in src/stepfunctions/inputs/placeholders.py [0:0]
def _join_path(self, path):
subscript_list = []
for i in path:
if isinstance(i, str):
subscript_list.append("['{}']".format(i))
elif isinstance(i, int):
subscript_list.append('[{}]'.format(i))
return "".join(subscript_list)