dictionary - Python: Making a read-only property accessible via **vars(some_class) -

i use idiom '{var_name}'.format(**vars(some_class)).

however, when use property, cannot use properties value.

consider program:

#!/usr/bin/env python  class foo(object):     def __init__(self):         self._bar = none         self.baz = 'baz here'      @property     def bar(self):         if not self._bar:             # calculate value...             self._bar = 'bar here'         return self._bar  if __name__ == '__main__':     foo = foo()      # works:     print('{baz}'.format(**vars(foo)))      # gives: keyerror: 'bar'     print('{bar}'.format(**vars(foo))) 

question:

is there way make properties value accessible via **vars(some_class)?

short answer: no, it's not possible use .format(**vars(object)) want, since properties not use __dict__ , vars documentation:

vars(...)

vars([object]) -> dictionary

• without arguments, equivalent locals().
• with argument, equivalent object.__dict__.

however can achieve want using different format specifiers, example attribute lookup:

in [2]: '{.bar}'.format(foo()) out[2]: 'bar here' 

note have add leading . (dot) names , want.

---

side note: instead of using .format(**vars(object)) should use format_map method:

in [6]: '{baz}'.format_map(vars(foo())) out[6]: 'baz here' 

calling format_map dict argument equivalent calling format using ** notation, more efficient, since doesn't have kind of unpacking before calling function.