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Comma-separate thousands or custom formatting in a column?

See original GitHub issue

import pytablewriter

data = [
    {"category": "2.6", "date": "2018-08-15", "downloads": 51},
    {"category": "2.7", "date": "2018-08-15", "downloads": 63749},
    {"category": "3.2", "date": "2018-08-15", "downloads": 2},
    {"category": "3.3", "date": "2018-08-15", "downloads": 40},
    {"category": "3.4", "date": "2018-08-15", "downloads": 6095},
    {"category": "3.5", "date": "2018-08-15", "downloads": 20358},
    {"category": "3.6", "date": "2018-08-15", "downloads": 35274},
    {"category": "3.7", "date": "2018-08-15", "downloads": 6595},
    {"category": "3.8", "date": "2018-08-15", "downloads": 3},
    {"category": "null", "date": "2018-08-15", "downloads": 1019},
]

writer = pytablewriter.MarkdownTableWriter()
writer.margin = 1

writer.header_list = sorted(set().union(*(d.keys() for d in data)))
writer.value_matrix = data

writer.write_table()

Produces:

category	date	downloads
2.6	2018-08-15	51
2.7	2018-08-15	63749
3.2	2018-08-15	2
3.3	2018-08-15	40
3.4	2018-08-15	6095
3.5	2018-08-15	20358
3.6	2018-08-15	35274
3.7	2018-08-15	6595
3.8	2018-08-15	3
null	2018-08-15	1019

I’d like the downloads to have comma-separated thousands to increase readability:

category	date	downloads
2.6	2018-08-15	51
2.7	2018-08-15	63,749
3.2	2018-08-15	2
3.3	2018-08-15	40
3.4	2018-08-15	6,095
3.5	2018-08-15	20,358
3.6	2018-08-15	35,274
3.7	2018-08-15	6,595
3.8	2018-08-15	3
null	2018-08-15	1,019

I can preprocess the data:

new_data = []

for row in data:
    row["downloads"] = "{:,}".format(row["downloads"])
    new_data.append(row)

data = new_data

category	date	downloads
2.6	2018-08-15	51
2.7	2018-08-15	63,749
3.2	2018-08-15	2
3.3	2018-08-15	40
3.4	2018-08-15	6,095
3.5	2018-08-15	20,358
3.6	2018-08-15	35,274
3.7	2018-08-15	6,595
3.8	2018-08-15	3
null	2018-08-15	1,019

And then explicitly right-format the column:

from pytablewriter import Align
writer.align_list = [Align.AUTO, Align.AUTO, Align.RIGHT]

# Or more generically:
writer.align_list = [Align.AUTO] * len(writer.header_list)
download_index = writer.header_list.index("downloads")
writer.align_list[download_index] = Align.RIGHT

category	date	downloads
2.6	2018-08-15	51
2.7	2018-08-15	63,749
3.2	2018-08-15	2
3.3	2018-08-15	40
3.4	2018-08-15	6,095
3.5	2018-08-15	20,358
3.6	2018-08-15	35,274
3.7	2018-08-15	6,595
3.8	2018-08-15	3
null	2018-08-15	1,019

But is there a neater way? Would some option to format numbers with comma-separated thousands be possible or sensible? Or perhaps custom formatting?

from pytablewriter import Format
writer.format_list = [None, None, Format.Comma]
writer.format_list = [None, None, "{:,}"]

That could cover cases that format numbers like 12 345.6 or 12.345,6, and also allow other formatting options.

Thank you.

Issue Analytics

State:
Created 5 years ago
Comments:9 (8 by maintainers)

Top GitHub Comments

2reactions

thombashicommented, Sep 26, 2018

@hugovk Thank you for your feedback. Surely, number formatting specifier interface would be a nice feature. I will consider the feature for the future release (probably the next release).

1reaction

thombashicommented, Jan 2, 2019

I integrated format_list attribute into style_list attribute at pytablewriter 0.37.0. format_list can still be used (may be removed in the future release).

https://pytablewriter.readthedocs.io/en/latest/pages/examples/style/index.html

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