Assign Default Value

Default value can be assigned by adding default args to assign() method.

from kwhelp import KwargsHelper
import kwhelp.rules as rules

class MyClass:
    def __init__(self, **kwargs):
        self._duration = "Long"
        kw = KwargsHelper(self, {**kwargs})
        kw.assign(key="speed", require=True, rules_all=[rules.RuleIntPositive])
        kw.assign(key="unit", default="MPH", rules_all=[rules.RuleStrNotNullOrEmpty])
        kw.assign(key="duration", default=self._duration,
            rules=[rules.RuleStrNotNullOrEmpty])

>>> myclass = MyClass(speed=123, unit="KPH")
>>> print(myclass._speed)
123
>>> print(myclass._unit)
KPH
>>> print(myclass._duration)
Long

>>> myclass = MyClass(speed=123, duration="Short")
>>> print(myclass._speed)
123
>>> print(myclass._unit)
MPH
>>> print(myclass._duration)
Short