from .decorators import cached_property
[docs]
class LazyString:
"""Lazy string is a string, evaluated only by demand"""
[docs]
def __init__(self, value):
self._value = value
[docs]
@cached_property
def value(self):
return self._value()
def __str__(self):
return self.value
def __add__(self, other):
return LazyString(lambda: self.value + other)
def __iadd__(self, other):
if "value" in self.__dict__:
del self.__dict__["value"]
self.value = lambda: self.value + other
def __radd__(self, other):
return LazyString(lambda: other + self.value)
def __iter__(self):
return iter(self.value)
def __getattr__(self, name):
return getattr(self.value, name)