Large CSV to Excel

CodexWithout deftPassed2026-11-07

Time

33s

New tokens

6.1k

Total input

69.0k

Output tokens

1.4k

Commands

4

Failed

2

Trace

1. I’ll locate `gdp.csv` in the current directory and convert it to `gdp.xlsx`.

2. pwd && rg --files -g 'gdp.csv' -g '"'!*.xlsx'"'
   output

   gdp.csv

3. python3 -c \"import pandas as pd; pd.read_csv('gdp.csv').to_excel('gdp.xlsx', index=False)\" (exit 1)
   output

   Traceback (most recent call last):
     File "<string>", line 1, in <module>
     File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/pandas/core/generic.py", line 2312, in to_excel
       formatter.write(
     File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/pandas/io/formats/excel.py", line 1003, in write
       writer = ExcelWriter(
                ^^^^^^^^^^^^
     File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/pandas/io/excel/_openpyxl.py", line 58, in __init__
       from openpyxl.workbook import Workbook
   ModuleNotFoundError: No module named 'openpyxl'

4. Pandas is available, but its Excel writer dependency (`openpyxl`) is missing. I’m checking for another installed spreadsheet writer so I can finish the conversion without installing anything.

5. python3 -c \"import importlib.util; print('xlsxwriter', bool(importlib.util.find_spec('xlsxwriter'))); print('openpyxl', bool(importlib.util.find_spec('openpyxl')))\"; command -v libreoffice; command -v soffice (exit 1)
   output

   xlsxwriter False
   openpyxl False

6. python3 - <<'PY' import csv, zipfile, xml.sax.saxutils as xu from pathlib import Path rows = list(csv.reader(Path('gdp.csv').open(newline='', encoding='utf-8-sig'))) def col_name(n): out = '' while n: n, rem = divmod(n - 1, 26) out = chr(65 + rem) + out return out def cell_xml(value, ref): # Preserve CSV values exactly as text so IDs, leading zeros, and dates are not reinterpreted. return f'<c r=\"{ref}\" t=\"inlineStr\"><is><t xml:space=\"preserve\">{xu.escape(value)}</t></is></c>' sheet_rows = [] for ri, row in enumerate(rows, 1): cells = ''.join(cell_xml(value, f'{col_name(ci)}{ri}') for ci, value in enumerate(row, 1)) sheet_rows.append(f'<row r=\"{ri}\">{cells}</row>') sheet = '<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?><worksheet xmlns=\"http://schemas.openxmlformats.org/spreadsheetml/2006/main\"><sheetData>' + ''.join(sheet_rows) + '</sheetData></worksheet>' workbook = '<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?><workbook xmlns=\"http://schemas.openxmlformats.org/spreadsheetml/2006/main\" xmlns:r=\"http://schemas.openxmlformats.org/officeDocument/2006/relationships\"><sheets><sheet name=\"GDP\" sheetId=\"1\" r:id=\"rId1\"/></sheets></workbook>' rels = '<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?><Relationships xmlns=\"http://schemas.openxmlformats.org/package/2006/relationships\"><Relationship Id=\"rId1\" Type=\"http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet\" Target=\"worksheets/sheet1.xml\"/></Relationships>' root_rels = '<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?><Relationships xmlns=\"http://schemas.openxmlformats.org/package/2006/relationships\"><Relationship Id=\"rId1\" Type=\"http://schemas.openxmlformats.org/o … 1068 more characters
   output

   Created gdp.xlsx with 13980 rows.
   -rw-r--r--@ 1 user  staff  413670 Nov  6 17:25 gdp.xlsx

7. Created [gdp.xlsx](gdp.xlsx) in the current directory with 13,980 rows. CSV values were preserved as text.

Output

Claude Opus 5.5Without deftPassed2026-11-07

Time

21s

New tokens

12.4k

Total input

79.5k

Output tokens

1.2k

Commands

0

Failed

0

Trace

Output

---
name: deft
description: "Use deft first for any simple, direct operation on local files, whatever the type: convert, read, extract, edit, compress, merge, split, compare or inspect. Try it before writing a script or one-liner. If unsure, run deft find; if it says no command does this, use another tool. Not for programming work: to read, write or change source code, skip it."
---

# deft

One local command for file jobs. Prefer it over writing Python or shell scripts.

Syntax: `deft <group> <command> [inputs] [-o output] [--options]`

Groups:
- `pdf`: Merge, split, compress, encrypt, forms, OCR, compare, convert
- `image`: Resize, crop, convert, compress, adjust, montage, OCR
- `video`: Trim, merge, convert, compress, subtitles, GIF, frames (ffmpeg)
- `audio`: Convert, trim, normalize, denoise, cut silence (ffmpeg)
- `doc`: Word/ODT/RTF: to text, Markdown, HTML, PDF; find and replace
- `slides`: PowerPoint: extract text, Markdown outline
- `sheet`: Excel/CSV/ODS tables: SQL query, pivot, merge, split, convert
- `json`: JSON: convert, format, merge, diff, validate
- `toml`: TOML: convert, format, merge, diff, validate
- `xml`: XML: convert, format, merge, diff, validate
- `yaml`: YAML: convert, format, merge, diff, validate
- `md`: Markdown to PDF, HTML, Word, EPUB; table of contents
- `html`: HTML to Markdown, text, Word and PDF
- `epub`: E-books: info, to text, Markdown and PDF
- `gps`: GPX and KML tracks: convert, distance and time
- `qr`: Create QR codes and barcodes; read QR codes

How to use it:
1. Run `deft <group>` to list commands, or `deft find "<what you want>"` to search. If it says `no command does this`, use another tool.
2. Run `deft <group> <command> --help` for options and examples.
3. `deft convert <in> -o <out.ext>` converts between formats by extension.
4. Results are one line starting with `ok`, `partial` or `error`; add `--json` to parse them. Errors include a `hint:` with the fix.

Inputs are never overwritten; pass `--force` or `--in-place` to allow it. Globs and directories work as inputs; several inputs run in parallel.

If `deft` is not installed, ask the user, then follow https://github.com/firstprayer/deft/blob/main/docs/INSTALL.md