durden

from contextlib import contextmanager


@contextmanager
def slot_disconnected(signal, slot):
    """
    Create context to perform operations with given slot disconnected from
    given signal and automatically connected afterwards.

    usage:

durden

Notes for Python Science Apps talk

Presentation

• Live slides
  • Use and arrow keys to step through
• Video of talk from Pycon 2013
  • I had the pleasure of giving this talk at Pycon 2013 in a slightly shorter form.
• Presentation markdown source
  • Links to repository with actual markdown source that is used for HTML5 slides
• Landslide

durden

# Turn list of rows into columns

>>> x = [(1,2,3), (4,5,6)]
>>> zip(*x)
[(1, 4), (2, 5), (3, 6)]

# Reverse key-value mapping in a dict

>>> x = {'a': 1, 'b': 2}
>>> dict([reversed(kv) for kv in x.iteritems()])

durden

" Searches Dash for the word under your cursor in vim, using the keyword 
" operator, based on file type. E.g. for JavaScript files, I have it 
" configured to search j:term, which immediately brings up the JS doc
" for that keyword. Might need some customisation for your own keywords!

function! SearchDash()
  " Some setup
  let s:browser = "/usr/bin/open"
  let s:wordUnderCursor = expand("<cword>")

durden

def profile_this(fn):
    def profiled_fn(*args, **kwargs):
        fpath = fn.__name__ + '.profile'
        prof = cProfile.Profile()
        ret = prof.runcall(fn, *args, **kwargs)
        prof.dump_stats(fpath)
        return ret
    return profiled_fn

@profile_this

durden

# Example modified from:
#   http://pysnippet.blogspot.com/2010/06/qsignalmapper-at-your-service.html

#
# Example showing how QSignalMapper can be used to manage an arbitrary
# numbers of parameterless signals and re-emit them with an argument
# identifying the sender.
#
# Each signal is associated in the QSignalMapper with either an int,
# QString, QObject or a QWidget which is passed as argument to the slot

durden

from PyQt4.QtCore import pyqtSignal, QObject
from PyQt4.QtGui import QApplication, QFrame, QGridLayout, QPushButton


class View(QFrame):
    openStuff = pyqtSignal()

    def __init__(self, parent=None):
        super(View, self).__init__(parent)

durden

def debug_signals(cls):
    """
    Attach to all available signals in decoratored class and print debug
    message each time one of the signals is emitted.
    """

    from PyQt4 import QtCore

    def stripArgsFromSignature(signature):
        """

durden

def _parse_config_file(config_file):
    """
    Parse given config file and return dict of settings
    
    [load]
    files=a,b,c

    [process]
    for x in xrange(10):
        foo()

durden

#
# © 2011 Christopher Arndt, MIT License
#
# Taken from: http://wiki.python.org/moin/PythonDecoratorLibrary

import time

class cached_property(object):
    '''Decorator for read-only properties evaluated only once within TTL period.