Django Learn Series| Settings

Django Learn Series| Settings

Django RaviTeja   10:01:00 PM

1. settings.py is global to all apps in a django project.
2. Django documentation in this link provides good overview of the settings.
3. This link provides more detailed info of these settings
4. Settings those needed change for first time.
• INSTALLED_APPS
• TEMPLATES
• STATICFILES_DIRS
5. Settings those might needed change.
• DEBUG
• Set to true by default, but is best set to false when your web project is deployed. When DEBUG is true, any stack traces are shown in the webpage, which is helpful for development but is a security risk when the side is publicly available.
• DATABASES
• We're using the built in default database called SQLite, but if you want to use a production ready database such as PostgreSQL or MYSQL, You'll need to change the engine and name entries in the DATABASES setting and in production, you'll need to set the user and password entries for authentication
• 
  

Django Learn Series | Creating a Django App

Django Learn Series | Creating a Django App

Django RaviTeja   11:38:00 PM

1. cd Desktop/DjangoPractice/firstdjango
2. python manage.py startapp firstapp
3. Files inside firstapp folder are below
1. models.py -- DB interaction
2. admin.py -- admin interface
3. views.py -- App's logic and URL request / response
4. tests.py -- Automated tests 
5. migrations folder -- auto generated. Migration files about DB tables changes for the app

Django Learn Series | Creating a Django project

Django Learn Series | Creating a Django project

Django RaviTeja   11:28:00 PM

1. source djangoTestEnv/bin/activate
2. Create a folder like DjangoPractice on Desktop
3. cd Desktop/DjangoPractice
4. django-admin startproject firstdjango
• Auto creates  a folder named firstdjango and required files in it
• Subfolder named firstdjango inside firstdjango will have 
• init.py
• settings.py
• Configures Django
• urls.py
• Routes requests based on URL
• wsgi.py
• provides a hook for webservers
• WSGI is the Web Server Gateway Interface. It is a specification that describes how a web server communicates with web applications, and how web applications can be chained together to process one request.
• WSGI is a Python standard described in detail in PEP 3333.
• main folder firstdjango will have manage.py
• manage.py runs commands related to firstdjango
5. cd firstdjango
6. python manage.py
• To check list of available command
7. python manage.py runserver
• To start the webserver

Django Learn Series | Installation

Django Learn Series | Installation

Django RaviTeja   10:42:00 PM

On Ubuntu Machine, use below steps.

1. sudo -H pip install virtualenv
• Using pip and installing virtualenv (recommended) instead of global installation
2. virtualenv -p python djangoTestEnv
• djangoTestEnv is sample name of virtual environment
3. source djangoTestEnv/bin/activate
• Activating djangoTestEnv
4. pip install django
• Installing django in djangoTestEnv
5. pip freeze
• This is to check installed packages in that  djangoTestEnv
6. django-admin --version
• This is to check the version of django installed in djangoTestEnv

[How To] Convert Qt Designer file.py to Python Code

[How To] Convert Qt Designer file.py to Python Code

Ubuntu RaviTeja   11:45:00 PM

Assuming input.ui is the file created in Qt Designer, output.py is the python code file name,

1. open Terminal and cd to input.ui folder.
2. Type pyuic4 -x input.ui -o output.py and hit Enter
3. output.py gets created in same folder and run it from Python to get the UI window.

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[How To] Install PyQt4 and Qt Designer for Python 2

[How To] Install PyQt4 and Qt Designer for Python 2

Ubuntu RaviTeja   11:39:00 PM

For Ubuntu:

Below is the command to install  PyQt4 and Qt Designer for Python 2

sudo apt-get install pyqt4-dev-tools qt4-designer

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ERROR: build.xml:taskdef A class needed by class com.android.ant.GetUiTargetTask cannot be found: com/android/utils/ILogger

ERROR: build.xml:taskdef A class needed by class com.android.ant.GetUiTargetTask cannot be found: com/android/utils/ILogger

Ubuntu RaviTeja   12:56:00 PM

ERROR:
~/.buildozer/android/platform/android-sdk-XX/tools/ant/build.xml:taskdef A class needed by class com.android.ant.GetUiTargetTask cannot be found: com/android/utils/ILogger

Context:
Running ant debug for buildozer



SOLUTION:

1. Back up the Lib folder in /usr/share/ant (check by using whereis ant) of original ant installation.
2. Make a link of ~/.buildozer/android/platform/android-sdk-XX/tools/lib and copy it to /usr/share/ant so that /usr/share/ant/lib points to ~/.buildozer/android/platform/android-sdk-XX/tools/lib

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