The problem I've noticed is that if I append the file with each of the 100k runs (one at a time), it can happen that two threads try to save to the file at the same time and some row(s) end up empty.

In short, each line represents ... is how to write to a file in Python! If you’re enjoying learning Python, then why not take your education to the next level? We’ve compiled a list of the ...

How to write four million lines of Python: Lessons from Dropbox on using ... via incremental checking — only checking modified files and their dependencies, developing a mypy daemon with various ...