Difference between revisions of "Python"
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Since Python version 2.7 has reached end of life since January first 2020, this version is no longer installed on the PCs in the labs. Standard is now: Python 3.7 64-bits. | Since Python version 2.7 has reached end of life since January first 2020, this version is no longer installed on the PCs in the labs. Standard is now: Python 3.7 64-bits. | ||
If you still have scripts written in Python2, the scripts should be upgraded to Python 3. Most changes are probably the print statements. Print statements should always have parentheses: print('some text') | If you still have scripts written in Python2, the scripts should be upgraded to Python 3. Most changes are probably the print statements. Print statements should always have parentheses: print('some text') | ||
Revision as of 16:03, 21 January 2021
 | |
| Installed version | 2.7.9 |
|---|---|
| Development status | Active |
| Written in | Python |
| Website | python.org |
Python is a general-purpose, high-level programming language. It is also a type of snake and it is also a rollercoaster, but one is arguably more relevant to your research than the others.
Python on the labcomputers
Since Python version 2.7 has reached end of life since January first 2020, this version is no longer installed on the PCs in the labs. Standard is now: Python 3.7 64-bits.
If you still have scripts written in Python2, the scripts should be upgraded to Python 3. Most changes are probably the print statements. Print statements should always have parentheses: print('some text')
Key differences between Python 2 and Python 3 are here: https://sebastianraschka.com/Articles/2014_python_2_3_key_diff.html
Psychopy 2020.2.10 has been installed in the root of the Python3.7 64-bit version. This is also the default version when 'psychopy' is typed from the command prompt. It is also the default that opens when a .py file is double-clicked. It also can be started by clicking the appropriate icon on the desktop. There is also a Psychopy 2020.2.10 installed on Python3.6 32-bits. This version has its own icon on the desktop and should be used when you are using a TOBII Eyetracker.
When your script fails to load in Psychopy, because you need packages that are not installed on our labcomputers, please contact TSG.
On the labcomputer, there is support for Spyder, PyCharm and Psychopy.
The information below is outdated
Installation
Windows (32 bit)
- Download the Win32 installer
- Double-click on the executable and follow the steps on your screen.
Configuration
Windows Environment Variables
Computer --> Properties --> Advanced settings --> Environment Variables.
Add the following Path:
C:\Python27;C:\Python27\Lib\site-packages\;C:\Python27\Scripts\;
Package Management
pip
After Python is installed, you can use pip to install your required packages. pip is included with Python 2.7.9 or greater. For older versions, use the following steps to install:
- Download get-pip.py
- Execute get-pip by entering the following command:
python get-pip.py
To install a package, simply execute the following command: c:\pip install PACKAGE_NAME
Replace PACKAGE_NAME with the name of the package of choice.
Note: By default, packages are installed in the following folder (Windows):
C:\Python27\Lib\site-packages
This location may differ if you have installed Python somewhere else.
Setuptools
For package management with setuptools, install setuptools using the following command: pip install -U setuptools
To install a package, simply execute the following command: c:\easy_install PACKAGE_NAME
Replace PACKAGE_NAME with the name of the package of choice.
List of Python Packages
| Python Library | Description | Installed | Installer Type | URL |
|---|---|---|---|---|
| PIL | Python Image Library | Yes | Package Manager | http://www.pythonware.com/products/pil/ |
| SciPy | Python-based ecosystem of open-source software for mathematics, science, and engineering. | Yes | Package Manager | http://www.scipy.org/install.html |
| PyWin32 | Python Extensions for Windows | Yes | Windows Installer | http://sourceforge.net/projects/pywin32/files/pywin32/ |
| PySerial | Serial access for Python | Yes | Windows Installer | https://pypi.python.org/pypi/pyserial |
| wxPython | GUI Toolkit for Python | Yes | Windows Installer | http://www.wxpython.org/download.php#msw |
| matplotlib | 2D plotting library for Python | Yes | Windows Installer | http://matplotlib.org/downloads.html |
| pyo | dedicated Python module for digital signal processing | Yes | Windows Installer | http://ajaxsoundstudio.com/software/pyo/ |
| Opencv2 | Open Source Computer Vision is a library of programming functions mainly aimed at real-time computer vision | Yes | Windows Installer | http://opencv.org/ |
| PyQt | Python binding of the cross-platform GUI toolkit Qt | Yes | Windows Installer | http://www.riverbankcomputing.co.uk/software/pyqt/download5 |
| PyQtGraph | Scientific Graphics and GUI Library for Python | Yes | Windows Installer | http://www.pyqtgraph.org/ |
| LXML | library for processing XML and HTML in the Python language | Yes | Package Manager | http://lxml.de/ |
| PyGame | Pygame is a set of Python modules designed for writing games. | Yes | Windows installer | http://pygame.org/news.html |
| PANDAS | Python Data Analysis Library | Yes | Package Manager | http://pandas.pydata.org/ |
| Expyriment | A Python library for congnitive and neuroscientific experiments. | Yes | Package Manager | http://www.expyriment.org/ |
| Pyparse | Parse text files in an easier and more maintainable manner | Yes | Package Manager | https://pypi.python.org/pypi/PyParse/1.1.7 |
| AVbin | media decoding/decompression library | Yes | Windows Installer | https://code.google.com/p/avbin/ |
| Pyglet | a cross-platform windowing and multimedia library for Python. | Yes | Manual Install | File:Pyglet-1.1.4.zip |
| FreeType | Library to Render Fonts | Yes | Manual Install | File:Freetype.zip |
| Psignifit | ||||
| Psychopy | Psychology Software in Python | Yes | Package Manager | http://www.psychopy.org |
For Psychopy dependancies, check the Psychopy page.
Windows Handlers
Check the Handlers by opening the Windows registry editor.
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\Python.CompiledFile\shell\open\command]
@="\"C:\\Python27\\python.exe\" \"%1\" %*"
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\Python.File\shell\open\command]
@="\"C:\\Python27\\python.exe\" \"%1\" %*"
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Python.CompiledFile\shell\open\command]
@="\"C:\\Python27\\python.exe\" \"%1\" %*"
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Python.File\shell\open\command]
@="\"C:\\Python27\\python.exe\" \"%1\" %*"
Python DLL Files
- C:\Python27\DLLs\
- Path Within the script.
- C:\Windows\System32 or
- C:\Windows\SysWOW64
Usage
Example: TestArgs.py
Execute the following script within the commandline (CMD): python testArgs.py a.
You should see the following result:
number of argument: 2
argv[0]: ./testArgs.py
argv[1]: a