asf_search library import error

[hemengul]

hİ,
when ı am trying to import asf serach library on jupyter notebook, ı write "import asf_search as asf" then i receive this error:

"File "/home/selmaacar/anaconda3/lib/python3.7/site-packages/asf_search/ASFSearchOptions/ASFSearchOptions.py", line 4, in
from .validator_map import validator_map, validate

File "", line 1
(key=)
^
SyntaxError: invalid syntax"
Could you please help me, what is wrong with asf_search library?