Setup

The first thing we do in this video is start a new virtual environment.

python3.7 -m venv venv
source venv/bin/activate

This command uses the venv module to create a new folder called venv. After it is created we source it. This way we can work on our project without having to worry about other projects. If this is unfamiliar territory for you, feel free to review our series on virtual environments.

Next we create our project folder clumper. The __init__.py file inside of the clumper folder is empty but the contents of the clump.py file is:

class Clumper:
    def __init__(self, blob):
        self.blob = blob

    def keep(self, *funcs):
        data = self.blob
        for func in funcs:
            data = [d for d in data if func(d)]
        return Clumper(data)

    def head(self, n):
        return Clumper([self.blob[i] for i in range(n)])

    def tail(self, n):
        return Clumper([self.blob[-i] for i in range(1, n+1)])

    def select(self, *keys):
        return Clumper([{k: d[k] for k in keys} for d in self.blob])

    def mutate(self, **kwargs):
        data = self.blob
        for key, func in kwargs.items():
            for i in range(len(data)):
                data[i][key] = func(data[i])
        return Clumper(data)

    def sort(self, key, reverse=False):
        return Clumper(sorted(self.blob, key=key, reverse=reverse))

The contents of the setup.py file in this video is:

from setuptools import setup, find_packages

setup(
    name="clumper",
    version="0.1.0",
    packages=find_packages(),
)

With all these files set up we can install the package in our virtual environment. You can use this pip command to achieve that:

python -m pip install -e .

Again, if this is unfamiliar territory for you, feel free to review our series on virtual environments.