Tag Archives: python

SymPy python module with Python 3.4.1 .

23/08/2015 by admin · Leave a comment

SymPy is a Python library for symbolic mathematics.
This module is a computer algebra system (CAS) written in the Python programming language.
A large can be found on this blog aggregator at planet.sympy.org.
First, You need to install it using pip3.4.

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C:\Python34\Scripts>pip3.4.exe install sympy
Collecting sympy
  Downloading sympy-0.7.6.tar.gz (6.4MB)
    100% |################################| 6.4MB 35kB/s
Building wheels for collected packages: sympy
...
Successfully built sympy
Installing collected packages: sympy
Successfully installed sympy-0.7.6

For a short introduction into SymPy python module I will show you the printing features.
The most common printers available in SymPy are:

  • str
  • repr
  • ASCII pretty printer
  • Unicode pretty printer
  • LaTeX
  • MathML
  • Dot

Let’s test it this first example:

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<XML>C:\Python34>python
Python 3.4.1 (v3.4.1:c0e311e010fc, May 18 2014, 10:45:13) [MSC v.1600 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from sympy import *
>>> x,y,z = symbols('x y z')
>>> Integral(sqrt(1+1/x),x)
Integral(sqrt(1 + 1/x), x)
>>> init_session(quiet=True)
Python console for SymPy 0.7.6 (Python 3.4.1-64-bit) (ground types: python)
 
>>> Integral(sqrt(1+1/x),x)
  /
|
|     _______
|    /     1
|   /  1 + -  dx
| \/       x
|
/
>>></XML>

How to print one matrix :

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<XML>>>> x, y, z = symbols('x, y, z')
>>> init_session(quiet=True)
Python console for SymPy 0.7.6 (Python 3.4.1-64-bit) (ground types: python)
 
>>> mat = Matrix([x*y, 1,0,3,-2, sin(z)])
>>> mat
[ x*y  ]
[      ]
[  1   ]
[      ]
[  0   ]
[      ]
[  3   ]
[      ]
[  -2  ]
[      ]
[sin(z)]
>>></XML>

Next example come with this issue: equations can be solved with SymPy python module.

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<XML>>>> solve(x*x+x+2)
         ___            ___
   1   \/ 7 *I    1   \/ 7 *I
[- - - -------, - - + -------]
   2      2       2      2
>>> solve(Eq(x*x+x+2))
         ___            ___
   1   \/ 7 *I    1   \/ 7 *I
[- - - -------, - - + -------]
   2      2       2      2
>>> solve(Eq(x*x+2*x+4))
        ___           ___
[-1 - \/ 3 *I, -1 + \/ 3 *I]
>>> solve(x*x+2*x+4)
        ___           ___
[-1 - \/ 3 *I, -1 + \/ 3 *I]
>>></XML>

Posted in All, Python. Tagged with , , , , .

Pillow python module with Python 3.4.1 .

23/08/2015 by admin · Leave a comment

Pillow python module is the python PIL fork created by Alex Clark and Contributors.
As you know the PIL python module is the Python Imaging Library by Fredrik Lundh and Contributors.
I used Python 3.4 version with pip to install and upgrade the Pillow 2.8.1 python module.
The Pillow module version >= 2.0.0 supports Python versions 2.6, 2.7, 3.2, 3.3, 3.4 and no longer supports “import _imaging”. Please use “from PIL.Image import core as _imaging” instead.
Pillow and PIL cannot co-exist in the same environment and you nned to uninstall PIL and after install the Pillow python module.

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C:\Python34\Scripts&gt;pip3.4.exe install pillow
Requirement already satisfied (use --upgrade to upgrade): pillow in c:\python34\lib\site-packages
 
C:\Python34\Scripts&gt;pip3.4.exe install pillow --upgrade
Collecting pillow
  Downloading Pillow-2.9.0-cp34-none-win_amd64.whl (1.3MB)
    100% |################################| 1.3MB 98kB/s
Installing collected packages: pillow
  Found existing installation: Pillow 2.8.1
    Uninstalling Pillow-2.8.1:
      Successfully uninstalled Pillow-2.8.1
Successfully installed pillow-2.9.0

Now you need to use PIL insead the Pillow. Let see:

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C:\Python34\Scripts&gt;cd ..
C:\Python34&gt;python
Python 3.4.1 (v3.4.1:c0e311e010fc, May 18 2014, 10:45:13) [MSC v.1600 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
&gt;&gt;&gt; import PIL
&gt;&gt;&gt; from PIL import *
&gt;&gt;&gt; dir(PIL)
['PILLOW_VERSION', 'VERSION', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__path__', '__spec__', '_plugins']
&gt;&gt;&gt; print(PIL.VERSION)
1.1.7
&gt;&gt;&gt; print(PIL.PILLOW_VERSION)
2.9.0
&gt;&gt;&gt;

Posted in All, Python, Windows 10. Tagged with , , , , .

The haralyzer python module.

22/08/2015 by admin · Leave a comment

The HAR file is an open file format for archiving HTTP packets.
You can find a lot of tools available to analyse, visualize HAR files.
Today I will show you how to use haralyzer python module to show infos about your website.
This python module contains two classes for analyzing web pages based on a HAR file.
I install this python module using pip3.4 under Python 3.4.1 version.

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C:\Python34\Scripts\pip3.4.exe install haralyzer
Collecting haralyzer
Using cached haralyzer-1.4.3.tar.gz
Collecting cached-property (from haralyzer)
Using cached cached_property-1.2.0-py2.py3-none-any.whl
Requirement already satisfied (use --upgrade to upgrade): numpy in c:\python34\lib\site-packages (from haralyzer)
...
Building wheels for collected packages: haralyzer
Running setup.py bdist_wheel for haralyzer
Stored in directory:
...
Successfully built haralyzer
Installing collected packages: cached-property, haralyzer
Successfully installed cached-property-1.2.0 haralyzer-1.4.3

I used one online free tool to create a test.har file.
I put this file under Python3.4 folder and I test it.
The script I used is this:

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import json
from haralyzer import HarParser, HarPage
 
with open('test_dev.har', 'r') as f:
    har_parser = HarParser(json.loads(f.read()))
 
print (har_parser.browser)
# {u'name': u'Firefox', u'version': u'25.0.1'}
 
for page in har_parser.pages:
    assert isinstance(page, HarPage)

And this is the output of this script :

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C:\Python34&gt;python.exe har_test.py
{'version': '39.0.3', 'name': 'Firefox'}

Posted in All, Programming, Python. Tagged with , , , , , .

Two python modules : MoviePy and images2gif – part 001 .

07/06/2015 by admin · Leave a comment

MoviePy is a Python module for video editing, which can be used for basic operations (like cuts, concatenations, title insertions), video compositing (a.k.a. non-linear editing), video processing, or to create advanced effects. It can read and write the most common video formats, including GIF.
Read about this module here .
… this module let you to working with GIF image files.
Read abouth this python module here .

I used the python 3.4 version with pip3.4.
Test the pip3.4 with :
C:\Python34\Scripts>pip3.4.exe install --upgrade pip
Requirement already up-to-date: pip in c:\python34\lib\site-packages

Then install the python modules with :
C:\>cd Python34
C:\Python34>cd Scripts
C:\Python34\Scripts>pip3.4.exe install MoviePy
You are using pip version 7.0.1, however version 7.0.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Collecting MoviePy
Downloading moviepy-0.2.2.11.tar.gz (107kB)
100% |################################| 110kB 1.2MB/s
Requirement already satisfied (use --upgrade to upgrade): numpy in c:\python34\l
ib\site-packages (from MoviePy)
Requirement already satisfied (use --upgrade to upgrade): decorator in c:\python
34\lib\site-packages (from MoviePy)
Collecting imageio (from MoviePy)
Downloading imageio-1.2.tar.gz (120kB)
100% |################################| 122kB 1.3MB/s
Collecting tqdm (from MoviePy)
Downloading tqdm-1.0.tar.gz
Building wheels for collected packages: MoviePy, imageio, tqdm

and …

C:\Python34\Scripts>pip3.4.exe install images2gif
You are using pip version 7.0.1, however version 7.0.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Collecting images2gif
Downloading images2gif-1.0.1.tar.gz
Building wheels for collected packages: images2gif
Running setup.py bdist_wheel for images2gif

Posted in All, Programming, Python. Tagged with , , , .

PySide – Introduction – part 003

09/05/2015 by admin · Leave a comment

I make another tutorial named – PySide – Introduction – part 003.
The main reason come from my opption to share some basic actions and fix some issue when you try to learn PySide and all python submodules.
This is the default script:

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import sys
import PySide
from PySide.QtGui import *
from PySide.QtCore import *
 
class MyWidget(QWidget):
  def __init__(self):
    QWidget.__init__(self)
    
    self.roiDial = QDial()
    self.roiDial.setNotchesVisible(True)
    self.roiDial.setMaximum(15)
    self.roiDial.setMinimum(1)
    self.roiDial.setValue(1)
    self.myGridLayout = QGridLayout()
    self.myGridLayout.addWidget(self.roiDial, 0, 0)
 
    self.setLayout(self.myGridLayout)
    self.setWindowTitle("The title of window !!!")
 
if __name__ =='__main__':
 
    myApp = QApplication(sys.argv)
    myWidget = MyWidget()
    myWidget.show()
    myApp.exec_()
    sys.exit(0)

The first part of this script come with importing python modules.
Also I have a python class named : MyWidget.
In this class I used the QDial and this will make one round slider with 15 lines, and all settings.

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    self.roiDial = QDial()
    self.roiDial.setNotchesVisible(True)
    self.roiDial.setMaximum(15)
    self.roiDial.setMinimum(1)
    self.roiDial.setValue(1)

The window application need to be set with one QGridLayout. This will set one grid and the QDial will put over this grid.

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    self.myGridLayout = QGridLayout()
    self.myGridLayout.addWidget(self.roiDial, 0, 0)
 
    self.setLayout(self.myGridLayout)

You can search over internet about QGridLayout and QDial property and methods.
Let’s see this in action.
QDial_free-tutorials_003
You can apply your custom style:

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import sys
import PySide
from PySide.QtGui import *
from PySide.QtCore import *
 
class MyWidget(QWidget):
  def __init__(self):
    QWidget.__init__(self)
    self.roiDial = QDial()
    self.roiDial.setStyleSheet("QDial{ background-color: QLinearGradient(spread:pad, x1:0.683, y1:1, x2:1, y2:0, stop:0 rgba(103, 103, 103,255), stop:1 rgba(144, 144, 144, 255)); }")
    self.roiDial.setNotchesVisible(True)
    self.roiDial.setMaximum(9)
    self.roiDial.setMinimum(1)
    self.roiDial.setValue(3)
    self.roiDial2 = QDial()
    self.myGridLayout = QGridLayout()
    self.myGridLayout.setSpacing(10)
    self.myGridLayout.addWidget(self.roiDial, 0, 0)
 
    self.myGridLayout.addWidget(self.roiDial2, 0, 1)
    self.setLayout(self.myGridLayout)
    self.setGeometry(100, 100, 300, 150)
    self.setWindowTitle("A simple QDial !")
 
if __name__ =='__main__':
    myApp = QApplication(sys.argv)
    myWidget = MyWidget()
    myWidget.show()
    myApp.exec_()
    sys.exit(0)
 

QDial_free-tutorials_001
I need to put two QDial and use some simple style :

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self.roiDial.setStyleSheet

I will come also with another tutorial about setStyleSheet.

Posted in All, Programming, Python. Tagged with , , , .
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