python 打印表单格式

Headers

The second optional argument named headers defines a list ofcolumn headers to be used:

>>> print tabulate(table, headers=["Planet","R (km)", "mass (x 10^29 kg)"])
Planet      R (km)    mass (x 10^29 kg)
--------  --------  -------------------
Sun         696000           1.9891e+09
Earth         6371        5973.6
Moon          1737          73.5
Mars          3390         641.85

If headers="firstrow", then the first row of data is used:

>>> print tabulate([["Name","Age"],["Alice",24],["Bob",19]],
...                headers="firstrow")
Name      Age
------  -----
Alice      24
Bob        19

If headers="keys", then the keys of a dictionary/dataframe,or column indices are used:

>>> print tabulate({"Name": ["Alice", "Bob"],
...                 "Age": [24, 19]}, headers="keys")
  Age  Name
-----  ------
   24  Alice
   19  Bob

Table format

There is more than one way to format a table in plain text.The third optional argument namedtablefmt defineshow the table is formatted.

Supported table formats are:

• "plain"
• "simple"
• "grid"
• "pipe"
• "orgtbl"
• "rst"
• "mediawiki"

plain tables do not use any pseudo-graphics to draw lines:

>>> table = [["spam",42],["eggs",451],["bacon",0]]
>>> headers = ["item", "Qty"]
>>> print tabulate(table, headers, tablefmt="plain")
item      qty
spam       42
eggs      451
bacon       0

simple is the default format (the default may change in futureversions). It corresponds tosimple_tables in Pandoc markdownextensions:

>>> print tabulate(table, headers, tablefmt="simple")
item      qty
------  -----
spam       42
eggs      451
bacon       0

grid is like tables formatted by EMacs' table.elpackage. It corresponds to grid_tables in Pandoc Markdownextensions:

>>> print tabulate(table, headers, tablefmt="grid")
+--------+-------+
| item   |   qty |
+========+=======+
| spam   |    42 |
+--------+-------+
| eggs   |   451 |
+--------+-------+
| bacon  |     0 |
+--------+-------+

pipe follows the conventions of PHP Markdown Extra extension. Itcorresponds topipe_tables in Pandoc. This format uses colons toindicate column alignment:

>>> print tabulate(table, headers, tablefmt="pipe")
| item   |   qty |
|:-------|------:|
| spam   |    42 |
| eggs   |   451 |
| bacon  |     0 |

orgtbl follows the conventions of Emacs org-mode, and is editablealso in the minor orgtbl-mode. Hence its name:

>>> print tabulate(table, headers, tablefmt="orgtbl")
| item   |   qty |
|--------+-------|
| spam   |    42 |
| eggs   |   451 |
| bacon  |     0 |

rst formats data like a simple table of the reStructuredText format:

>>> print tabulate(table, headers, tablefmt="rst")
======  =====
item      qty
======  =====
spam       42
eggs      451
bacon       0
======  =====

mediawiki format produces a table markup used inWikipedia and onother MediaWiki-based sites:

>>> print tabulate(table, headers, tablefmt="mediawiki")
{| class="wikitable" style="text-align: left;"
|+ <!-- caption -->
|-
! item   !! align="right"|   qty
|-
| spam   || align="right"|    42
|-
| eggs   || align="right"|   451
|-
| bacon  || align="right"|     0
|}

Column alignment

tabulate is smart about column alignment. It detects columns whichcontain only numbers, and aligns them by a decimal point (or flushesthem to the right if they appear to be integers). Text columns areflushed to the left.

You can override the default alignment with numalign andstralign named arguments. Possible column alignments are:right,center,left, decimal (only for numbers).

Aligning by a decimal point works best when you need to comparenumbers at a glance:

>>> print tabulate([[1.2345],[123.45],[12.345],[12345],[1234.5]])
----------
    1.2345
  123.45
   12.345
12345
 1234.5
----------

Compare this with a more common right alignment:

>>> print tabulate([[1.2345],[123.45],[12.345],[12345],[1234.5]], numalign="right")
------
1.2345
123.45
12.345
 12345
1234.5
------

For tabulate, anything which can be parsed as a number is anumber. Even numbers represented as strings are aligned properly. Thisfeature comes in handy when reading a mixed table of text and numbersfrom a file:

>>> import csv ; from StringIO import StringIO
>>> table = list(csv.reader(StringIO("spam, 42\neggs, 451\n")))
>>> table
[['spam', ' 42'], ['eggs', ' 451']]
>>> print tabulate(table)
----  ----
spam    42
eggs   451
----  ----

Number formatting

tabulate allows to define custom number formatting applied to allcolumns of decimal numbers. Usefloatfmt named argument:

>>> print tabulate([["pi",3.141593],["e",2.718282]], floatfmt=".4f")
--  ------
pi  3.1416
e   2.7183
--  ------