Printable
CLI and functions help for printing tabular data.
Install
pip3 install printable
Rendering Engines
Two engines render tables: python (pure Python) and column (a ctypes binding of the compiled util-linux column command). By default (auto), the column engine is used when no --grid is set, and falls back to the python engine if the shared library is missing; grid styles always use the python engine. Select explicitly with -e python|column|auto.
Width calculation uses the native library when available and falls back to pure Python otherwise. 5000×6 mixed zh-en rows (make bench):
| engine | width calc | median (ms) | speedup (vs original) | speed up (vs now) |
|---|---|---|---|---|
| python (original) | pure Python | 322 | 1.0x | |
| python (now) | pure Python | 75 | 4.3x | 1.0x |
| python + C width | native C | 27 | 11.9x | 2.8x |
| column | native C | 17 | 18.9x | 4.4x |
The original row is the pre-optimization implementation (git a5ce114): per-cell wcswidth, per-character control normalization, and duplicated row formatting. Optimizations: batched width calculation via the native library, flattened single-call batch, and regex-based normalization.
Usage Example
from printable import readable
print(readable(list_of_dict, grid='full'))
$ printable -t csv -f samples/sample.csv
symbol desp last change changeper turnover changesign lastupdate
HSI 恆指 26623 -468 1.73% 802億 - 2018/10/04 16:09
HSCEI 國指 10547 -239 2.21% 257億 - 2018/10/04 16:08
000001.SH 上證指數 2821 29 1.06% 1254億 + 2018/09/28 15:10
000300.SH 滬深 300 3438 35 1.04% 949億 + 2018/09/28 15:10
USDHKD 港匯 7.8337 -0.0037 -0.0472% -
$ printable -t csv -f samples/sample.csv --grid inner
symbol │ desp │ last │ change │ changeper │ turnover │ changesign │ lastupdate
───────────┼──────────┼────────┼─────────┼───────────┼──────────┼────────────┼──────────────────
HSI │ 恆指 │ 26623 │ -468 │ 1.73% │ 802億 │ - │ 2018/10/04 16:09
───────────┼──────────┼────────┼─────────┼───────────┼──────────┼────────────┼──────────────────
HSCEI │ 國指 │ 10547 │ -239 │ 2.21% │ 257億 │ - │ 2018/10/04 16:08
───────────┼──────────┼────────┼─────────┼───────────┼──────────┼────────────┼──────────────────
000001.SH │ 上證指數 │ 2821 │ 29 │ 1.06% │ 1254億 │ + │ 2018/09/28 15:10
───────────┼──────────┼────────┼─────────┼───────────┼──────────┼────────────┼──────────────────
000300.SH │ 滬深 300 │ 3438 │ 35 │ 1.04% │ 949億 │ + │ 2018/09/28 15:10
───────────┼──────────┼────────┼─────────┼───────────┼──────────┼────────────┼──────────────────
USDHKD │ 港匯 │ 7.8337 │ -0.0037 │ -0.0472% │ │ - │
$ printable -t csv -f samples/sample.csv --grid full
┌───────────┬──────────┬────────┬─────────┬───────────┬──────────┬────────────┬──────────────────┐
│ symbol │ desp │ last │ change │ changeper │ turnover │ changesign │ lastupdate │
├───────────┼──────────┼────────┼─────────┼───────────┼──────────┼────────────┼──────────────────┤
│ HSI │ 恆指 │ 26623 │ -468 │ 1.73% │ 802億 │ - │ 2018/10/04 16:09 │
├───────────┼──────────┼────────┼─────────┼───────────┼──────────┼────────────┼──────────────────┤
│ HSCEI │ 國指 │ 10547 │ -239 │ 2.21% │ 257億 │ - │ 2018/10/04 16:08 │
├───────────┼──────────┼────────┼─────────┼───────────┼──────────┼────────────┼──────────────────┤
│ 000001.SH │ 上證指數 │ 2821 │ 29 │ 1.06% │ 1254億 │ + │ 2018/09/28 15:10 │
├───────────┼──────────┼────────┼─────────┼───────────┼──────────┼────────────┼──────────────────┤
│ 000300.SH │ 滬深 300 │ 3438 │ 35 │ 1.04% │ 949億 │ + │ 2018/09/28 15:10 │
├───────────┼──────────┼────────┼─────────┼───────────┼──────────┼────────────┼──────────────────┤
│ USDHKD │ 港匯 │ 7.8337 │ -0.0037 │ -0.0472% │ │ - │ │
└───────────┴──────────┴────────┴─────────┴───────────┴──────────┴────────────┴──────────────────┘
$ printable -t csv -f samples/sample.csv --grid markdown
| symbol | desp | last | change | changeper | turnover | changesign | lastupdate |
|-----------|----------|--------|---------|-----------|----------|------------|------------------|
| HSI | 恆指 | 26623 | -468 | 1.73% | 802億 | - | 2018/10/04 16:09 |
| HSCEI | 國指 | 10547 | -239 | 2.21% | 257億 | - | 2018/10/04 16:08 |
| 000001.SH | 上證指數 | 2821 | 29 | 1.06% | 1254億 | + | 2018/09/28 15:10 |
| 000300.SH | 滬深 300 | 3438 | 35 | 1.04% | 949億 | + | 2018/09/28 15:10 |
| USDHKD | 港匯 | 7.8337 | -0.0037 | -0.0472% | | - | |
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