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A set of row-operations for CSV files.

Project description

This module provides a set of simple utilities for retrieving, manipulating and updating data organized in rows and contained in a CSV file.

The source code for this module lives at:

https://github.com/thumbo/CSVrope

Please report any bugs or feature requests via the issue tracker there.

INSTALLATION DEPENDENCIES

The algorithms should work with Python 3.5 or later and require a few open source Python modules. Below are the dependencies required for the toolset with the versions with which the algorithm was tested:

  • Python 3.5

  • Nose 1.3.7

INSTALLATION

This module is registered with the Python package index.

The easiest way to install the package is to use pip. First make sure that your version of pip is up to date:

https://pip.pypa.io/en/stable/installing/#upgrading-pip

… and then run the command:

pip install csvrope

For additional information about how to use pip, please refer to the guide:

https://packaging.python.org/installing/#use-pip-for-installing

In alternative you can also download the package from:

http://pypi.python.org/pypi/csvrope

… and compile it in the usual way:

$ python setup.py install

USAGE

The csvrope module contains a set of basic functions to be used in retrieving, updating and manipulating data contained in a CSV file.

The csvrope module gives its best when the data contained in the CSV file is organized in a “table” form, as in the following example:

a01, Mark, 22,male, yes, 126

a02, Jane, 31,female, yes, 152

a03, Philip, 28,male, no, 88

a04, John, 19,male, yes, 115

Value 0

Value 1

Value 2

Value 3

Value 4

Value 5

Row 0

a01

Mark

22

male

yes

126

Row 1

a02

Jane

31

female

yes

152

Row 2

a03

Philip

28

male

no

88

Row 3

a04

John

19

male

yes

115

Row 4

In order to use the following functions, it is sufficient to import the module within your script.

FUNCTIONS:

append_row(filename, row)

Append a row at the end of CSV file.

clear(filename)

Clear the CSV file.

count_rows(filename)

Return the number of rows present in the CSV file, 0 if none.

get_row(filename, row_index)

Return the row at row_index, from zero-index.

get_row_value(filename, row_index, value_index)

Return the value at value_index from the row at row_index, from zero-index.

get_row_values(filename, row_index, values_indexes)

Return the values at value_indexes from the row at row_index, from zero-index.

get_rows(filename)

Return a list containing all the rows of the CSV file.

get_rows_value(filename, value_index)

Return all the values at value_index from each row, from zero-index.

get_rows_with_value(filename, value_index, value_target)

Return a list containing all the rows that have value_target at value_index, from zero-index.

get_rows_with_values(filename, targets)

Return a list of lists, each containing the rows that match the targets, from zero-index.

Targets: [ [value1_index, value1_target], [value2_index, value2_target], … ]

Output: [ [rows with value1 ], [rows with value2], … ]

overwrite_row(filename, row_index, new_row)

Overwrite the row at row_index with the new_row, from zero-index.

print_rows(filename)

Print all the rows contained in the CSV file.

write_row(filename, row)

Clear the CSV file and write a single row.

For an account of the functionalities available from this module, see the tests.py module in the source code repository.

NOTES

The csvrope module is intended to be used in combination with the standard Python csv module.

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