Hi, I would just like to add a side note on this:

The library fn.py implements a class called _Callable, which gives a shorter notation for lambdas, using an underscore ( _ ), instead of declaring parameters (for example, map(_ + 1, range(10)) is the same as map(lambda n: n + 1, range(10)) ). In addition to the regular arithmetic operators, it supports the __getattr__ method. (for instance _.y is the same as lambda a: a.y)

Therefore, you do not override the general syntax of Python (other than the fact that you cannot use the code

for i, _ in some_iterable:               # don’t use, at the end of the loop, fn._ has disappeared from the scope of the module
        do_something(i)

)

Personally, I would propose the adoption of the _ in some standard library module (e.g., functools) rather than overriding the “from” syntax if the simplification of lambdas in a goal. (Personal I find the _ much more user-friendly)

- Ed M