pytablewriter

Summary

pytablewriter is a Python library to write a table in various formats: AsciiDoc / CSV / Elasticsearch / HTML / JavaScript / JSON / LaTeX / LDJSON / LTSV / Markdown / MediaWiki / NumPy / Excel / Pandas / Python / reStructuredText / SQLite / TOML / TSV / YAML.

Features

Write a table in various formats:
- Text formats:
  
  AsciiDoc
  
  CSV / Tab-separated values (TSV) / Space-separated values (SSV)
  
  HTML / CSS
  
  JSON / Line-delimited JSON(LDJSON)
  
  Labeled Tab-separated Values (LTSV)
  
  LaTeX: tabular/array environment
  
  Markdown: CommonMark / GitHub Flavored Markdown (GFM) / kramdown
  
  MediaWiki
  
  reStructuredText: Grid Tables/Simple Tables/CSV Table
  
  Source code (definition of a variable that represents tabular data)
  
  JavaScript / NumPy (numpy.array) / Pandas (pandas.DataFrame) / Python
  
  TOML
  
  YAML
  
  Unicode
- Binary file formats:
  
  Microsoft Excel ^TM (.xlsx/.xls file format)
  
  pandas.DataFrame pickle file
  
  SQLite database
- Application-specific formats:
  
  Elasticsearch
Automatic table cell formatting:
- Alignment
- Padding
- Decimal places of numbers
Customize table cell styles:
- Text/Background color
- Text alignment
- Font size/weight
- Thousand separator for numbers: e.g. 1,000/1 000
Configure output:
- Write a table to a stream such as a file/standard-output/string-buffer/Jupyter-Notebook
- Get rendered tabular text
Data sources:
- nested list
- CSV
- pandas.DataFrame / pandas.Series
- etc.
Multibyte character support
ANSI color support

Installation

Installation: pip

pip install pytablewriter

Some of the formats require additional dependency packages, you can install these packages as follows:

Installation of optional dependencies

Installation example	Remark
`pip install pytablewriter[es]`	Elasticsearch
`pip install pytablewriter[excel]`	Excel
`pip install pytablewriter[html]`	HTML
`pip install pytablewriter[sqlite]`	SQLite database
`pip install pytablewriter[toml]`	TOML
`pip install pytablewriter[theme]`	pytablewriter theme plugins
`pip install pytablewriter[all]`	Install all of the optional dependencies

Installation: conda

conda install -c conda-forge pytablewriter

Installation: apt

sudo add-apt-repository ppa:thombashi/ppa
sudo apt update
sudo apt install python3-pytablewriter

Examples

Write tables

Write a Markdown table

Sample Code

from pytablewriter import MarkdownTableWriter

def main():
    writer = MarkdownTableWriter(
        table_name="example_table",
        headers=["int", "float", "str", "bool", "mix", "time"],
        value_matrix=[
            [0,   0.1,      "hoge", True,   0,      "2017-01-01 03:04:05+0900"],
            [2,   "-2.23",  "foo",  False,  None,   "2017-12-23 45:01:23+0900"],
            [3,   0,        "bar",  "true",  "inf", "2017-03-03 33:44:55+0900"],
            [-10, -9.9,     "",     "FALSE", "nan", "2017-01-01 00:00:00+0900"],
        ],
    )
    writer.write_table()

if __name__ == "__main__":
    main()

Output

# example_table
|int|float|str |bool |  mix   |          time          |
|--:|----:|----|-----|-------:|------------------------|
|  0| 0.10|hoge|True |       0|2017-01-01 03:04:05+0900|
|  2|-2.23|foo |False|        |2017-12-23 12:34:51+0900|
|  3| 0.00|bar |True |Infinity|2017-03-03 22:44:55+0900|
|-10|-9.90|    |False|     NaN|2017-01-01 00:00:00+0900|

Rendering Result

Rendered markdown at GitHub

Write a Markdown table with margins

Sample Code

from pytablewriter import MarkdownTableWriter

def main():
    writer = MarkdownTableWriter(
        table_name="write a table with margins",
        headers=["int", "float", "str", "bool", "mix", "time"],
        value_matrix=[
            [0,   0.1,      "hoge", True,   0,      "2017-01-01 03:04:05+0900"],
            [2,   "-2.23",  "foo",  False,  None,   "2017-12-23 45:01:23+0900"],
            [3,   0,        "bar",  "true",  "inf", "2017-03-03 33:44:55+0900"],
            [-10, -9.9,     "",     "FALSE", "nan", "2017-01-01 00:00:00+0900"],
        ],
        margin=1  # add a whitespace for both sides of each cell
    )
    writer.write_table()

if __name__ == "__main__":
    main()

Output

# write a table with margins
| int | float | str  | bool  |   mix    |           time           |
| --: | ----: | ---- | ----- | -------: | ------------------------ |
|   0 |  0.10 | hoge | True  |        0 | 2017-01-01 03:04:05+0900 |
|   2 | -2.23 | foo  | False |          | 2017-12-23 12:34:51+0900 |
|   3 |  0.00 | bar  | True  | Infinity | 2017-03-03 22:44:55+0900 |
| -10 | -9.90 |      | False |      NaN | 2017-01-01 00:00:00+0900 |

margin attribute can be available for all of the text format writer classes.

Write a GitHub Flavored Markdown (GFM) table

If you set flavor keyword argument of MarkdownTableWriter class to "github" or "gfm", the writer will output markdown tables with GitHub flavor. GFM can apply some additional styles to tables such as fg_color (text color).

Sample Code

from pytablewriter import MarkdownTableWriter
from pytablewriter.style import Style

writer = MarkdownTableWriter(
    column_styles=[
        Style(fg_color="red"),
        Style(fg_color="green", decoration_line="underline"),
    ],
    headers=["A", "B"],
    value_matrix=[
        ["abc", 1],
        ["efg", 2],
    ],
    margin=1,
    flavor="github",
    enable_ansi_escape=False,
)
writer.write_table()

Rendered results can be found at here

Apply styles to GFM table with programmatically

Applying style filters to GFM allows for more flexible style settings for cells. See also the example

Write a Markdown table to a stream or a file

Refer an example

Write a table to an Excel sheet

Sample Code

from pytablewriter import ExcelXlsxTableWriter

def main():
    writer = ExcelXlsxTableWriter()
    writer.table_name = "example"
    writer.headers = ["int", "float", "str", "bool", "mix", "time"]
    writer.value_matrix = [
        [0,   0.1,      "hoge", True,   0,      "2017-01-01 03:04:05+0900"],
        [2,   "-2.23",  "foo",  False,  None,   "2017-12-23 12:34:51+0900"],
        [3,   0,        "bar",  "true",  "inf", "2017-03-03 22:44:55+0900"],
        [-10, -9.9,     "",     "FALSE", "nan", "2017-01-01 00:00:00+0900"],
    ]
    writer.dump("sample.xlsx")

if __name__ == "__main__":
    main()

Output

Output excel file (sample_single.xlsx)

Write a Unicode table

Sample Code

from pytablewriter import UnicodeTableWriter

def main():
    writer = UnicodeTableWriter(
        table_name="example_table",
        headers=["int", "float", "str", "bool", "mix", "time"],
        value_matrix=[
            [0,   0.1,      "hoge", True,   0,      "2017-01-01 03:04:05+0900"],
            [2,   "-2.23",  "foo",  False,  None,   "2017-12-23 45:01:23+0900"],
            [3,   0,        "bar",  "true",  "inf", "2017-03-03 33:44:55+0900"],
            [-10, -9.9,     "",     "FALSE", "nan", "2017-01-01 00:00:00+0900"],
        ]
    )
    writer.write_table()

if __name__ == "__main__":
    main()

Output

┌───┬─────┬────┬─────┬────────┬────────────────────────┐
│int│float│str │bool │  mix   │          time          │
├───┼─────┼────┼─────┼────────┼────────────────────────┤
│  0│ 0.10│hoge│True │       0│2017-01-01 03:04:05+0900│
├───┼─────┼────┼─────┼────────┼────────────────────────┤
│  2│-2.23│foo │False│        │2017-12-23 12:34:51+0900│
├───┼─────┼────┼─────┼────────┼────────────────────────┤
│  3│ 0.00│bar │True │Infinity│2017-03-03 22:44:55+0900│
├───┼─────┼────┼─────┼────────┼────────────────────────┤
│-10│-9.90│    │False│     NaN│2017-01-01 00:00:00+0900│
└───┴─────┴────┴─────┴────────┴────────────────────────┘

Write a table with JavaScript format (as a nested list variable definition)

Sample Code

import pytablewriter as ptw


def main():
    writer = ptw.JavaScriptTableWriter(
        table_name="js_variable",
        headers=["int", "float", "str", "bool", "mix", "time"],
        value_matrix=[
            [0, 0.1, "hoge", True, 0, "2017-01-01 03:04:05+0900"],
            [2, "-2.23", "foo", False, None, "2017-12-23 45:01:23+0900"],
            [3, 0, "bar", "true", "inf", "2017-03-03 33:44:55+0900"],
            [-10, -9.9, "", "FALSE", "nan", "2017-01-01 00:00:00+0900"],
        ],
    )

    writer.write_table()


if __name__ == "__main__":
    main()

Output

const js_variable = [
    ["int", "float", "str", "bool", "mix", "time"],
    [0, 0.1, "hoge", true, 0, "2017-01-01 03:04:05+0900"],
    [2, -2.23, "foo", false, null, "2017-12-23 45:01:23+0900"],
    [3, 0, "bar", true, Infinity, "2017-03-03 33:44:55+0900"],
    [-10, -9.9, "", "FALSE", NaN, "2017-01-01 00:00:00+0900"]
];

Write a Markdown table from `pandas.DataFrame` instance

from_dataframe method of writer classes will set up tabular data from pandas.DataFrame:

Sample Code

from textwrap import dedent
import pandas as pd
import io
from pytablewriter import MarkdownTableWriter

def main():
    csv_data = io.StringIO(dedent("""\
        "i","f","c","if","ifc","bool","inf","nan","mix_num","time"
        1,1.10,"aa",1.0,"1",True,Infinity,NaN,1,"2017-01-01 00:00:00+09:00"
        2,2.20,"bbb",2.2,"2.2",False,Infinity,NaN,Infinity,"2017-01-02 03:04:05+09:00"
        3,3.33,"cccc",-3.0,"ccc",True,Infinity,NaN,NaN,"2017-01-01 00:00:00+09:00"
        """))
    df = pd.read_csv(csv_data, sep=',')

    writer = MarkdownTableWriter(dataframe=df)
    writer.write_table()

if __name__ == "__main__":
    main()

Output

| i | f  | c  | if |ifc|bool |  inf   |nan|mix_num |          time           |
|--:|---:|----|---:|---|-----|--------|---|-------:|-------------------------|
|  1|1.10|aa  | 1.0|  1|True |Infinity|NaN|       1|2017-01-01 00:00:00+09:00|
|  2|2.20|bbb | 2.2|2.2|False|Infinity|NaN|Infinity|2017-01-02 03:04:05+09:00|
|  3|3.33|cccc|-3.0|ccc|True |Infinity|NaN|     NaN|2017-01-01 00:00:00+09:00|

Adding a column of the DataFrame index if you specify add_index_column=True:

Sample Code

import pandas as pd
import pytablewriter as ptw

def main():
    writer = ptw.MarkdownTableWriter(table_name="add_index_column")
    writer.from_dataframe(
        pd.DataFrame({"A": [1, 2], "B": [10, 11]}, index=["a", "b"]),
        add_index_column=True,
    )
    writer.write_table()

if __name__ == "__main__":
    main()

Output

# add_index_column
|   | A | B |
|---|--:|--:|
|a  |  1| 10|
|b  |  2| 11|

Write a Markdown table from space-separated values

Sample Code

import pytablewriter as ptw


def main():
    writer = ptw.MarkdownTableWriter(table_name="ps")
    writer.from_csv(
        """
        USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
        root         1  0.0  0.4  77664  8784 ?        Ss   May11   0:02 /sbin/init
        root         2  0.0  0.0      0     0 ?        S    May11   0:00 [kthreadd]
        root         4  0.0  0.0      0     0 ?        I<   May11   0:00 [kworker/0:0H]
        root         6  0.0  0.0      0     0 ?        I<   May11   0:00 [mm_percpu_wq]
        root         7  0.0  0.0      0     0 ?        S    May11   0:01 [ksoftirqd/0]
        """,
        delimiter=" ",
    )
    writer.write_table()


if __name__ == "__main__":
    main()

Output

# ps
|USER|PID|%CPU|%MEM| VSZ |RSS |TTY|STAT|START|TIME|   COMMAND    |
|----|--:|---:|---:|----:|---:|---|----|-----|----|--------------|
|root|  1|   0| 0.4|77664|8784|?  |Ss  |May11|0:02|/sbin/init    |
|root|  2|   0| 0.0|    0|   0|?  |S   |May11|0:00|[kthreadd]    |
|root|  4|   0| 0.0|    0|   0|?  |I<  |May11|0:00|[kworker/0:0H]|
|root|  6|   0| 0.0|    0|   0|?  |I<  |May11|0:00|[mm_percpu_wq]|
|root|  7|   0| 0.0|    0|   0|?  |S   |May11|0:01|[ksoftirqd/0] |

Get rendered tabular text as str

dumps method returns rendered tabular text. dumps only available for text format writers.

Sample Code

import pytablewriter as ptw


def main():
    writer = ptw.MarkdownTableWriter(
        headers=["int", "float", "str", "bool", "mix", "time"],
        value_matrix=[
            [0, 0.1, "hoge", True, 0, "2017-01-01 03:04:05+0900"],
            [2, "-2.23", "foo", False, None, "2017-12-23 45:01:23+0900"],
            [3, 0, "bar", "true", "inf", "2017-03-03 33:44:55+0900"],
            [-10, -9.9, "", "FALSE", "nan", "2017-01-01 00:00:00+0900"],
        ],
    )

    print(writer.dumps())


if __name__ == "__main__":
    main()

Output

|int|float|str |bool |  mix   |          time          |
|--:|----:|----|-----|-------:|------------------------|
|  0| 0.10|hoge|True |       0|2017-01-01 03:04:05+0900|
|  2|-2.23|foo |False|        |2017-12-23 45:01:23+0900|
|  3| 0.00|bar |True |Infinity|2017-03-03 33:44:55+0900|
|-10|-9.90|    |False|     NaN|2017-01-01 00:00:00+0900|

Configure table styles

Column styles

Writers can specify Style for each column by column_styles attribute of writer classes.

Sample Code

import pytablewriter as ptw
from pytablewriter.style import Style


def main():
    writer = ptw.MarkdownTableWriter(
        table_name="set style by column_styles",
        headers=[
            "auto align",
            "left align",
            "center align",
            "bold",
            "italic",
            "bold italic ts",
        ],
        value_matrix=[
            [11, 11, 11, 11, 11, 11],
            [1234, 1234, 1234, 1234, 1234, 1234],
        ],
        column_styles=[
            Style(),
            Style(align="left"),
            Style(align="center"),
            Style(font_weight="bold"),
            Style(font_style="italic"),
            Style(font_weight="bold", font_style="italic", thousand_separator=","),
        ],  # specify styles for each column
    )
    writer.write_table()


if __name__ == "__main__":
    main()

Output

# set style by styles
|auto align|left align|center align|  bold  |italic|bold italic ts|
|---------:|----------|:----------:|-------:|-----:|-------------:|
|        11|11        |     11     |  **11**|  _11_|      _**11**_|
|      1234|1234      |    1234    |**1234**|_1234_|   _**1,234**_|

Rendering result

You can also set Style to a specific column with an index or header by using set_style method:

Sample Code

from pytablewriter import MarkdownTableWriter
from pytablewriter.style import Style

def main():
    writer = MarkdownTableWriter()
    writer.headers = ["A", "B", "C",]
    writer.value_matrix = [[11, 11, 11], [1234, 1234, 1234]]

    writer.table_name = "set style by column index"
    writer.set_style(1, Style(align="center", font_weight="bold"))
    writer.set_style(2, Style(thousand_separator=" "))
    writer.write_table()
    writer.write_null_line()

    writer.table_name = "set style by header"
    writer.set_style("B", Style(font_style="italic"))
    writer.write_table()

if __name__ == "__main__":
    main()

Output

# set style by column index
| A  |   B    |  C  |
|---:|:------:|----:|
|  11| **11** |   11|
|1234|**1234**|1 234|

# set style by header
| A  |  B   |  C  |
|---:|-----:|----:|
|  11|  _11_|   11|
|1234|_1234_|1 234|

Style filter

You can apply styles to specific cells by using style filters. Style filters will be written as Python functions. Examples of a style filter function and how you apply it are as follows:

Sample Code

from typing import Any, Optional

from pytablewriter import MarkdownTableWriter
from pytablewriter.style import Cell, Style


def style_filter(cell: Cell, **kwargs: Any) -> Optional[Style]:
    if cell.is_header_row():
        return None

    if cell.col == 0:
        return Style(font_weight="bold")

    value = int(cell.value)

    if value > 80:
        return Style(fg_color="red", font_weight="bold", decoration_line="underline")
    elif value > 50:
        return Style(fg_color="yellow", font_weight="bold")
    elif value > 20:
        return Style(fg_color="green")

    return Style(fg_color="lightblue")


writer = MarkdownTableWriter(
    table_name="style filter example",
    headers=["Key", "Value 1", "Value 2"],
    value_matrix=[
        ["A", 95, 40],
        ["B", 55, 5],
        ["C", 30, 85],
        ["D", 0, 69],
    ],
    flavor="github",
    enable_ansi_escape=False,
)
writer.add_style_filter(style_filter)
writer.write_table()

Rendered results can be found at here

Theme

Theme <https://pytablewriter.readthedocs.io/en/latest/pages/reference/theme.html#pytablewriter.style.Theme> consists of a set of style filters. The following command will install external predefined themes:

pip install pytablewriter[theme]

Themes can be set via the constructor of the writer classes or the set_theme method. The following is an example of setting the altrow theme via the constructor. altrow theme will be colored rows alternatively:

Sample Code

import pytablewriter as ptw

writer = ptw.TableWriterFactory.create_from_format_name(
    "markdown",
    headers=["INT", "STR"],
    value_matrix=[[1, "hoge"], [2, "foo"], [3, "bar"]],
    margin=1,
    theme="altrow",
)
writer.write_table()

Output

[theme] extras includes the following themes:

Make tables for specific applications

Render a table on Jupyter Notebook

All table writer class instances in pytablewriter can render in Jupyter Notebook. To render writers at notebook cells, you will require the dependency packages to be installed either by:

pip install pytablewriter[html] or
pip install pytablewriter[all]

Jupyter Notebook code examples can be found here:

Table rendering results of Jupyter Notebook

Multibyte character support

Write a table using multibyte character

You can use multibyte characters as table data. Multibyte characters are also properly padded and aligned.

Sample Code

import pytablewriter as ptw


def main():
    writer = ptw.RstSimpleTableWriter(
        table_name="生成に関するパターン",
        headers=["パターン名", "概要", "GoF", "Code Complete[1]"],
        value_matrix=[
            ["Abstract Factory", "関連する一連のインスタンスを状況に応じて、適切に生成する方法を提供する。", "Yes", "Yes"],
            ["Builder", "複合化されたインスタンスの生成過程を隠蔽する。", "Yes", "No"],
            ["Factory Method", "実際に生成されるインスタンスに依存しない、インスタンスの生成方法を提供する。", "Yes", "Yes"],
            ["Prototype", "同様のインスタンスを生成するために、原型のインスタンスを複製する。", "Yes", "No"],
            ["Singleton", "あるクラスについて、インスタンスが単一であることを保証する。", "Yes", "Yes"],
        ],
    )
    writer.write_table()


if __name__ == "__main__":
    main()

Output

Output of multi-byte character table

Multiprocessing

You can increase the number of workers to process table data via max_workers attribute of a writer. The more max_workers the less processing time when tabular data is large and the execution environment has available cores.

If you increase max_workers larger than one, recommend using main guarded as follows to avoid problems caused by multi-processing:

from multiprocessing import cpu_count
import pytablewriter as ptw

def main():
    writer = ptw.MarkdownTableWriter()
    writer.max_workers = cpu_count()
    ...

if __name__ == "__main__":
    main()