pyexperiment 0.8.11

Description:

pyexperiment 0.8.11

Pyexperiment facilitates the development of small, reproducible
experiments with minimal boilerplate code. Consider the following
example, implementing a simple program that stores numbers and
computes their sum:
from pyexperiment import experiment, state, conf, log

conf['pyexperiment.save_state'] = True
conf['pyexperiment.load_state'] = True
conf['message'] = "The stored numbers are: "

def store(number):
"""Store a number"""
if 'numbers' not in state:
log.debug("Initialize state['numbers'] to empty list")
state['numbers'] = []

log.debug("Store number: %s", number)
state['numbers'].append(float(number))

def show():
"""Show the stored numbers and compute their sum"""
if not 'numbers' in state:
print('No numbers stored yet')
return

print(conf['message'] + str(state['numbers']))
with log.timed("sum"):
total = sum(state['numbers'])
print("The total is: " + str(total))

if __name__ == '__main__':
experiment.main(default=show,
commands=[store, show])
Pyexperiment makes it easy to experiment with this code from the
command line:
$ ./numbers store 42
$ ./numbers store 3.14
$ ./numbers
The stored numbers are: [42.0, 3.14]
The total is: 45.14
$ ./numbers -o message "Numbers: "
Numbers: [42.0, 3.14]
The total is: 45.14
$ ./numbers -v
[DEBUG ] [0.069s] Start: './numbers -v'
[DEBUG ] [0.069s] Time: '2015-08-14 14:23:00.027378'
[INFO ] [0.075s] Loading state from file 'experiment_state.h5f'
The stored numbers are: [42.0, 3.14]
[DEBUG ] [0.076s] sum took 0.000025s
The total is: 45.14
[DEBUG ] [0.078s] No need to save unchanged state
[DEBUG ] [0.078s] End: './numbers -v show'
[DEBUG ] [0.078s] Time: '2015-08-14 14:23:00.037124'
[DEBUG ] [0.078s] Took: 0.010s
$ ./numbers -h
usage: numbers [-h] [-c CONFIG] [-o key value] [-i]
[--verbosity {DEBUG,INFO,WARNING,ERROR,CRITICAL}] [-v]
[-j PROCESSES]
[{store,show,help,test,show_tests,show_config,save_config,show_state,show_commands}]
[argument [argument ...]]

Thanks for using numbers.

positional arguments:
{store,show,help,test,show_tests,show_config,save_config,show_state,show_commands}
choose a command to run, running show by default
argument argument to the command

optional arguments:
-h, --help show this help message and exit
-c CONFIG, --config CONFIG
specify a configuration file
-o key value, --option key value
override a configuration option
-i, --interactive drop to interactive prompt after COMMAND
--verbosity {DEBUG,INFO,WARNING,ERROR,CRITICAL}
choose the console logger's verbosity
-v shortcut for --verbosity DEBUG
-j PROCESSES, --processes PROCESSES
set number of parallel processes used

available commands:

store: Store a number
show (default): Show the stored numbers and compute their sum
help: Shows help for a specified command
test: Run tests for the experiment
show_tests: Show available tests for the experiment
show_config: Print the configuration
save_config: Save a configuration file to a filename
show_state: Shows the contents of the state loaded by the configuration or from the file specified as an argument
show_commands: Print the available commands

Motivation
There is no shortage of great Python libraries for command line
interfaces, logging, configuration file management, persistent state,
parallelism, or plotting. When writing small scripts for quick
experiments though, it’s often too much effort to configure these
components, and one ends up rewriting the same setup code over and
over again.
Pyexperiment fixes this by providing a simple way to jump start short
experiments. Importing pyexperiment will give you:

A basic command line interface that allows calling arbitrary
functions (and passing arguments) from the command prompt,
providing help text derived from the functions’ docstrings and
zsh/bash autocompletion (based on the standard library’s argparse
and argcomplete).
A simple configuration management with an easy way to provide
default values (based on the excellent configobj library).
A thread-safe logger with configurable logging levels, timing
utilities with statistics, and rotating log files (based on the
standard library’s logging module).
Persistent state with platform independent, configurable,
(optionally rotating) state files that are compatible with many other
programs (based on h5py).
Parallel execution of replicates.
A sensible setup for plotting (based on matplotlib, and optionally
seaborn), with configurable defaults and asynchronous plotting.
Many other bits and pieces that might come in handy…

As a design principle, pyexperiment’s components come ready to use
without any further configuration. Inevitably then, the choices made in
this setup are opinionated and may or may not fit your personal taste.
Feel free to start a discussion on the
issues page.
For more documentation, see the automatically generated pages here. For more usage examples,
check the examples
folder.


Installation
The easiest way to install pyexperiment is from pypi, just call pip install --user pyexperiment (alternatively, use pip install pyexperiment in a
virtualenv, or prepend sudo for system wide installation).
The pyexperiment package has a few external dependencies (as you can
see in the requirements.txt):

six
configobj
numpy
h5py
matplotlib
lockfile
toolz
IPython (optional, allows using IPython with the –interactive command)
argcomplete (optional, adds activate_autocompletion command)
seaborn (optional, adds more plotting options)

If you install (the h5py dependency) from pypi, you may need to install
libhdf5 first, e.g., by running sudo apt-get install libhdf5-dev.
You may also find that you need to install cython first, e.g., by
running either sudo apt-get install Cython or pip install Cython.


Reproducible experiments
To keep your experiments reproducible and avoid dependency problems, it
is a good idea to automate the setup of your development environment,
e.g., using a Vagrant box, or - in many cases even better - a Docker
image. To get started with pyexperiment using Vagrant or Docker, you can
use the Vagrantfile and setup script
here,
or the Dockerfile and setup scripts
here.


License
The pyexperiment package is licensed under an MIT licence (see the
LICENSE).