python in a bash coproc

[10:36|~]
$ coproc python -i
[1] 81872
[10:36|~]
$ Python 3.7.4 (default, Oct  4 2019, 06:57:26)
[GCC 9.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>
[10:36|~]
$ echo -e "print('$(date)')\n" >&${COPROC[1]}
>>> >>> [10:37|~]
$ echo -e "print('$(date)')\n" >&${COPROC[1]}
>>> >>> [10:37|~]
$ cat <&${COPROC[0]}
Wed 20 Nov 2019 10:37:06 AM CET
Wed 20 Nov 2019 10:37:07 AM CET
^C
[10:37|~]
$ echo -e "print('$(date)')\n" >&${COPROC[1]}
>>> >>> [10:37|~]
$ cat <&${COPROC[0]}
Wed 20 Nov 2019 10:37:15 AM CET
^C