The app has started crashing after launching.

[polychromous]

When I open a JavaScript file with a very long line, the app crashes. Also, because of Pythonista’s feature that opens the last file you had open when you launch the app, Pythonista tries to open this file and crashes without doing anything.
Currently, I am unable to use Pythonista.

[mmccthomas]

In the Apps section of Settings, find Pythonista and switch Safe Mode.
When Pythonista is loaded next it will not load the previous tabs.

Pythonista will do the same when trying to open very large JSON files.
You can view files with quicklook
import console
console.quicklook(‘large_file.txt’)