deepcopy in py3k evaluates interpolated strings #188
Description
Consider the following code example:
from __future__ import print_function
from copy import deepcopy
from configobj import ConfigObj
conf = ConfigObj()
conf['foo'] = 'bar'
conf['baz'] = '%(foo)s.txt'
conf_new = deepcopy(conf)
conf_new['foo'] = 'abc'
print(conf_new['bar'])
In python 2.7, the output is "abc.txt". In python 3.7, the output is 'bar.txt', which is the value of the 'bar' key in the original config object.