contextif: run the function only in a specific context

Sometimes we may need to run a function only if it happens in a strictly defined context. In this case, we can use this mini library.

Install it:

pip install contextif

And use:

from contextif import state

with state:
    state(print, 'hello,', 'world!')  # It will be printed.

state(print, "it's me, Mario!")  # It won't.

Using state as a function, you can pass another function and arguments to it there. It will be called only if it happens in a context created also using state. The function will not be called out of context.

For convenience, after the first import of state, this variable becomes builtin and you can access it in other modules of your program without importing.