[BUG] run python script occur error message

Description
run python script occur error message

Setup

salt minion error message
2020-10-10 17:00:19,965 [salt.loaded.int.module.cmdmod:290 ][WARNING ][28010] Attempt to run a shell command with what may be an invalid shell! Check to ensure that the shell </usr/bin/python> is valid for this user. 2020-10-10 17:00:20,012 [salt.loaded.int.module.cmdmod:518 ][ERROR ][28010] Environment could not be retrieved for user 'root': stderr=u' File "<string>", line 1\n /usr/bin/python\n ^\nSyntaxError: invalid syntax\n' stdout=u''

Steps to Reproduce the behavior
salt "192.168.23.22" cmd.run "print 'hello'" shell="/usr/bin/python" runas=root group=root

Expected behavior

Screenshots

Versions Report

Salt Version:
           Salt: 3000.2

Dependency Versions:
           cffi: Not Installed
       cherrypy: Not Installed
       dateutil: Not Installed
      docker-py: Not Installed
          gitdb: Not Installed
      gitpython: Not Installed
         Jinja2: 2.10.3
        libgit2: Not Installed
       M2Crypto: 0.21.1
           Mako: Not Installed
   msgpack-pure: Not Installed
 msgpack-python: 0.6.2
   mysql-python: Not Installed
      pycparser: Not Installed
       pycrypto: 2.6.1
   pycryptodome: Not Installed
         pygit2: Not Installed
         Python: 2.7.5 (default, Apr  2 2020, 13:16:51)
   python-gnupg: Not Installed
         PyYAML: 3.10
          PyZMQ: 14.7.0
          smmap: Not Installed
        timelib: Not Installed
        Tornado: 4.5.3
            ZMQ: 4.1.4

System Versions:
           dist: centos 7.3.1611 Core
         locale: UTF-8
        machine: x86_64
        release: 3.10.0-514.el7.x86_64
         system: Linux
        version: CentOS Linux 7.3.1611 Core

Start by reproducing the reported salt cmd.run command with shell="/usr/bin/python" on the stated Salt 3000.2, Python 2.7.5, and CentOS 7 setup. Trace how cmd.run validates the shell and retrieves the root user's environment; the issue's missing expected behavior means the intended successful result must be clarified before work can be considered done.