Thursday, December 1, 2016

Python 3.4 and Flask module - part 001.

This is a simple tutorial about how to install Flask python module under python 3.4 .
I think this can also working with any python 3.x versions.
Flask is a microframework for creating web applications.
First you need to install your python 3.4 and then you will get the pip script from here.
About pip you can read more on the pip webpage.
Run the pip install:
python get-pip.py

Go to into your Python folder and start the pip installation of Flask python module.
C:\Python34>cd Scripts
C:\Python34\Scripts>pip install Flask
Downloading/unpacking Flask

This is the first step. The next step is to start the default webpage.
Using python command shell you can test the Flask python module.

>>> from flask import Flask
>>>
>>> app = Flask(__name__)
>>>
>>> @app.route('/')
... def homepage():
... return "Hi there, how ya doin?"
...
>>>
>>> if __name__ == "__main__":
... app.run()
...
* Running on http://127.0.0.1:5000/
127.0.0.1 - - [26/Sep/2014 23:25:01] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [26/Sep/2014 23:25:02] "GET /favicon.ico HTTP/1.1" 404 -


As you can see is running into browser at http://127.0.0.1:5000 .
Let's put this into one python script.
You need to make a new folder called FlaskApp and go to this folder.
Make a new script named app.py with the source code you tested.
Now you can just run the script and all will be working well.
Flask looks for template files inside the templates folder.
Go to the folder FlaskApp and create a folder called templates.
Now, create a file called index.html and fill with you html source code.
To call this index.html you need to add this line of source code ino your script:
from flask import Flask, render_template and
def main():
return render_template('index.html')

Start your python script and you will see the content of your index.html.

Wednesday, November 30, 2016

OpenGL and OpenCV with python 2.7 - part 004.

Today I will continue the series of graphics processing in OpenGL and OpenCV.
The goal of this tutorial is the download and load into the python script of youtube video.
To do that we need another two modules python.
First, I download and install the python 2.7.12 32 bit version from internet.
C:\Python27>python.exe
Python 2.7.12 (v2.7.12:d33e0cf91556, Jun 27 2016, 15:19:22) [MSC v.1500 32 bit (
Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.

First update the pip tool and install numpy python module:
C:\Python27\Scripts>python -m pip install --upgrade pip
Collecting pip
Downloading pip-9.0.1-py2.py3-none-any.whl (1.3MB)
100% |################################| 1.3MB 419kB/s
Installing collected packages: pip
Found existing installation: pip 8.1.1
Uninstalling pip-8.1.1:
Successfully uninstalled pip-8.1.1
Successfully installed pip-9.0.1
C:\Python27\Scripts>pip install numpy
Collecting numpy
Downloading numpy-1.11.2-cp27-none-win32.whl (6.5MB)
100% |################################| 6.5MB 79kB/s
Installing collected packages: numpy
Successfully installed numpy-1.11.2

The main reason to have the numpy python module: it is often used with OpenCV python module.
For OpenCV python module installation you need to see my tutorial.
After you install it, test the OpenCV python module:
C:\Python27>python.exe
Python 2.7.12 (v2.7.12:d33e0cf91556, Jun 27 2016, 15:19:22) [MSC v.1500 32 bit (
Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> print cv2.__version__
3.0.0

Install pafy python module.
This module help you to download video from youtube but you need also the youtube-dl python module.
So lets install the youtube-dl and pafy python modules.
C:\Python27>cd Scripts
C:\Python27\Scripts>pip install youtube-dl
Collecting youtube-dl
Downloading youtube_dl-2016.12.1-py2.py3-none-any.whl (1.5MB)
100% |################################| 1.5MB 377kB/s
Installing collected packages: youtube-dl
Successfully installed youtube-dl-2016.12.1
C:\Python27\Scripts>pip install pafy
Collecting pafy
Downloading pafy-0.5.2-py2.py3-none-any.whl
Installing collected packages: pafy
Successfully installed pafy-0.5.2

I make a simple python script named: get_yt.py.
The source code of this script is simple:
import os
import pafy
# Download the video
video = pafy.new('https://www.youtube.com/watch?v=O5VCjktWVD4')
print "video.title"
print video.title
print "video.rating"
print video.rating
print "video.viewcount, video.author, video.length"
print video.viewcount, video.author, video.length
print "video.duration, video.likes, video.dislikes"
print video.duration, video.likes, video.dislikes
print "video.description"
print video.description
resolution = video.getbestvideo(preftype="mp4")
print "resolution"
print resolution
input_movie = resolution.download(quiet=False)
print "input_movie"
print input_movie
print "delete movie"
os.remove(input_movie)

I used the url of videoclip from youtube channel of Arden Cho to tested.
If you want to keep the video into your folder just remove the last line from the python script.
The result is this output:
C:\Python27>python.exe get_yt.py
video.title
Can't Help Falling in Love With You - Arden Cho
video.rating
4.99041318893
video.viewcount, video.author, video.length
10980 ardenBcho 168
video.duration, video.likes, video.dislikes
00:02:48 1665 4
video.description
Recorded this song a couple months ago when I was in Boston, this song always re
minds me of holidays and love so sharing that with you!

Guitar by Koo Chung https://youtube.com/koochung
Violin and Video editing/production by Daniel Jang https://www.youtube.com/metal
sides
Production + Keys by Tim Bongiovanni https://www.northgateproductions.net
Filmed by Rob Mark https://www.instagram.com/rmarq_

If you like my music comment and SHARE! You can also support me by buying & rati
ng my album on iTunes!! https://itunes.apple.com/us/album/my-true-happy/id592588
859

You can follow me at: SnapChat: ardencho
http://www.instagram.com/arden_cho
http://www.facebook.com/hiardencho
http://www.twitter.com/arden_cho
http://www.imdb.me/ardencho
resolution
video:mp4@1920x1080
input_movie5 Bytes [100.00%] received. Rate: [5371 KB/s]. ETA: [0 secs]
Can't Help Falling in Love With You - Arden Cho.mp4
delete movie