IceSpringRealOptional

from IceSpringRealOptional import Option

option = Option.ofNullable("CommonSense")
print("{}: isPresent={}".format(option, option.isPresent()))
print("{}: value={}".format(option, option.get()))
option.ifPresent(lambda x: print(f"{x} exist"))
print("{}'s length: {}".format(option, option.map(len)))

empty = Option.empty()
print(empty.orElse("{} is empty".format(empty)))
print(empty.orElseGet(lambda: "{} is empty again".format(empty)))

try:
    Option.empty().orElseThrow(lambda: RuntimeError("Unlucky"))
except RuntimeError as e:
    print("Runtime error caught: {}".format(e))

<Option:CommonSense>: isPresent=True
<Option:CommonSense>: value=CommonSense
CommonSense exist
<Option:CommonSense>'s length: <Option:11>
<Option:None> is empty
<Option:None> is empty again
Runtime error caught: Unlucky