Python script flags failing endpoints and slow requests in fictional iPhone log demo

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A DEV Community tutorial shows how to build a small Python log analyzer that runs on an iPhone using only the standard library, requiring no server or network connection. The script parses simplified, fictional access-log lines, rejecting malformed entries while keeping their line numbers visible. It counts HTTP 5xx server failures, computes a 30% server-error rate across ten parsed requests, and reports a 195 ms median latency. It also ranks the slowest requests and groups failures by endpoint, with checkout showing the most errors. The author stresses that such summaries point to where to investigate rather than revealing the underlying cause.

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