signalpillar

from itertools import imap

def create_future():
    future = ...
    # add tulip-like callback chain
    fns = [first_callback_fn, second_callback_fn, third_callback_fn]
    future.set_callback(tulip_chain(fns))
    
    # in case you want to remove some of the functions in the chain
    # just modify list of functions - you gain much more flexibility 

signalpillar

Concurrency VS Parallelism

Recently, at OHUG (Odessa Haskell User Group), we have raised a question: what is the difference between Parallelism and Concurrency. And seems like I have conflated terms Multitasking and Parallelism and want here to recap for myself the difference between these popular terms

• Parallelism - means that two or more calculations happen simultaneously
  • form [haskell.org][4]
    • The term Parallelism refers to techniques to make programs faster by performing several computations in parallel. This requires hardware with multiple processing units. In many cases the sub-computations are of the same structure, but this is not necessary. Graphic computations on a GPU are parallelism.
  • from [Rob Pike presentation - Concurrency is not Parallelism (it's better)][3]
• Parallelism is about doing lots of things at once.

signalpillar

from itertools import dropwhile, takewhile

def read_file_content(path):
    '@types: str -> str'
    with open(path, 'r') as f:
        return f.read()

def line_matches_keyword(line):
    return line.find('Traceback') == -1
    

signalpillar

>>> dict = {1: 2}
>>> dict[1] = 3
>>> dict
{1: 3}
>>> class A:
...     def __hash__(self):
...             return 1
... 
>>> class B:
...     def __hash__(self):

signalpillar

# install python htmldoc pdftk
import os
 
from subprocess import Popen
 
pdfs = []

DEPTH = 20

for i in xrange(1, DEPTH):

signalpillar

I like tools that have some philosophy underneath and in this topic I will talk about Markdown. I also wanted to tell some words about Gist but I think you will explore its benefits while reading my dev notes as small gists.

Markdown (MD)

This is one of things I have opened relatively recently. Amazing approach how to think about any text in context of formatted document, in context that document has to be presented in readable way so must be marked up. Even in case if there is no support (Outlook, zim, skype or even git comments) for this markup I write text in MD as it declares very basic level how to express formatting. For instance all keywords I mark using back-quotes and so on.

I believe that every new product oriented for IT person if it has editable forms must support markdown. For instance, different popular products with web-client have tons of problems regarding text fileds. WYSIWYG that does basics in formatting require from my side anormouse amount of movements.

There must be stan

signalpillar

;; function to kill buffer and close other window without switching to it
(defun kill-other-buffer-and-window ()
  (interactive)
  (kill-buffer (other-buffer))
  (delete-other-windows))