Argue

Usage

Set options, bounds, and conditions for your functions and methods!

Instead of having to write bounds checks within a function and clutter up the function itself, set the bounds in a simple decorator and keep your logic clean:

    import argue
    
    @argue.bounds(first=(0, 5), second=(6, 10))
    def limited_add(first, second):
        return first + second

Replaces:

    def limited_add(first, second):
        if 0 > first or first > 5:
            raise ValueError(...)
        elif 6 > second or second > 10:
            raise ValueError(...)
        else:
            return first + second

Set the available options for a given input:

    import argue
    
    @argue.options(length=('short', 'long'))
    def select(length):
        return f"This took a {length} time"

Replaces:

    def select(length):
        if length not in ('short', 'long'):
            raise ValueError(...)
        else:
            return f"This took a {length} time"

Finally, set conditions for methods:

    import argue
    
    class ConditionalClass:
        a = False
        
        def do_first(self):
            self.a = True
            
        @argue.conditional(a=True)
        def do_second(self):
            pass

argue will look up the class attribute a for the condition before proceeding with the method.

Note that conditional only works on methods, not functions.

Installation

    pip install argue

FAQ

Is this a replacement for typing?

No, this does not check types. It's only for limiting input.

Is this a type-checker?

No, that would be unPythonic. This allows you and your users to have descriptive and helpful error messages when the input is not what it should be.