pd3f-core

pd3f-core was the Python package at the heart of pd3f 0.x: it rebuilt the continuous text from the output of Parsr. Since pd3f 1.0 it is part of pd3f, and the PyPI package pd3f contains the whole pipeline:

pip install pd3f

from pd3f import extract, output

print(output.text(extract("letter.pdf")))

The repository pd3f-core is archived and keeps the code of the 0.x versions; pip install "pd3f<1" installs the last of them.