Session doesn’t start: lightdm, xrdp, xfce4

What is the correct way to kill a vncsession in linux?

$ cat /etc/xrdp/xrdp.ini

$ cat /etc/xrdp/sesman.ini
[Logging]
LogFile=/var/log/xrdp-sesman.log
$ rm -rf ~/.cache/*
$ ls -la .xsession
$ ls -la .ICEauthority
$ cat ~/.cache/upstart/startxfce4.log

$ ps ax | grep vnc
25697 ?        S     55:38 Xvnc4 :1 [...]
[...]
30481 ?        S     17:57 Xvnc4 :2 [...]
$ vncserver -kill :1
or
$ kill 25697

Python 2.7

EAFP is a Python acronym that stands for easier to ask for forgiveness than permission. This coding style is highly pushed in the Python community because it completely relies on the duck typing concept, thus fitting well with the language philosophy.

The concept behind EAFP is fairly easy: instead of checking if an object has a given attribute or method before actually accessing or using it, just trust the object to provide what you need and manage the error case.

Datatypes

Lists

An Introduction to Python Lists
Python Lists

Dict

Dictionaries
Python Dictionary
Add to a dictionary in Python?
Python add new item to dictionary [duplicate]

Iterators & Generators

Iterators & Generators

Classes and Objects

Object Oriented Programming
Python’s Super is nifty, but you can’t use it
correct way to use super (argument passing)
Python 3 OOP Part 1 – Objects and types
Python 3 OOP Part 2 – Classes and members
Python 3 OOP Part 3 – Delegation: composition and inheritance
Python 3 OOP Part 4 – Polymorphism
Python 3 OOP Part 5 – Metaclasses
Python 3 OOP Part 6 – Abstract Base Classes

Datamodel

3.4.1. Basic customization (__init__, __str__, …)

Uniform Access Principle / Property / Class Attribute

“public” or “private” attribute in Python ? What is the best way?
Python Class Attributes: An Overly Thorough Guide
What’s the difference between a Python “property” and “attribute”?
Private Variables and Class-local References
Implementing Descriptors

old-style vs. new-style

New-style Classes
What is the difference between old style and new style classes in Python?
old-style and new-style classes in Python 2.7? [duplicate]

args and kwargs

Understanding kwargs in Python
*args and **kwargs? [duplicate]
What does ** (double star) and * (star) do for Python parameters?

Webserver / WSGI

Web Server Gateway Interface (WSGI) Servers

Documentation / docstring

sphinx.ext.napoleon – Support for NumPy and Google style docstrings
Example Google Style Python Docstrings
Example NumPy Style Python Docstrings

PEP 257 – Docstring Conventions
PEP 258 – Docutils Design Specification
numpy – How-to document
How to document a method with parameter(s)?
Sphinx Code Example

How to document fields and properties in Python?
How to document class attributes in Python?

Rewriting Python Docstrings With a Metaclass

PyCharm

File -> Settings -> Build, Execution, Deployment -> Python Debugger -> Collect run-time types information for code insight

Using Docstrings to Specify Types
Creating Documentation Comments
Generating Reference Documentation (DocUtils, Sphinx)
Python Integrated Tools (Docstring format: Plain, reStructuredText, Epytext)
Documenting Source Code in PyCharm (reStructuredText, Epytext)
PY-9795: wish list item: support for google python style type comments (sphinx.ext.napoleon)

Lasersaur Laser Cutter: Lasaur

Drawing Interchange Format (DXF)

Wikipedia: Drawing Interchange Format (DXF)

libdxf
LibreDWG
AutoCAD 2008 DXF Reference (PDF)
QCAD – 2D CAD for Windows, Linux and Mac
VisiCut – a userfriendly tool for laser-cutting

DXF File format _ Polyline
AutoCAD DXF File Format Summary
DXF.TXT – Drawing Interchange and File Formats
DXF10.spec – Drawing Interchange and File Formats
Minimum Requirements for Creating a DXF File of a 3D Model
Open Design Specification for .dwg files (PDF)
Structure Of DXF File Format
Chapter 6 — ENTITIES Section – POLYLINE
KLayout – DXF Format
DXF, Revision 12

Are there any libraries for parsing AutoCAD files?

QCAD – What is dxflib?
QCAD – Download dxflib (OpenSource)

Using AutoCAD file formats with open source libraries

  0                # 
SECTION            # Section

  2                #
HEADER             # Header

  9                #
$ACADVER           # Key

  1                #
AC1018             # Value

  9                #
$ACADMAINTVER      # Key

 70                #
     0             # Value

  0                #
ENDSEC             # End Section

[...]

  0                #
SECTION            # Section

  2                #
ENTITIES           # Section Name: "Entities"

  0                #
POLYLINE           # First Entity

  5                #
40                 # Polyline ID

330                #
1F                 # 

100                #
AcDbEntity         #

  8                #
sheet              # Layer Name: "sheet"

[...]

 10                #
121.6670087034155  # Groupcode Start X: 121.6670087034155

 20                #
166.9818181818182  # Groupcode Start Y: 166.9818181818182

 30                #
0.0                # Groupcode Start Z: 0.0

  0
VERTEX             # Add new vertex

  5                #
42                 # Element Reference: 42