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# Taken from: http://stackoverflow.com/questions/13270888/why-is-startswith-slower-than-slicing

import dis
dis_it = lambda x: dis.dis(compile(x, '<none>', 'eval'))

#x = range(1000)
#>>> dis_it('x[::-1]')
  #1           0 LOAD_NAME                0 (x)
              #3 LOAD_CONST               0 (None)
              #6 LOAD_CONST               0 (None)

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# Taken from: http://qt-project.org/doc/qt-4.8/qevent.html#type
# Reformatted with: cat /tmp/events.txt | sort -t$'\t' -k2 -n | column -t -s $'\t'

QEvent::None                              0                    Not an event.
QEvent::Timer                             1                    Regular timer events (QTimerEvent).
QEvent::MouseButtonPress                  2                    Mouse press (QMouseEvent).
QEvent::MouseButtonRelease                3                    Mouse release (QMouseEvent).
QEvent::MouseButtonDblClick               4                    Mouse press again (QMouseEvent).
QEvent::MouseMove                         5                    Mouse move (QMouseEvent).
QEvent::KeyPress                          6                    Key press (QKeyEvent).

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class mycontext(object):
    def __enter__(self, *args, **kwargs):
        print 'enter'
    def __exit__(self, *args, **kwargs):
        print 'exit'


def myfunc():
    with mycontext():
        # Gee what will happen here?

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Python versioning

Motivation

I recently spent a little time reviewing a Python bug report and determining if I was running with a fixed version of the Python interpreter. I think this is a useful exercise for someone who is overly curious and not a core developer of the language.

This post is a rundown of my thought process while trying to figure this out.

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# Snippet taken from: https://github.com/JakeWharton/pidcat/blob/master/pidcat.py

# unpack the current terminal width/height
data = fcntl.ioctl(sys.stdout.fileno(), termios.TIOCGWINSZ, '1234')
HEIGHT, WIDTH = struct.unpack('hh',data)

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Development Status :: 1 - Planning
Development Status :: 2 - Pre-Alpha
Development Status :: 3 - Alpha
Development Status :: 4 - Beta
Development Status :: 5 - Production/Stable
Development Status :: 6 - Mature
Development Status :: 7 - Inactive
Environment :: Console
Environment :: Console :: Curses
Environment :: Console :: Framebuffer

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# This is a raw listing of the imports that take place dynamically by calling
# the pyqtgraph/__init__.py:importAll() in the following scenarios:

#importAll('graphicsItems', globals(), locals())
#importAll('widgets', globals(), locals(), excludes=['MatplotlibWidget', 'RemoteGraphicsView'])

from .graphicsItems.ArrowItem import ArrowItem
from .graphicsItems.GraphicsWidgetAnchor import GraphicsWidgetAnchor
from .graphicsItems.GraphicsWidgetAnchor import Point
from .graphicsItems.GraphicsWidgetAnchor import QtCore

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Bugs

Can't code without them, so code against them!

Presentation

• Live slides
  • Use and arrow keys to step through
• Presentation markdown source
  • Links to repository with actual markdown source that is used for HTML5 slides
• Landslide
• Great Python library to turn markdown into HTML slides

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Filtering and Deduplicating Data in IPython Notebook

• Nice shortcut to create a list of strings

fields = '''\
test1,
test2,
test3,
test4'''.split()

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{
 "metadata": {
  "name": "NikePlus data exploration"
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {