Usage

How to installing the package

Install the project into your Python environment:

$ pip install pythonic-fp-booleans

Importing the module

Import package booleans classes, functions and constants into your code.

from pythonic_fp.booleans.subtypable SBool, snot, TRUTH, LIE

from pythonic_fp.booleans.subtypes.flavored FBool, truthy, falsy

from pythonic_fp.booleans.subtypes.truthy_falsy TF_Booleans
from pythonic_fp.booleans.subtypes.truthy_falsy TF_Bool, T_Bool, F_Bool
from pythonic_fp.booleans.subtypes.truthy_falsy ALWAYS, NEVER_EVER

Best practices

Subtypable Booleans

• use the ~ to return the same SBool subtype but of the opposite truthiness

  • Python’s not operator always returns a bool

• constants TRUTH and LIE are the unique truthy and falsy SBool values

Flavored Booleans

• functions truthy and falsy take any hashable value called its flavor

• they return the unique truthy or falsy FBool respectively of that flavor

Truthy_Falsy Booleans

• use TF_Booleans = T_Bool | F_Bool | TF_Bool only as a type

• directly use T_Bool, F_Bool, TF_Bool as the type constructors

• constants ALWAYS and Never are the unique TS_Bool truthy and falsy values

  • but they are distinct subtypes of TS_Bool

    • for TS_Bool we have

      • type(ALWAYS) is T_Bool

      • type(NEVER) is F_Bool

    • while for bool we have

      • type(True) is bool

      • type(False) is bool