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CSV Parsing Pitfalls: Quotes, Embedded Newlines, Encodings, Excel and Delimiters in Python

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Self-Hosting & Infra beginner 7 min read $0.01 Updated 2026-10-20

Handling real-world CSV: csv.reader versus split, quoting and embedded newlines, newline parameter, BOM and cp1252, delimiter sniffing, leading zeros and long numbers, formula injection and exporting for Excel.

Your CSV import shifts columns, shows broken characters, or loses leading zeros. Use the csv module correctly, detect delimiters and encodings, keep IDs as text, and write files Excel opens properly.

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#csv#python#excel#encoding#data-cleaning

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