missing_buckets = [x in timebuckets if ((x not in found_tenors) and (x == '1y' or x[-1] != 'y'))]
エラーが発生します:
missing_buckets = [x in timebuckets if ((x not in found_tenors) and (x == '1y' or x[-1] != 'y'))]
^
SyntaxError: invalid syntax