isinstance("",str) breaks on Python2 after running futurize

[avim2809]

i have a very big project which i am trying to conver to py3 but keep it working on py2 in the meanwhile
after running futurize it breaks string type checks
from builtins import str
assert isinstance("s",str)

first can someone explains based on what futurize adds from builtins import str import ?

according to the documentation on your website (https://python-future.org/isinstance.html?highlight=isinstance#isinstance)
there would be no alternative but using unicode_literals to avoid this

but it doesnt make sense since everywere i read i see many against it

so bottom line is there a way to avoid this issue without unicode_literals

[ngie-eign]

@avim2809 : we ran into similar with our group -- the trick is to use six.string_types which will allow isinstance to check the string type properly.