Troubleshooting on 春江暮客 https://www.bobobk.com/en/tags/troubleshooting/ Recent content in Troubleshooting on 春江暮客 Hugo en Thu, 22 Oct 2026 22:31:19 +0800 Fix Python CSV Field Limits: Set a Character Cap and Test Boundaries https://www.bobobk.com/en/python-csv-field-size-limit.html Thu, 22 Oct 2026 22:31:19 +0800 https://www.bobobk.com/en/python-csv-field-size-limit.html Reproduce CSV field-limit errors, choose a finite character cap, and test multiline fields, broken quoting, exit codes, and restored parser settings. Fix Python UnicodeEncodeError in Linux Jobs: Inspect stdout and Select UTF-8 https://www.bobobk.com/en/python-linux-stdio-encoding.html Thu, 22 Oct 2026 13:43:51 +0800 https://www.bobobk.com/en/python-linux-stdio-encoding.html Reproduce ASCII stdout failures, fix standard streams with PYTHONIOENCODING or UTF-8 mode, and verify log bytes and file encodings. Fix Python BrokenPipeError with head and Verify Pipeline Exit Codes https://www.bobobk.com/en/python-broken-pipe-head.html Wed, 21 Oct 2026 22:09:37 +0800 https://www.bobobk.com/en/python-broken-pipe-head.html Reproduce early pipe closure, handle stdout writes and flushing at a CLI entry point, and verify buffering, broken pipes, and real failure statuses. Compare CSV Snapshots by ID with Python: Added, Removed, and Changed Records https://www.bobobk.com/en/python-csv-diff-by-key.html Wed, 21 Oct 2026 14:20:30 +0800 https://www.bobobk.com/en/python-csv-diff-by-key.html Compare CSV snapshots by a unique ID with the Python standard library, reject duplicate keys, and report additions, removals, and changed fields with automation-friendly exit codes. Split Large CSV Files with Python: Headers, Multiline Fields, and Completion Checks https://www.bobobk.com/en/python-split-csv-records.html Wed, 21 Oct 2026 06:22:30 +0800 https://www.bobobk.com/en/python-split-csv-records.html Split CSV records with the Python standard library, repeat headers, preserve multiline fields, and distinguish complete output from failed partial files. Fix Linux Argument list too long with find and Python https://www.bobobk.com/en/linux-argument-list-too-long-python.html Tue, 20 Oct 2026 20:56:06 +0800 https://www.bobobk.com/en/linux-argument-list-too-long-python.html Move filename lists into standard input or Python traversal to handle large trees, unusual names, and explicit failure exits. Read CSV Files Inside tar.gz with Python: Summaries Without Extraction https://www.bobobk.com/en/python-tar-gz-csv-without-extract.html Tue, 20 Oct 2026 14:24:08 +0800 https://www.bobobk.com/en/python-tar-gz-csv-without-extract.html Read a CSV member directly from tar.gz, reject duplicate names, validate input, and test failure exit codes. Reliable File Downloads in Python: Streaming, Size Limits, and SHA-256 https://www.bobobk.com/en/python-stream-download-sha256.html Tue, 20 Oct 2026 06:19:26 +0800 https://www.bobobk.com/en/python-stream-download-sha256.html Stream files with the Python standard library, verify length and SHA-256, and test that failed downloads preserve previous output. Fix Python Module Shadowing: Inspect Import Origins and Interpreter Paths https://www.bobobk.com/en/python-import-shadowing-path.html Mon, 19 Oct 2026 22:36:53 +0800 https://www.bobobk.com/en/python-import-shadowing-path.html Reproduce json.py shadowing, inspect the interpreter and import origin, compare isolated mode, and verify the fix with repeatable file and package collision tests. Troubleshoot Hostname Resolution with Python: getaddrinfo, IPv4/IPv6, and Wait Budgets https://www.bobobk.com/en/python-dns-getaddrinfo-check.html Mon, 19 Oct 2026 13:07:31 +0800 https://www.bobobk.com/en/python-dns-getaddrinfo-check.html Inspect system hostname resolution with Python, classify resolver errors, and bound automation waits with a child process. Test Directory Writes with Python: Permissions, Read-Only Storage, and Path Errors https://www.bobobk.com/en/python-directory-write-probe.html Mon, 19 Oct 2026 05:11:49 +0800 https://www.bobobk.com/en/python-directory-write-probe.html Probe an output directory with a tiny temporary file, report errno as JSON, and stop automation when writing fails. Fix Linux Script Startup Errors: Diagnose CRLF and BOM with Python https://www.bobobk.com/en/linux-script-crlf-bom-python.html Sun, 18 Oct 2026 15:32:46 +0800 https://www.bobobk.com/en/linux-script-crlf-bom-python.html Reproduce Linux script startup failures, inspect CRLF and UTF-8 BOM bytes, and verify a new LF copy without changing the source or overwriting files. Check TLS Certificate Expiry with Python: Verification, Warnings, and Local Tests https://www.bobobk.com/en/python-tls-certificate-expiry.html Sun, 18 Oct 2026 08:16:40 +0800 https://www.bobobk.com/en/python-tls-certificate-expiry.html Validate TLS certificates and check remaining validity with the Python standard library, JSON output, exit codes, and repeatable local tests. Probe TCP Ports with Python: Distinguish Refusal, Timeout, and System Errors https://www.bobobk.com/en/python-tcp-port-check.html Sun, 18 Oct 2026 00:37:00 +0800 https://www.bobobk.com/en/python-tcp-port-check.html Probe an IPv4 TCP endpoint with JSON and exit codes, then test listening ports, refused connections, and injected timeouts locally. Check ZIP Backups with Python: CRC, Duplicate Members, and Missing Files https://www.bobobk.com/en/python-zip-backup-check.html Sat, 17 Oct 2026 18:00:14 +0800 https://www.bobobk.com/en/python-zip-backup-check.html Validate ZIP backups without extraction, require expected files, and test corruption and failure exits. Validate CSV Structure with Python: Exact Headers, Column Order, and Field Counts https://www.bobobk.com/en/python-csv-schema-check.html Sat, 17 Oct 2026 11:43:33 +0800 https://www.bobobk.com/en/python-csv-schema-check.html Check exact CSV headers and field counts with the Python standard library, test multiline records and failure exit codes, and stop schema drift before imports. Check Disk Space with Python Before Starting a Batch Job https://www.bobobk.com/en/python-disk-space-preflight.html Sat, 17 Oct 2026 03:47:00 +0800 https://www.bobobk.com/en/python-disk-space-preflight.html Check free space at the output directory, combine peak demand with headroom, and stop jobs that exceed their budget. Find Broken Symlinks with Python: Separate Missing Targets, Permission Errors, and Loops https://www.bobobk.com/en/python-broken-symlinks.html Fri, 16 Oct 2026 20:43:14 +0800 https://www.bobobk.com/en/python-broken-symlinks.html Audit symlinks without modifying files, report JSON and exit codes, and test missing targets, permission failures, and link loops. Fix Python SQLite database is locked: Timeouts and Short Transactions https://www.bobobk.com/en/python-sqlite-database-locked.html Fri, 16 Oct 2026 11:55:49 +0800 https://www.bobobk.com/en/python-sqlite-database-locked.html Reproduce SQLite write contention with two processes, bound lock waiting, use short transactions, and verify rollback, exit codes, and final rows. Check Scheduled Output Freshness with Python: File Age, Empty Files, and Exit Codes https://www.bobobk.com/en/python-output-freshness-check.html Fri, 16 Oct 2026 04:03:00 +0800 https://www.bobobk.com/en/python-output-freshness-check.html Check report age, empty output, and future timestamps with the Python standard library, then verify JSON results and exit codes using repeatable failure tests. Find Large Files with Python: Rank a Directory with os.walk and heapq https://www.bobobk.com/en/python-largest-files-heapq.html Thu, 15 Oct 2026 21:24:44 +0800 https://www.bobobk.com/en/python-largest-files-heapq.html Scan regular-file metadata, keep the largest N entries, and verify size filters, symlink exclusions, and incomplete scans. Python Too Many Open Files: Find File Handle Leaks on Linux https://www.bobobk.com/en/python-too-many-open-files.html Thu, 15 Oct 2026 05:28:42 +0800 https://www.bobobk.com/en/python-too-many-open-files.html Reproduce descriptor exhaustion, inspect process limits and open files through /proc, then verify scoped file cleanup. Validate JSONL with Python: Find Broken Lines and Duplicate Keys https://www.bobobk.com/en/python-jsonl-validation.html Wed, 14 Oct 2026 20:57:24 +0800 https://www.bobobk.com/en/python-jsonl-validation.html Validate JSONL line by line, locate syntax and encoding errors, and gate batch jobs with reliable exit codes. Stream gzip Logs with Python and Detect Truncation and CRC Errors https://www.bobobk.com/en/python-gzip-log-integrity.html Wed, 14 Oct 2026 04:57:00 +0800 https://www.bobobk.com/en/python-gzip-log-integrity.html Count matching lines in gzip logs and verify that damaged files never produce a successful report. Python Task Configuration with tomllib: Validate TOML and Resolve Paths https://www.bobobk.com/en/python-tomllib-task-config.html Tue, 13 Oct 2026 20:03:45 +0800 https://www.bobobk.com/en/python-tomllib-task-config.html Load and validate TOML task settings with the Python standard library, override line limits, and verify stable paths and error exits. Fix Delayed Python Logs with -u, flush, and Bash pipefail https://www.bobobk.com/en/python-unbuffered-logs-pipefail.html Tue, 13 Oct 2026 05:57:21 +0800 https://www.bobobk.com/en/python-unbuffered-logs-pipefail.html Reproduce Python output buffering, show progress promptly with -u or flush=True, and preserve pipeline failures with Bash pipefail. Python HTTP JSON Requests: Timeouts, Bounded Retries, and Local Tests https://www.bobobk.com/en/python-http-json-timeout-retry.html Mon, 12 Oct 2026 22:07:11 +0800 https://www.bobobk.com/en/python-http-json-timeout-retry.html Fetch JSON with Python’s standard library, bound retries, and test 503 recovery, 404, invalid JSON, and timeouts locally. Troubleshoot Linux Scheduled Jobs: Python Paths, Working Directories, and Environment https://www.bobobk.com/en/linux-cron-python-path-cwd.html Sun, 11 Oct 2026 14:29:04 +0800 https://www.bobobk.com/en/linux-cron-python-path-cwd.html Reproduce scheduled-job path and environment failures, validate a fixed Python entry script, and apply the method to a temporary Hugo build. Rotate Python Logs by Size with RotatingFileHandler https://www.bobobk.com/en/python-rotating-logs.html Sun, 11 Oct 2026 07:36:35 +0800 https://www.bobobk.com/en/python-rotating-logs.html Configure size-based log rotation for a single-process Python script and verify backups, repeated runs, and failure records. Linux Disk Still Full After Deleting Files: Diagnose with df, du, and lsof https://www.bobobk.com/en/linux-disk-full-deleted-files.html Sat, 10 Oct 2026 15:47:24 +0800 https://www.bobobk.com/en/linux-disk-full-deleted-files.html Diagnose Linux disk pressure, distinguish blocks from inodes, and release deleted log files still held open by a process.