Tag: Python
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5 NumPy Tricks That Cut Portfolio Backtest Time by 10x
Cut backtest runtime from 45 minutes to 4 with stride tricks, vectorized position logic, and array broadcasting. Real before/after benchmarks.
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Why Excel Still Beats Python for 80% of Data Analysis
Excel beats Python for most business data tasks. Here's when to use each โ based on real timing comparisons, cognitive load, and iteration speed.
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Pre-commit Hooks That Break CI: 5 Fixes from 50+ Repos
Your pre-commit hook passes locally but CI fails with the same check. Here's why it happens and 5 fixes that actually work.
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Python __slots__: 40% Memory Savings and Interview Gotchas
Cut Python class memory by 40% with __slots__โplus the 3 gotchas interviewers use to catch candidates who only read the docs.
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Polars vs Pandas 2026: Benchmarks on Joins, Strings, I/O
Polars beats Pandas 9x on joins but loses on strings. Real benchmarks show when migration pays off and when it wastes your time.
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Stock Data API Debugging: 5 Silent Failures You’ll Hit
Stock APIs return 200 OK with corrupt data. Detect split adjustments, survivorship bias, and timezone drift before they ruin your backtest.
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PaddleOCR Optimization: Caching, Warmup, and Quantization Benchmarks
PaddleOCR ocr.predict vs ocr.ocr performance compared. Benchmark caching, warmup, and INT8 quantization โ init time drops 73% with the right setup.
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15 Coding Interview Patterns: Complete Python Reference
Master 15 coding patterns from Two Pointers to Monotonic Stack. Includes Python code, O(n) complexity proofs, and how to spot each pattern.