Easy way to manage python virtual environments.

Pre-requisites

• Python 3.x or Python 2.7.x
• pip (Python package installer)

1. Installation

• Use pip to install pipenv

$ python -m pip install --upgrade pipenv$ pipenv --version  # Verify installation

2. Create a new pipenv project

• There are multiple ways to create projects using pipenv. Examples:

# i. Creates new project using the latest version of python 2x or 3x$ pipenv --two
$ pipenv --three
# ii. Using a specific python version
$ pipenv --python 3.6.5
# iii. Specify a path where python is installed
$ pipenv --python /path/to/python

3. Manage project dependencies

• The project dependencies are stored inside the Pipfile
• Example:

$ pipenv install requests

• It’s also possible to install dependencies that will be used in the development environment only.
• Example:

$ pipenv install --dev pytest

References

• pipenv — help (Run from the command line)
• Official pipenv documentation

A brief comparison of networking modes in Oracle Virtualbox.

NAT

• NAT(Network Address Translation) mode is the default mode when you spin up a new virtual machine(vm) on virtual box.
• This mode allows the vm to communicate with the ‘internet’ by using the host machine as a proxy

• Communication to the vm can be made by configuring port forwarding through the vritualbox GUI or a CLI tool such as Vagrant.

# Example (using vagrant):config.vm.network "forwarded_port", guest: 22, host: 2222

• This means all traffic to port 2222 on the host will be forwarded to port 22 of the vm.

NAT Network

• Instead of creating…

Example: Say you have an authentication API, that receives a JSON request to register a new user.

How would you log events that occur in the end-to-end new user registration process? Here’s how I would do it:

• The arrows represent the setting on your logger instance
• For example, if you set the level to DEBUG, you will see all the logs in your logs.
• If you set it to warn, you will only see warning, error and fatal logs. Assuming you are using a single logging instance(i.e. All logs go to a single log file)

Using multiple loggers

• If you use multiple logging…

Reference: pyinstaller home

Question: How do you go from python myscript.py -verbose to just myscrpt -verbose? Follow along to find out!

Before we begin

1. Install the required packages

$ pip install --upgrade pyinstaller

2. Add the python scripts folder to the system path if you have not done so already

The basics

1. Basic usage

$ pyinstaller <your-script>.py# output(s):
# <your-script>.spec - Default settings used to generate exe
# build/ - Build artifacts e.g. build logs
# dist/ - contains <your-script>.exe + python dependencies

2. Useful options

• — name | Specify the name of the generated executable
• — onefile | Bundle all binary artifacts into…

This simple guide will show you how you can use pyinstaller and argparse to create a simple console application with python.

Required tools

• Python 3.x (with pip)
• Python code editor e.g. Pycharm
• psutil

$ pip install --upgrade psutil

• pyinstaller

$ pip install --upgrade pyinstaller

Lets try this out by creating a simple console app that will list processes or applications that are currently running on your PC.

1. Create a python script named proclist.py

• We use psutil.process_iter([‘pid’, ‘name’]) to get a list of all processes running on a machine
• The argparse ibrary allows the user of our script to specify…

Before we begin: Make sure vagrant is installed in your machine and added to the path. To verify, run vagrant -v and make sure you get a version number of the vagrant version installed on your machine.

Reference: Vagrant Official Docs

TOP 10

1. vagrant init

• Initialize a new vagrant environment by creating a new Vagrantfile if it does not already exist.

# Syntax: vagrant init [name [url]]
# name = name of the box to create i.e. config.vm.box
# url = url to download the box from
# Example:$ vagrant init my-company-box https://boxes/example.box

2. vagrant up

# Syntax: vagrant up [name|id]…

WPF DataGrid Control — Provides flexible a way to display collection of data in rows and columns

• In simple terms a DataGrid is a customizable grid used to display data collections
• The DataGrid control also provides some useful built in functionalities for data display, i.e.

# Sorting # Grouping # Filtering etc.

This article assumes you have some exposure to WPF and common data display controls such as ListBoxes,ListViews etc.

1. Basic DataGrid — Auto-generated Columns

• If you only want to display you data collection, the code below is sufficient to get you started. Full source code.

• By default the DataGrid…

The term control is generally used to refer to any visual element in a WPF application. Technically this can imply that the element inherits the Control class.

• A WPF application can be defined loosely as a nested grouping of control elements inside layout panels encapsulated by a single root element, i.e. Window or Page

Layout Panels

• As mentioned above, UI elements or controls are arranged inside layout panels which inherit form the Panel class.
• The most common panels in WPF are:

Grid: Child controls are positioned using rows and columns.

StackPanel: Child controls are stacked along a single axis( x or y).

…