humanfriendly: Human friendly input/output in Python

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The functions and classes in the humanfriendly package can be used to make text interfaces more user friendly. Some example features:

• Parsing and formatting numbers, file sizes, pathnames and timespans in simple, human friendly formats.

• Easy to use timers for long running operations, with human friendly formatting of the resulting timespans.

• Prompting the user to select a choice from a list of options by typing the option's number or a unique substring of the option.

• Terminal interaction including text styling (ANSI escape sequences_), user friendly rendering of usage messages and querying the terminal for its size.

The humanfriendly package is currently tested on Python 2.7, 3.5+ and PyPy (2.7) on Linux and macOS. While the intention is to support Windows as well, you may encounter some rough edges.

.. contents:: :local:

Getting started

It's very simple to start using the humanfriendly package::

from humanfriendly import format_size, parse_size from humanfriendly.prompts import prompt_for_input user_input = prompt_for_input("Enter a readable file size: ")

 Enter a readable file size: 16G

num_bytes = parse_size(user_input) print(num_bytes) 16000000000 print("You entered:", format_size(num_bytes)) You entered: 16 GB print("You entered:", format_size(num_bytes, binary=True)) You entered: 14.9 GiB

To get a demonstration of supported terminal text styles (based on ANSI escape sequences_) you can run the following command::

$ humanfriendly --demo

Command line

.. A DRY solution to avoid duplication of the `humanfriendly --help' text: .. .. [[[cog .. from humanfriendly.usage import inject_usage .. inject_usage('humanfriendly.cli') .. ]]]

Usage: humanfriendly [OPTIONS]

Human friendly input/output (text formatting) on the command line based on the Python package with the same name.

Supported options:

.. csv-table:: :header: Option, Description :widths: 30, 70

"-c, --run-command","Execute an external command (given as the positional arguments) and render a spinner and timer while the command is running. The exit status of the command is propagated." --format-table,"Read tabular data from standard input (each line is a row and each whitespace separated field is a column), format the data as a table and print the resulting table to standard output. See also the --delimiter option." "-d, --delimiter=VALUE","Change the delimiter used by --format-table to VALUE (a string). By default all whitespace is treated as a delimiter." "-l, --format-length=LENGTH","Convert a length count (given as the integer or float LENGTH) into a human readable string and print that string to standard output." "-n, --format-number=VALUE","Format a number (given as the integer or floating point number VALUE) with thousands separators and two decimal places (if needed) and print the formatted number to standard output." "-s, --format-size=BYTES","Convert a byte count (given as the integer BYTES) into a human readable string and print that string to standard output." "-b, --binary","Change the output of -s, --format-size to use binary multiples of bytes (base-2) instead of the default decimal multiples of bytes (base-10)." "-t, --format-timespan=SECONDS","Convert a number of seconds (given as the floating point number SECONDS) into a human readable timespan and print that string to standard output." --parse-length=VALUE,"Parse a human readable length (given as the string VALUE) and print the number of metres to standard output." --parse-size=VALUE,"Parse a human readable data size (given as the string VALUE) and print the number of bytes to standard output." --demo,"Demonstrate changing the style and color of the terminal font using ANSI escape sequences." "-h, --help",Show this message and exit.

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A note about size units

When I originally published the humanfriendly package I went with binary multiples of bytes (powers of two). It was pointed out several times that this was a poor choice (see issue #4_ and pull requests #8_ and #9_) and thus the new default became decimal multiples of bytes (powers of ten):

+------+---------------+---------------+ | Unit | Binary value | Decimal value | +------+---------------+---------------+ | KB | 1024 | 1000 + +------+---------------+---------------+ | MB | 1048576 | 1000000 | +------+---------------+---------------+ | GB | 1073741824 | 1000000000 | +------+---------------+---------------+ | TB | 1099511627776 | 1000000000000 | +------+---------------+---------------+ | etc | | | +------+---------------+---------------+

The option to use binary multiples of bytes remains by passing the keyword argument binary=True to the format_size()_ and parse_size()_ functions.

Windows support

Windows 10 gained native support for ANSI escape sequences which means commands like humanfriendly --demo should work out of the box (if your system is up-to-date enough). If this doesn't work then you can install the colorama_ package, it will be used automatically once installed.

Contact

The latest version of humanfriendly is available on PyPI_ and GitHub_. The documentation is hosted on Read the Docs_ and includes a changelog_. For bug reports please create an issue on GitHub_. If you have questions, suggestions, etc. feel free to send me an e-mail at [email protected]_.

License

This software is licensed under the MIT license_.

© 2021 Peter Odding.

.. External references: .. _#4: https://github.com/xolox/python-humanfriendly/issues/4 .. _#8: https://github.com/xolox/python-humanfriendly/pull/8 .. _#9: https://github.com/xolox/python-humanfriendly/pull/9 .. _ANSI escape sequences: https://en.wikipedia.org/wiki/ANSI_escape_code .. _changelog: https://humanfriendly.readthedocs.io/en/latest/changelog.html .. _colorama: https://pypi.org/project/colorama .. _format_size(): https://humanfriendly.readthedocs.io/en/latest/#humanfriendly.format_size .. _GitHub: https://github.com/xolox/python-humanfriendly .. _MIT license: https://en.wikipedia.org/wiki/MIT_License .. _parse_size(): https://humanfriendly.readthedocs.io/en/latest/#humanfriendly.parse_size .. [email protected]: [email protected] .. _PyPI: https://pypi.org/project/humanfriendly .. _Read the Docs: https://humanfriendly.readthedocs.io