Articles, notes and random thoughts on Software Development and Technology
Given typical JSON of car models like this:
json_data = """{
"cars": [
{
"manufacturer": "ford",
"model": "mondeo"
},
{
"manufacturer": "vauxhall",
"model": "corsa"
}
]
}"""
To filter matching cars by manufacturer in Python, use:
result = [car for car in json_data['cars'] if(car['manufacturer'] == "ford")]
Discussed in answers here.
To document individual functions in Python, use a docstring like this:
def example_function():
"""Performs xyz
More details here
"""
Discussed in answers here.
Flask by default runs on port 8000. To run on a different port use:
python3 -m flask --app your-flask-app run -p 3000
From here.
External python dependencies can be installed with pip, and managed as a list of dependencies for your project with a requirements.txt file. To install dependencies for a project, use:
> python3 -m pip install -r requirements.txt
On MacOS, it’s no longer possible to install global modules, unless you force the install with the ‘–break-system-packages’ option, if you pip like above, you’ll see the error:
error: externally-managed-environment
× This environment is externally managed
Instead, create a virtual environment for your project where dependencies local to your project are installed:
> python3 -m venv .venv
> source .venv/bin/activate
Now you can run pip install and all dependent modules will be installed beneath .venv in your project folder.