reusables 0.5.1

Commonly Consumed Code Commodities

Commonly Consumed Code Commodities

Overview

The reusables library is a reference of python functions and classes that programmers may find themselves often recreating.

It includes:

• Cookie Management for Firefox and Chrome

• Archive extraction (zip, tar, rar)

• Path (file and folders) management

• Fast logging setup

• Namespace (dict to class modules with child recursion)

• Friendly datetime formatting

• Config to dict parsing

• Common regular expressions and file extensions

• Unique function wrappers

Reusables is designed to not require any imports outside the standard library, but can be supplemented with those found in the requirements.txt file for additional functionality.

CI tests run on:

• Python 2.6+

• Python 3.3+

• Pypy

Examples are provided below, and the API documentation can always be found at readthedocs.org.

What’s in the box

General Helpers and File Management

import reusables

reusables.extract_all("test/test_structure.zip", "my_archive")
# All files in the zip will be extracted into directory "my_archive"

reusables.config_dict('my_config.cfg')
# {'Section 1': {'key 1': 'value 1', 'key2': 'Value2'}, 'Section 2': {}}

reusables.find_all_files(".", ext=reusables.exts.pictures)
# ['/home/user/background.jpg', '/home/user/private.png']

reusables.count_all_files(".")
# 405

reusables.file_hash("test_structure.zip", hash_type="sha256")
# 'bc11af55928ab89771b9a141fa526a5b8a3dbc7d6870fece9b91af5d345a75ea'

reusables.safe_path('/home/user/eViL User\0\\/newdir$^&*/new^%file.txt')
# '/home/user/eViL User__/newdir____/new__file.txt'

Cookie Management

Firefox and Chrome Cookie management. (Chrome requires SQLite 3.8 or greater.)

fox = reusables.FirefoxCookies()
# Automatically uses the DB of the default profile, can specify db=<path>

fox.add_cookie("example.com", "MyCookie", "Cookie contents!")

fox.find_cookies(host="Example")
# [{'host': u'example.com', 'name': u'MyCookie', 'value': u'Cookie contents!'}]

fox.delete_cookie("example.com", "MyCookie")

Namespace

Dictionary management class, similar to Bunch, but designed so that sub-dictionaries are recursively made into namespaces.

my_breakfast = {"spam": {"eggs": {"sausage": {"bacon": "yummy"}}}}
namespace_breakfast = reusables.Namespace(**my_breakfast)

print(namespace_breakfast.spam.eggs.sausage.bacon)
# yummy

print(namespace_breakfast.spam.eggs['sausage'].bacon)
# yummy

str(namespace_breakfast['spam'].eggs)
# "{'sausage': {'bacon': 'yummy'}}"

namespace_breakfast.to_dict()
#{'spam': {'eggs': {'sausage': {'bacon': 'yummy'}}}}

dict(namespace_breakfast)
# {'spam': <Namespace: {'eggs': {'sausage': {'bacon': '...>}
# This is NOT the same as .to_dict() as it is not recursive

DateTime

Easy formatting for datetime objects. It also adds auto parsing for ISO formatted time.

current_time = reusables.DateTime() # same as datetime.datetime.now(), as DateTime object

current_time.format("Wake up {son}, it's {hours}:{minutes} {periods}!"
                    "I don't care if it's a {day-fullname}, {command}!",
                    son="John",
                    command="Get out of bed!")
# "Wake up John, it's 09:51 AM! I don't care if it's a Saturday, Get out of bed!!"

Examples based on Mon Mar 28 13:27:11 2016

Format	Mapping	Example
{12-hour}	%I	01
{24-hour}	%H	13
{seconds}	%S	14
{minutes}	%M	20
{microseconds}	%f	320944
{time-zone}	%Z
{years}	%y	16
{years-full}	%Y	2016
{months}	%m	03
{months-name}	%b	Mar
{months-full}	%B	March
{days}	%d	28
{week-days}	%w	1
{year-days}	%j	088
{days-name}	%a	Mon
{days-full}	%A	Monday
{mon-weeks}	%W	13
{date}	%x	03/28/16
{time}	%X	13:27:11
{date-time}	%C	Mon Mar 28 13:27:11 2016
{utc-offset}	%Z
{periods}	%p	PM
{iso-format}	%Y-%m-%dT%H:%M:%S	2016-03-28T13:27:11

Logging

logger = reusables.get_logger(__name__)
# By default it adds a stream logger to sys.stderr

logger.info("Test")
# 2016-04-25 19:32:45,542 __main__     INFO     Test

There are multiple log formatters provided, as well as additional helper functions

reusables.remove_stream_handlers(logger)
# remove_file_handlers() and remove_all_handlers() also available

stream_handler = reusables.get_stream_handler(log_format=reusables.log_detailed_format)
logger.addHandler(stream_handler)
logger.info("Example log entry")
# 2016-04-25 19:42:52,633 : 315147 MainThread : reusables.log INFO Example log entry

Because ReStructuredText tables don’t preserve whitespace (even with literals), which is important to show distinction in these formatters, here’s it in a code block instead.

+------------------------+--------------------------------------------------------------------------------------+
| Formatter              | Example Output                                                                       |
+========================+======================================================================================+
| log_easy_read_format   | 2016-04-26 21:17:51,225 - example_logger  INFO      example log message              |
|                        | 2016-04-26 21:17:59,074 - example_logger  ERROR     Something broke                  |
+------------------------+--------------------------------------------------------------------------------------+
| log_detailed_format    | 2016-04-26 21:17:51,225 :  7020 MainThread : example_logger INFO example log message |
|                        | 2016-04-26 21:17:59,074 : 14868 MainThread : example_logger ERROR Something broke    |
+------------------------+--------------------------------------------------------------------------------------+
| log_level_first_format | INFO - example_logger - 2016-04-26 21:17:51,225 - example log message                |
|                        | ERROR - example_logger - 2016-04-26 21:17:59,074 - Something broke                   |
+------------------------+--------------------------------------------------------------------------------------+
| log_threaded_format    | 7020 MainThread : example log message                                                |
|                        | 14868 MainThread : Something broke                                                   |
+------------------------+--------------------------------------------------------------------------------------+
| log_easy_thread_format |  7020 MainThread : example_logger  INFO      example log message                     |
|                        | 14868 MainThread : example_logger  ERROR     Something broke                         |
+------------------------+--------------------------------------------------------------------------------------+
| log_common_format      | 2016-04-26 21:17:51,225 - example_logger - INFO - example log message                |
|                        | 2016-04-26 21:17:59,074 - example_logger - ERROR - Something broke                   |
+------------------------+--------------------------------------------------------------------------------------+

Extension Groups

It’s common to be looking for a specific type of file.

if file_path.endswith(reusables.exts.pictures):
    print("{} is a picture file".format(file_path))

That’s right, str.endswith (as well as str.startswith) accept a tuple to search.

File Type	Extensions
pictures	.jpeg .jpg .png .gif .bmp .tif .tiff .ico .mng .tga .psd .xcf .svg .icns
video	.mkv .avi .mp4 .mov .flv .mpeg .mpg .3gp .m4v .ogv .asf .m1v .m2v .mpe .ogv .wmv .rm .qt
music	.mp3 .ogg .wav .flac .aif .aiff .au .m4a .wma .mp2 .m4a .m4p .aac .ra .mid .midi .mus .psf
documents	.doc .docx .pdf .xls .xlsx .ppt .pptx .csv .epub .gdoc .odt .rtf .txt .info .xps .gslides .gsheet
archives	.zip .rar .7z .tar.gz .tgz .gz .bzip .bzip2 .bz2 .xz .lzma .bin .tar
cd_images	.iso .nrg .img .mds .mdf .cue .daa

Wrappers

There are tons of wrappers for caching and saving inputs and outputs, this is a different take that requires the function returns a result not yet provided.

@reusables.unique(max_retries=100, error_text="All UIDs taken!")
def gen_small_uid():
    import random
    return random.randint(0, 100)

Common Issues

UnRAR path issues

A common error to see, especially on Windows based systems, is: “rarfile.RarCannotExec: Unrar not installed? (rarfile.UNRAR_TOOL=’unrar’)”

This is probably because unrar is not downloaded or linked properly. Download UnRAR from http://www.rarlab.com/rar_add.htm and follow these instructions before trying again: http://rarfile.readthedocs.org/en/latest/faq.html?highlight=windows#how-can-i-get-it-work-on-windows

License

The MIT License (MIT)

Copyright (c) 2014-2016 Chris Griffith

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Additional Info

This does not claim to provide the most accurate, fastest or most ‘pythonic’ way to implement these useful snippets, this is simply designed for easy reference. Any contributions that would help add functionality or improve existing code is warmly welcomed!