pyexcel-io 0.5.7

A python library to read and write structured data in csv, zipped csvformat and to/from databases

Support the project

If your company has embedded pyexcel and its components into a revenue generating product, please support me on patreon or bounty source to maintain the project and develop it further.

If you are an individual, you are welcome to support me too and for however long you feel like. As my backer, you will receive early access to pyexcel related contents.

And your issues will get prioritized if you would like to become my patreon as pyexcel pro user.

With your financial support, I will be able to invest a little bit more time in coding, documentation and writing interesting posts.

Known constraints

Fonts, colors and charts are not supported.

Introduction

pyexcel-io provides one application programming interface(API) to read and write the data in excel format, import the data into and export the data from database. It provides support for csv(z) format, django database and sqlalchemy supported databases. Its supported file formats are extended to cover “xls”, “xlsx”, “ods” by the following extensions:

A list of file formats supported by external plugins

Package name	Supported file formats	Dependencies	Python versions
pyexcel-io	csv, csvz [1], tsv, tsvz [2]		2.6, 2.7, 3.3, 3.4, 3.5, 3.6 pypy
pyexcel-xls	xls, xlsx(read only), xlsm(read only)	xlrd, xlwt	same as above
pyexcel-xlsx	xlsx	openpyxl	same as above
pyexcel-ods3	ods	pyexcel-ezodf, lxml	2.6, 2.7, 3.3, 3.4 3.5, 3.6
pyexcel-ods	ods	odfpy	same as above

Dedicated file reader and writers

Package name	Supported file formats	Dependencies	Python versions
pyexcel-xlsxw	xlsx(write only)	XlsxWriter	Python 2 and 3
pyexcel-xlsxr	xlsx(read only)	lxml	same as above
pyexcel-odsr	read only for ods, fods	lxml	same as above
pyexcel-htmlr	html(read only)	lxml,html5lib	same as above

In order to manage the list of plugins installed, you need to use pip to add or remove a plugin. When you use virtualenv, you can have different plugins per virtual environment. In the situation where you have multiple plugins that does the same thing in your environment, you need to tell pyexcel which plugin to use per function call. For example, pyexcel-ods and pyexcel-odsr, and you want to get_array to use pyexcel-odsr. You need to append get_array(…, library=’pyexcel-odsr’).

Footnotes

[1]	zipped csv file

[2]	zipped tsv file

If you need to manipulate the data, you might do it yourself or use its brother library pyexcel .

If you would like to extend it, you may use it to write your own extension to handle a specific file format.

Installation

You can install pyexcel-io via pip:

$ pip install pyexcel-io

or clone it and install it:

$ git clone https://github.com/pyexcel/pyexcel-io.git
$ cd pyexcel-io
$ python setup.py install

Development guide

Development steps for code changes

1. git clone https://github.com/pyexcel/pyexcel-io.git
2. cd pyexcel-io

Upgrade your setup tools and pip. They are needed for development and testing only:

1. pip install –upgrade setuptools pip

Then install relevant development requirements:

1. pip install -r rnd_requirements.txt # if such a file exists
2. pip install -r requirements.txt
3. pip install -r tests/requirements.txt

Once you have finished your changes, please provide test case(s), relevant documentation and update CHANGELOG.rst.

Note

As to rnd_requirements.txt, usually, it is created when a dependent library is not released. Once the dependecy is installed (will be released), the future version of the dependency in the requirements.txt will be valid.

How to test your contribution

Although nose and doctest are both used in code testing, it is adviable that unit tests are put in tests. doctest is incorporated only to make sure the code examples in documentation remain valid across different development releases.

On Linux/Unix systems, please launch your tests like this:

$ make

On Windows systems, please issue this command:

> test.bat

How to update test environment and update documentation

Additional steps are required:

1. pip install moban
2. git clone https://github.com/moremoban/setupmobans.git # generic setup
3. git clone https://github.com/pyexcel/pyexcel-commons.git commons
4. make your changes in .moban.d directory, then issue command moban

What is pyexcel-commons

Many information that are shared across pyexcel projects, such as: this developer guide, license info, etc. are stored in pyexcel-commons project.

What is .moban.d

.moban.d stores the specific meta data for the library.

Acceptance criteria

1. Has Test cases written
2. Has all code lines tested
3. Passes all Travis CI builds
4. Has fair amount of documentation if your change is complex
5. Please update CHANGELOG.rst
6. Please add yourself to CONTRIBUTORS.rst
7. Agree on NEW BSD License for your contribution

License

New BSD License

Change log

0.5.7 - 02.05.2018

fixed

1. #48, turn off pep 0515
2. #47, csv reader cannot handle relative file names

0.5.6 - 11.01.2018

fixed

1. #46, expose bulk_save to developer

0.5.5 - 23.12.2017

fixed

1. Issue #45, csv reader throws exception because google app engine does not support mmap. People who are not working with google app engine, need not to take this update. Enjoy your Christmas break.

0.5.4 - 10.11.2017

updated

1. PR #44, use unicodewriter for csvz writers.

0.5.3 - 23.10.2017

updated

1. pyexcel pyexcel#105, remove gease from setup_requires, introduced by 0.5.2.
2. remove python2.6 test support

0.5.2 - 20.10.2017

added

1. pyexcel#103, include LICENSE file in MANIFEST.in, meaning LICENSE file will appear in the released tar ball.

0.5.1 - 02.09.2017

Fixed

1. pyexcel-ods#25, Unwanted dependency on pyexcel.

0.5.0 - 30.08.2017

Added

1. Collect all data type conversion codes as service.py.

Updated

1. #19, use cString by default. For python, it will be a performance boost

0.4.4 - 08.08.2017

Updated

1. #42, raise exception if database table name does not match the sheet name

0.4.3 - 29.07.2017

Updated

1. #41, walk away gracefully when mmap is not available.

0.4.2 - 05.07.2017

Updated

1. #37, permanently fix the residue folder pyexcel by release all future releases in a clean clone.

0.4.1 - 29.06.2017

Updated

1. #39, raise exception when bulk save in django fails. Please bulk_save=False if you as the developer choose to save the records one by one if bulk_save cannot be used. However, exception in one-by-one save case will be raised as well. This change is made to raise exception in the first place so that you as the developer will be suprised when it was deployed in production.

0.4.0 - 19.06.2017

Updated

1. ‘built-in’ as the value to the parameter ‘library’ as parameter to invoke pyexcel-io’s built-in csv, tsv, csvz, tsvz, django and sql won’t work. It is renamed to ‘pyexcel-io’.
2. built-in csv, tsv, csvz, tsvz, django and sql are lazy loaded.
3. pyexcel-io plugin interface has been updated. v0.3.x plugins won’t work.
4. #32, csv and csvz file handle are made sure to be closed. File close mechanism is enfored.
5. iget_data function is introduced to cope with dangling file handle issue.

Removed

1. Removed plugin loading code and lml is used instead

0.3.4 - 18.05.2017

Updated

1. #33, handle mmap object differently given as file content. This issue has put in a priority to single sheet csv over multiple sheets in a single memory stream. The latter format is pyexcel own creation but is rarely used. In latter case, multiple_sheet=True should be passed along get_data.
2. #34, treat mmap object as a file content.
3. #35, encoding parameter take no effect when given along with file content
4. use ZIP_DEFALTED to really do the compression

0.3.3 - 30.03.2017

Updated

1. #31, support pyinstaller

0.3.2 - 26.01.2017

Updated

1. #29, change skip_empty_rows to False by default

0.3.1 - 21.01.2017

Added

1. updated versions of extra packages

Updated

1. #23, provide helpful message when old pyexcel plugin exists
2. restored previously available diagnosis message for missing libraries

0.3.0 - 22.12.2016

Added

1. lazy loading of plugins. for example, pyexcel-xls is not entirely loaded until xls format is used at its first attempted reading or writing. Since it is loaded, it will not be loaded in the second io action.
2. pyexcel-xls#11, make case-insensitive for file type

0.2.6 - 21.12.2016

Updated

1. #24, pass on batch_size

0.2.5 - 20.12.2016

Updated

1. #26, performance issue with getting the number of columns.

0.2.4 - 24.11.2016

Updated

1. #23, Failed to convert long integer string in python 2 to its actual value

0.2.3 - 16.09.2016

Added

1. #21, choose subset from data base tables for export
2. #22, custom renderer if given row_renderer as parameter.

0.2.2 - 31.08.2016

Added

1. support pagination. two pairs: start_row, row_limit and start_column, column_limit help you deal with large files.
2. skip_empty_rows=True was introduced. To include empty rows, put it to False.

Updated

1. #20, pyexcel-io attempts to parse cell contents of ‘infinity’ as a float/int, crashes

0.2.1 - 11.07.2016

Added

1. csv format: handle utf-16 encoded csv files. Potentially being able to decode other formats if correct “encoding” is provided
2. csv format: write utf-16 encoded files. Potentially other encoding is also supported
3. support stdin as input stream and stdout as output stream

Updated

1. Attention, user of pyexcel-io! No longer io stream validation is performed in python 3. The guideline is: io.StringIO for csv, tsv only, otherwise BytesIO for xlsx, xls, ods. You can use RWManager.get_io to produce a correct stream type for you.
2. #15, support foreign django/sql foreign key

0.2.0 - 01.06.2016

Added

1. autoload of pyexcel-io plugins
2. auto detect datetime, float and int. Detection can be switched off by auto_detect_datetime, auto_detect_float, auto_detect_int

0.1.0 - 17.01.2016

Added

1. yield key word to return generator as content