): ``` could not convert string to float: '' Failed to scan AAPL (US_NASDAQ) ``` KIS API returns empty strings when: - Market is closed - Data is temporarily unavailable - Stock has no trading activity ## Solution ```python def safe_float(value: str | float | None, default: float = 0.0) -> float: """Convert to float, handling empty strings and None.""" if value is None or value == "": return default try: return float(value) except (ValueError, TypeError): return default ``` Applied to all float conversions: - Orderbook prices (`stck_prpr`, `frgn_ntby_qty`) - Balance amounts (`tot_evlu_amt`, `dnca_tot_amt`, `pchs_amt_smtl_amt`) - Overseas prices and balances ## Test Coverage - ✅ 6 new unit tests for safe_float() - Valid strings: `"123.45"` → `123.45` - Empty strings: `""` → `0.0` - None values: `None` → `0.0` - Invalid strings: `"abc"` → `0.0` - Float inputs: `123.45` → `123.45` - Custom defaults: `safe_float("", -1.0)` → `-1.0` - ✅ All existing tests pass (283 total, +6 new) - ✅ Coverage maintained at 80% ## Benefits - No more crashes on empty string responses - Graceful degradation (defaults to 0.0) - Clear, reusable utility function - Well-documented with docstring examples ## Closes Closes #44 🤖 Generated with [Claude Code](https://claude.com/claude-code)

agentson added 1 commit 2026-02-05 00:15:28 +09:00

fix: add safe_float() to handle empty string conversions (issue #44 )

CI / test (pull_request) Has been cancelled

Details

c57ccc4bca

Add safe_float() helper function to safely convert API response values
to float, handling empty strings, None, and invalid values that cause
ValueError: "could not convert string to float: ''".

Changes:
- Add safe_float() function in src/main.py with full docstring
- Replace all float() calls with safe_float() in trading_cycle()
  - Domestic market: orderbook prices, balance amounts
  - Overseas market: price data, balance info
- Add 6 comprehensive unit tests for safe_float()

The function handles:
- Empty strings ("") → default (0.0)
- None values → default (0.0)
- Invalid strings ("abc") → default (0.0)
- Valid strings ("123.45") → parsed float
- Float inputs (123.45) → pass through

This prevents crashes when KIS API returns empty strings during
market closed hours or data unavailability.

Fixes: #44

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

jihoson merged commit 33b5ff5e54 into main

2026-02-05 00:18:22 +09:00

jihoson referenced this issue from a commit

2026-02-05 00:18:24 +09:00

Merge pull request 'fix: add safe_float() to handle empty string conversions (issue #44)' (#48) from feature/issue-44-safe-float into main

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Reference: jihoson/The-Ouroboros#48