txtble 0.6.0

Yet another plain-text table typesetter

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Contents

• Installation

• Examples

• API

  • Txtble

  • Configuration Options

  • BorderStyle

  • Unicode in Python 2

txtble is yet another Python library for creating plain-text tables. (All the good names were taken, OK?) Pass in a list of lists of strings (or other stringable things) and get out something nice like:

+---------+----------+------------------+
|Month    |Birthstone|Birth Flower      |
+---------+----------+------------------+
|January  |Garnet    |Carnation         |
|February |Amethyst  |Violet            |
|March    |Aquamarine|Jonquil           |
|April    |Diamond   |Sweetpea          |
|May      |Emerald   |Lily Of The Valley|
|June     |Pearl     |Rose              |
|July     |Ruby      |Larkspur          |
|August   |Peridot   |Gladiolus         |
|September|Sapphire  |Aster             |
|October  |Opal      |Calendula         |
|November |Topaz     |Chrysanthemum     |
|December |Turquoise |Narcissus         |
+---------+----------+------------------+

Features:

• ANSI color aware

• Unicode fullwidth & combining character aware

• Customize characters used for drawing borders

• Left-align, center, and right-align individual columns

• Toggle inter-row, inter-column, and outer borders

• Set the value used to fill out ragged rows

• Pad cells on the left & right

Installation

Just use pip (You have pip, right?) to install txtble and its dependencies:

pip install txtble

Examples

Construct & show a basic table:

>>> from txtble import Txtble
>>> # Taken from /usr/share/misc/birthtoken.gz in Ubuntu Xenial's miscfiles package:
>>> HEADERS = ['Month', 'Birthstone', 'Birth Flower']
>>> DATA = [
...     ['January',   'Garnet',     'Carnation'],
...     ['February',  'Amethyst',   'Violet'],
...     ['March',     'Aquamarine', 'Jonquil'],
...     ['April',     'Diamond',    'Sweetpea'],
...     ['May',       'Emerald',    'Lily Of The Valley'],
...     ['June',      'Pearl',      'Rose'],
...     ['July',      'Ruby',       'Larkspur'],
...     ['August',    'Peridot',    'Gladiolus'],
...     ['September', 'Sapphire',   'Aster'],
...     ['October',   'Opal',       'Calendula'],
...     ['November',  'Topaz',      'Chrysanthemum'],
...     ['December',  'Turquoise',  'Narcissus'],
... ]
>>> tbl = Txtble(DATA, headers=HEADERS)
>>> print(tbl)
+---------+----------+------------------+
|Month    |Birthstone|Birth Flower      |
+---------+----------+------------------+
|January  |Garnet    |Carnation         |
|February |Amethyst  |Violet            |
|March    |Aquamarine|Jonquil           |
|April    |Diamond   |Sweetpea          |
|May      |Emerald   |Lily Of The Valley|
|June     |Pearl     |Rose              |
|July     |Ruby      |Larkspur          |
|August   |Peridot   |Gladiolus         |
|September|Sapphire  |Aster             |
|October  |Opal      |Calendula         |
|November |Topaz     |Chrysanthemum     |
|December |Turquoise |Narcissus         |
+---------+----------+------------------+

The table can also be constructed like this:

>>> tbl = Txtble(headers=HEADERS)
>>> tbl.extend(DATA)

Or like this:

>>> tbl = Txtble(headers=HEADERS)
>>> for row in DATA:
...     tbl.append(row)

Or even like this:

>>> tbl = Txtble(DATA)
>>> tbl.headers = HEADERS

The number of columns is automatically set to the length of the longest row:

>>> tbl = Txtble([
...     ['1', '1'],
...     ['Z_6', '1', 'x', 'x^2', 'x^3', 'x^4', 'x^5'],
...     ['S_3', '1', 'a', 'b', 'aba', 'ba', 'ab'],
...     ['Z_4', '1', 'x', 'x^2', 'x^3'],
...     ['V_4', '1', 'a', 'b', 'ab'],
... ])
>>> print(tbl)
+---+-+-+---+---+---+---+
|1  |1| |   |   |   |   |
|Z_6|1|x|x^2|x^3|x^4|x^5|
|S_3|1|a|b  |aba|ba |ab |
|Z_4|1|x|x^2|x^3|   |   |
|V_4|1|a|b  |ab |   |   |
+---+-+-+---+---+---+---+

… unless you’ve specified a header row, which puts a limit on the number of columns:

>>> tbl.headers = ['Group', 'Elements']
>>> print(tbl)
+-----+--------+
|Group|Elements|
+-----+--------+
|1    |1       |
|Z_6  |1       |
|S_3  |1       |
|Z_4  |1       |
|V_4  |1       |
+-----+--------+

… unless you’ve also specified a header_fill to use as the the header for extra columns:

>>> tbl.header_fill = 'Extra!'
>>> print(tbl)
+-----+--------+------+------+------+------+------+
|Group|Elements|Extra!|Extra!|Extra!|Extra!|Extra!|
+-----+--------+------+------+------+------+------+
|1    |1       |      |      |      |      |      |
|Z_6  |1       |x     |x^2   |x^3   |x^4   |x^5   |
|S_3  |1       |a     |b     |aba   |ba    |ab    |
|Z_4  |1       |x     |x^2   |x^3   |      |      |
|V_4  |1       |a     |b     |ab    |      |      |
+-----+--------+------+------+------+------+------+

Unicode works too, even fullwidth characters and combining characters:

>>> tbl = Txtble(
...     headers=['Wide', 'Accented'],
...     data=[
...         [
...             u'\uFF37\uFF49\uFF44\uFF45',
...             u'A\u0301c\u0301c\u0301e\u0301n\u0301t\u0301e\u0301d\u0301',
...         ]
...     ]
... )
>>> print(tbl.show())
+--------+--------+
|Wide    |Accented|
+--------+--------+
|Ｗｉｄｅ|Áććéńt́éd́|
+--------+--------+

API

Txtble

Txtble(data=(), **kwargs)

Create a new Txtble object. The table’s data may be passed to the constructor as an iterable of iterables (rows) of values; otherwise, the data starts out empty. In either case, further data rows can be added via the append() and extend() methods.

**kwargs are used to configure the Txtble instance; see “Configuration Options” below.

tbl.append(row)

Add an iterable of values as a new data row at the bottom of the table

tbl.extend(rows)

Add an iterable of iterables of values as new data rows at the bottom of the table

tbl.show() or str(tbl)

Convert the Txtble instance to a string showing a plain text table. Table cells and filler values that are not already strings are converted by calling str() on them; the exceptions are None values, which are displayed according to the none_str option (see below). All tab characters are expanded to spaces before building the table. If any of the resulting strings have indeterminate width (i.e., if wcwidth.wcswidth() returns a negative number for any of them), an IndeterminateWidthError (a subclass of ValueError) is raised.

Note that the resulting string will likely contain one or more embedded newlines, but (outside of some very odd cases) it will not end with a newline. This means that you can do print(tbl) and there won’t be a blank line added at the end.

In Python 2, unicode(tbl) is like str(tbl), except it produces a unicode value. This is necessary if one or more table cells are unicode.

Configuration Options

These options can be set either as keywords passed to the Txtble constructor or as attributes on a Txtble instance:

tbl = Txtble(data, border=False)
# Same as:
tbl = Txtble(data)
tbl.border = False

align=()

A sequence of alignment specifiers indicating how the contents of each column, in order, should be horizontally aligned. The alignment specifiers are 'l' (left alignment), 'c' (centered alignment), and 'r' (right alignment). align may optionally be set to a single alignment specifier to cause all columns to be aligned in that way.

align_fill='l'

If there are more columns than there are entries in align, the extra columns will have their alignment set to align_fill.

border=True

Whether to draw a border around the edge of the table. border may optionally be set to a BorderStyle instance to set the characters used for drawing the border around the edge of the table.

border_style=ASCII_BORDERS

Sets the default characters used for drawing all of the table’s borders & rules. The border style can be overridden for individual borders by setting their respective options (border, column_border, etc.). See “BorderStyle” below for more information.

column_border=True

Whether to draw a vertical rule between individual columns. column_border may optionally be set to a BorderStyle instance to set the characters used for drawing the vertical rules between columns.

columns=None

An optional positive integer. When set, show exactly the given number of columns per row, adding cells with row_fill and discarding extra cells as needed. If headers is also set, its length must equal columns or else a ValueError is raised. Setting both columns and headers causes header_fill to be ignored.

header_border=None

Whether to draw a horizontal rule above the data rows, below the header row (if any). The default value of None means that the border will be drawn if & only if headers is non-None. header_border may optionally be set to a BorderStyle instance to set the characters used for drawing the horizontal rule above the data rows.

header_fill=None

When headers is non-None and columns is None, this option determines how rows with more columns than there are headers are handled. When header_fill=None, any extra columns are discarded from long rows. For all other values, the header row will be extended to the length of the longest data row, and the new header cells will contain the header_fill value.

headers=None

An optional list of cell values to display in a row at the top of the table. Setting this option also implicitly sets a minimum number of columns per row; see header_fill for allowing extra columns.

If headers is set to an empty list, header_fill must be set to a non-None value or else a ValueError will be raised upon trying to render the Txtble.

left_padding=None

Padding to insert on the left of every table cell. This can be either an integer (to insert that many space characters) or a string. If a string, it may not contain any newlines. left_padding overrides padding.

none_str=''

The string to display in place of None values (Setting none_str=None is the same as setting it to 'None')

padding=0

Padding to insert on the left & right of every table cell. This can be either an integer (to insert that many space characters) or a string. If a string, it may not contain any newlines.

right_padding=None

Padding to insert on the right of every table cell. This can be either an integer (to insert that many space characters) or a string. If a string, it may not contain any newlines. right_padding overrides padding.

row_border=False

Whether to draw horizontal rules between data rows. row_border may optionally be set to a BorderStyle instance to set the characters used for drawing the horizontal rules between data rows.

row_fill=''

If the rows of a table differ in number of columns, cells are added to the shorter rows until they all line up, and the added cells contain row_fill as their value.

rstrip=True

When border=False, setting rstrip=False will cause the last cell of each row to still be padded with trailing whitespace and padding in order to reach the full column width. (Normally, this whitespace and padding is omitted when border=False as there is no end-of-line border to align.) This option is useful if you wish to append text to one or more lines of the output and have it appear strictly outside the table.

BorderStyle

The BorderStyle class is a namedtuple listing the strings to use for drawing a table’s borders & rules. Its attributes are:

Attribute	Description	Example
hline	horizontal line	─
vline	vertical line	│
ulcorner	upper-left box corner	┌
urcorner	upper-right box corner	┐
llcorner	lower-left box corner	└
lrcorner	lower-right box corner	┘
vrtee	tee pointing right	├
vltee	tee pointing left	┤
dhtee	tee pointing down	┬
uhtee	tee pointing up	┴
plus	cross/four-way joint	┼

txtble provides the following predefined BorderStyle instances:

ASCII_BORDERS

The default border style. Draws borders using only the ASCII characters -, |, and +:

+-+-+
|A|B|
+-+-+
|C|D|
+-+-+

ASCII_EQ_BORDERS

Like ASCII_BORDERS, but uses = in place of -:

+=+=+
|A|B|
+=+=+
|C|D|
+=+=+

LIGHT_BORDERS

Uses the light box drawing characters:

┌─┬─┐
|A|B|
├─┼─┤
|C|D|
└─┴─┘

HEAVY_BORDERS

Uses the heavy box drawing characters:

┏━┳━┓
┃A┃B┃
┣━╋━┫
┃C┃D┃
┗━┻━┛

DOUBLE_BORDERS

Uses the double box drawing characters:

╔═╦═╗
║A║B║
╠═╬═╣
║C║D║
╚═╩═╝

DOT_BORDERS

Uses ⋯, ⋮, and ·:

·⋯·⋯·
⋮A⋮B⋮
·⋯·⋯·
⋮C⋮D⋮
·⋯·⋯·

If you define your own custom instances of BorderStyle, they must adhere to the following rules:

• The hline string must be exactly one terminal column wide (the same width as a space character).

• All strings other than hline must be the same width.

• No string may contain a newline.

Unicode in Python 2

The following guarantees are made regarding txtble’s handling of Unicode in the fragile twilight realm that is Python 2:

• If all table elements (table cells, *_fill options, none_str, border style strings, etc.) are or stringify to ASCII-only str values, calling str(tbl) will work, and tbl.show() will return a str.

• If one or more table elements are unicode and all other cell values are or stringify to ASCII-only str values, calling unicode(tbl) will work, and tbl.show() will return a unicode.

In all other cases, you’re on your own.