PsychoPy2 is an open-source software for creating behavioral experiments with precise control over stimuli timing and spatial presentation. It offers two interfaces: a Python scripting interface and a graphical Builder interface, allowing users to create experiments with minimal or no programming. The Builder interface enables users to design experiments visually, with the ability to insert Python code for flexibility. The software has evolved significantly over the past decade, adding features such as asynchronous hardware polling, better support for open science, and improved stimulus options. It is now used by tens of thousands of users monthly, with over 90 contributors to the codebase. PsychoPy is designed to be accessible to non-programmers, including undergraduate psychology students, while still offering the flexibility needed for professional research. The Builder interface allows users to create experiments graphically, with a flow diagram that controls the sequence of routines. It also includes a Code Component for executing arbitrary Python code at various points in the experiment. The software supports a wide range of stimuli, including images, text, movies, sounds, and shapes, and allows for dynamic updates to stimulus attributes on each screen refresh. PsychoPy is used by both educators and researchers, with the Builder interface being widely adopted in undergraduate teaching. It is also used by professional researchers for high-precision experiments. The software supports Python 2 and 3, and has a growing community of developers and users. It includes features such as ioHub for asynchronous hardware control, and supports a wide range of hardware, including eye trackers, keyboards, and mice. PsychoPy is an open-source project that promotes open science and reproducibility. It provides full source code and supports open file formats. The project has a strong community, with over 90 contributors to the codebase. The software is used in a variety of research areas, including psychology, neuroscience, and linguistics. It has received support from various organizations, including the Wellcome Trust, and has a growing online repository for experiments. The project is currently in the development of PsychoPy3, which will allow experiments to be run online and on mobile devices.PsychoPy2 is an open-source software for creating behavioral experiments with precise control over stimuli timing and spatial presentation. It offers two interfaces: a Python scripting interface and a graphical Builder interface, allowing users to create experiments with minimal or no programming. The Builder interface enables users to design experiments visually, with the ability to insert Python code for flexibility. The software has evolved significantly over the past decade, adding features such as asynchronous hardware polling, better support for open science, and improved stimulus options. It is now used by tens of thousands of users monthly, with over 90 contributors to the codebase. PsychoPy is designed to be accessible to non-programmers, including undergraduate psychology students, while still offering the flexibility needed for professional research. The Builder interface allows users to create experiments graphically, with a flow diagram that controls the sequence of routines. It also includes a Code Component for executing arbitrary Python code at various points in the experiment. The software supports a wide range of stimuli, including images, text, movies, sounds, and shapes, and allows for dynamic updates to stimulus attributes on each screen refresh. PsychoPy is used by both educators and researchers, with the Builder interface being widely adopted in undergraduate teaching. It is also used by professional researchers for high-precision experiments. The software supports Python 2 and 3, and has a growing community of developers and users. It includes features such as ioHub for asynchronous hardware control, and supports a wide range of hardware, including eye trackers, keyboards, and mice. PsychoPy is an open-source project that promotes open science and reproducibility. It provides full source code and supports open file formats. The project has a strong community, with over 90 contributors to the codebase. The software is used in a variety of research areas, including psychology, neuroscience, and linguistics. It has received support from various organizations, including the Wellcome Trust, and has a growing online repository for experiments. The project is currently in the development of PsychoPy3, which will allow experiments to be run online and on mobile devices.