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# Development
Notes on how to develop guizero (on Windows).
## Setup
Upgrade pip:
```
python.exe -m pip install pip --upgrade
```
Install / upgrade pre-requisites:
```
pip install mkdocs wheel twine virtualenv pytest pillow --upgrade
```
## Python library
Create a virtual environment (not essential, but a good idea!):
```
virtualenv guizero-[versionno]
cd guizero-[versionno]
```
Activate your virtual environment:
```
Scripts\activate
```
Checkout and install guizero for development:
```
git clone https://github.com/lawsie/guizero
cd guizero
git checkout dev
python setup.py develop
```
When you have finished your development, deactivate your virtual environment:
```
Scripts\deactivate
```
## Tests
To run the automated tests:
```
cd guizero\test
pytest -v
```
If running the tests inside a virtual environment you will need to install pytest in that virtual environment.
```
pip install pytest
```
_Note - tkinter can error when running the tests usually when the interpreter doesn't start properly, it doesn't seem to like being initialised and destroyed hundreds of times, I suspect a file locking issue as you don't see the problem on Linux. So sometimes you might get a test fail with an error like `This probably means that tk wasn't installed properly.`. Just re-run the last failed errors! `pytest --lf -v`_
## Documents
Test documents by serving up MkDocs:
```
cd guizero\docs-src
mkdocs serve
```
Open [http://127.0.0.1:8000/](http://127.0.0.1:8000/)
|
