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import datetime
import threading


class PeriodicTimer(object):
    """
    A class wrapping a callable to be called periodically inside a thread.

    The wrapped function is called the first time immediately after creating
    an instance of this class.

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#! /usr/bin/env python
# -*- coding: utf-8 -*-

"""
A tool for signaling processes found also by their command-line invocation.

Sometimes you want to terminate a process based on some specific substring
in the command that was entered in a terminal to start it, e.g. here you
might want to terminate only a process like this that is running a Python
SimpleHTTPServer started with::

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from __future__ import print_function

"""
Create a structured, but more compact JSON representation of a native data structure.

This is inspired by the way native Python data structures are displayed in Jupyter,
e.g.:

In [1]: d = {"count": 7, "limit": 7, "results": [{"path": "wifi", "meaning": "rssi", "points": [{"timestamp": 1458211728242, "value": -67}, {"timestamp": 1458211736170, "value": -74}, {"timestamp": 1458211740399, "value": -62}, {"timestamp": 1458211746265, "value": -64}], "deviceId": "1e31f865-93b9-482a-a7be-858b56c396ae"}, {"path": "/", "meaning": "batteryLevel", "points": [{"timestamp": 1458211728413, "value": 90}, {"timestamp": 1458211736216, "value": 90}, {"timestamp": 1458211740443, "value": 90}], "deviceId": "1e31f865-93b9-482a-a7be-858b56c396ae"}], "offset": 0}

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Nix vs. Python

An attempt at contrasting Nix and Python syntax (maybe helpful to grasp Nix faster for those with a Python background) based on the "Nix tour" found here: https://nixcloud.io/tour/?id=1

1. A tour of Nix

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+-----+-----------------+-----------------+
|   # | Package Name    | Total Downloads |
+-----+-----------------+-----------------+
|   1 | setuptools      |      52,454,151 |
|   2 | requests        |      42,297,369 |
|   3 | virtualenv      |      38,499,034 |
|   4 | distribute      |      36,848,278 |
|   5 | six             |      34,594,923 |
|   6 | boto            |      33,578,502 |
|   7 | pip             |      29,951,145 |

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#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
An experiment in speed reading texts in a terminal.

It implements a "poor man's" version running in a plain terminal. The speed 
is given in wpm, words per second. KeyboardInterrupts are captured for pausing 
the presentation. At the end a summary is printed. This toy project is much 
inspired by an iOS app named ReadQuick:

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"""
Run the algorithm below using CPython, Cython, PyPy and Numba and compare 
their performance. (This is implementing a spigot algorithm by A. Sale, 
D. Saada, S. Rabinowitz, mentioned on
http://mail.python.org/pipermail/edu-sig/2012-December/010721.html).
"""

def pi_digits(n):
    "Generate n digits of Pi."
    k, a, b, a1, b1 = 2, 4, 1, 12, 4