Create lark/grammars/__init__.py

[chanicpanic]

lark.grammars is declared as a package in setup.py, but lark/grammars is missing an __init__.py.

Without it, attempting something like Lark.open_from_package("lark.grammars", "lark.lark") fails.

[erezsh]

Thanks!

Just fyi, what I usually do is Lark.open_from_package("lark", "grammars/lark.lark")

But there's no harm in having it both ways.