pyjoptional 1.1.1

A Python module providing `PyOptional`, a Java-like `Optional` type for Python 3.9+.

PyJOptional

A Python module providing the PyOptional class/type, a Java-like Optional wrapper for Python values.

HOWTO

user@machine:~$ pip install pyjoptional

from pyoptional.pyoptional import PyOptional

p: PyOptional[int] = PyOptional.of(1)
p1: PyOptional = PyOptional.of_nullable(None)
p2: PyOptional = PyOptional.empty()

Comparison with the Java Optional

• PyOptional.of() corresponds to Optional.of().
• PyOptional.of_nullable() corresponds to Optional.ofNullable().
• PyOptional.empty() corresponds to Optional.empty().
• PyOptional.is_empty() corresponds to Optional.isEmpty().
• PyOptional.is_present() corresponds to Optional.isPresent().
• PyOptional.filter() corresponds to Optional.filter().
• PyOptional.get() corresponds to Optional.get().
• PyOptional.or_else() corresponds to Optional.orElse().
• PyOptional.or_else_get() corresponds to Optional.orElseGet().
• PyOptional.or_else_raise() corresponds to Optional.orElseThrow() (both with and without a supplied Exception).
• PyOptional.or_else_throw is an alias of Optional.or_else_raise.
• PyOptional.or_new_pyoptional() corresponds to Optional.or() (because or is a Python keyword).
• PyOptional.if_present() corresponds to Optional.ifPresent().
• PyOptional.if_present_or_else() corresponds to Optional.ifPresentOrElse().
• PyOptional.map() corresponds to Optional.map().
• PyOptional.flatMap() corresponds to Optional.flatMap().

Additionally, PyOptional.__eq__, PyOptional.__hash__, PyOptional.__str__, and PyOptional.__repr__ override the default Python implementation of such methods, much like the Java Optional.equals(), Optional.hashCode(), and Optional.toString() methods.

Finally, there is no correspondent of the Java Optional.stream() method, as Python has no native Stream class.

Comparison with the Python Optional

The native Python Optional[SomeType] type is just syntactic sugar for SomeType | None. Therefore, it does not provide any of the API methods of PyOptional.