A nifty data processing framework, based on data packages
Project description
DataFlows
DataFlows is a simple and intuitive way of building data processing flows.
- It's built for small-to-medium-data processing - data that fits on your hard drive, but is too big to load in Excel or as-is into Python, and not big enough to require spinning up a Hadoop cluster...
- It's built upon the foundation of the Frictionless Data project - which means that all data produced by these flows is easily reusable by others.
- It's a pattern not a heavy-weight framework: if you already have a bunch of download and extract scripts this will be a natural fit
Read more in the Features section below.
QuickStart
Install dataflows via pip install.
Then use the command-line interface to bootstrap a basic processing script for any remote data file:
# Install from PyPi
$ pip install dataflows
# Inspect a remote CSV file
$ dataflows init https://raw.githubusercontent.com/datahq/dataflows/master/data/academy.csv
Writing processing code into academy_csv.py
Running academy_csv.py
academy:
# Year Ceremony Award Winner Name Film
(string) (integer) (string) (string) (string) (string)
---- ---------- ----------- -------------------------------- ---------- ------------------------------ -------------------
1 1927/1928 1 Actor Richard Barthelmess The Noose
2 1927/1928 1 Actor 1 Emil Jannings The Last Command
3 1927/1928 1 Actress Louise Dresser A Ship Comes In
4 1927/1928 1 Actress 1 Janet Gaynor 7th Heaven
5 1927/1928 1 Actress Gloria Swanson Sadie Thompson
6 1927/1928 1 Art Direction Rochus Gliese Sunrise
7 1927/1928 1 Art Direction 1 William Cameron Menzies The Dove; Tempest
...
# dataflows create a local package of the data and a reusable processing script which you can tinker with
$ tree
.
├── academy_csv
│ ├── academy.csv
│ └── datapackage.json
└── academy_csv.py
1 directory, 3 files
# Resulting 'Data Package' is super easy to use in Python
[adam] ~/code/budgetkey-apps/budgetkey-app-main-page/tmp (master=) $ python
Python 3.6.1 (default, Mar 27 2017, 00:25:54)
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.42.1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from datapackage import Package
>>> pkg = Package('academy_csv/datapackage.json')
>>> it = pkg.resources[0].iter(keyed=True)
>>> next(it)
{'Year': '1927/1928', 'Ceremony': 1, 'Award': 'Actor', 'Winner': None, 'Name': 'Richard Barthelmess', 'Film': 'The Noose'}
>>> next(it)
{'Year': '1927/1928', 'Ceremony': 1, 'Award': 'Actor', 'Winner': '1', 'Name': 'Emil Jannings', 'Film': 'The Last Command'}
# You now run `academy_csv.py` to repeat the process
# And obviously modify it to add data modification steps
Features
- Trivial to get started and easy to scale up
- Set up and run from command line in seconds ...
dataflow init=>flow.pypython flow.py
- Validate input (and esp source) quickly (non-zero length, right structure, etc.)
- Supports caching data from source and even between steps
- so that we can run and test quickly (retrieving is slow)
- Immediate test is run: and look at output ...
- Log, debug, rerun
- Degrades to simple python
- Conventions over configuration
- Log exceptions and / or terminate
- The input to each stage is a Data Package or Data Resource (not a previous task)
- Data package based and compatible
- Processors can be a function (or a class) processing row-by-row, resource-by-resource or a full package
- A pre-existing decent contrib library of Readers (Collectors) and Processors and Writers
Learn more
Dive into the Tutorial to get a deeper glimpse into everything that dataflows can do.
Also review this list of Built-in Processors, which also includes an API reference for each one of them.
Release history Release notifications | RSS feed
Download files
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.
Source Distribution
dataflows-0.0.58.tar.gz
(32.0 kB
view details)
Built Distribution
File details
Details for the file dataflows-0.0.58.tar.gz.
File metadata
- Download URL: dataflows-0.0.58.tar.gz
- Upload date:
- Size: 32.0 kB
- Tags: Source
- Uploaded using Trusted Publishing? No
- Uploaded via: twine/1.13.0 pkginfo/1.5.0.1 requests/2.20.1 setuptools/41.0.1 requests-toolbelt/0.9.1 tqdm/4.31.1 CPython/3.7.0
File hashes
| Algorithm | Hash digest | |
|---|---|---|
| SHA256 | 2e21842b13d0ef63aa2cb408d4faef3463195c63aaf232b6612c5c26416f9c7d |
|
| MD5 | 096cab52b0da6c5dc03e1f9371288051 |
|
| BLAKE2b-256 | d9a896eb9726fc33bd4742f11389d07d2188c636894c045423f95cd26ced08ec |
Provenance
File details
Details for the file dataflows-0.0.58-py2.py3-none-any.whl.
File metadata
- Download URL: dataflows-0.0.58-py2.py3-none-any.whl
- Upload date:
- Size: 44.5 kB
- Tags: Python 2, Python 3
- Uploaded using Trusted Publishing? No
- Uploaded via: twine/1.13.0 pkginfo/1.5.0.1 requests/2.20.1 setuptools/41.0.1 requests-toolbelt/0.9.1 tqdm/4.31.1 CPython/3.7.0
File hashes
| Algorithm | Hash digest | |
|---|---|---|
| SHA256 | 97eb03e21baab21cfb8e00f8262aaeeb77dd118efd1bb4cdc582ff7f101107e0 |
|
| MD5 | ba2dffae7da8d450e5f311a707adb128 |
|
| BLAKE2b-256 | 4fa10918f38e17503e4a42c3a81f1f1abf08c1bc51f41246eb15474c1a196ca8 |
