import json
import sys

foo = '{"My_string": "Foo bar.\\t Bar foo."}'
print(repr(json.loads(foo)))

foo = r'{"My_string": "Foo bar.\t Bar foo."}'
print(repr(json.loads(foo)))

print(repr(json.load(sys.stdin)))

foo_invalid = '{"My_string": "Foo bar.\t Bar foo."}'
try:
    json.loads(foo_invalid)
except ValueError:
   print("ok")
else:
   assert 0