Web Reference: Jul 23, 2025 · In this article, we will see some methods and reasons for occurring and solving the Valueerror Exceptions In Python. What is ValueError in Python? The ValueError Exception is often raised in Python when an invalid value is assigned to a variable or passed to a function while calling it. Feb 5, 2019 · If that is what you are trying to do, specify them as defaults. Your code is specifying them as argument names (like --confidence) which is why argparse is telling you they must begin with a hyphen. Jan 9, 2026 · I’m going to show you how I approach ValueError in day‑to‑day Python work. You’ll see the most common triggers, the fastest ways to isolate the root cause, and the fixes I actually use on modern codebases in 2026.
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