CentOS 7 View Firewall error (resolved, previously installed Python3)

[Email protected] ~]# service FIREWALLD restart
Redirecting To/bin/systemctl restart Firewalld.service
Job for Firewalld.service failed because the control process exited with error code. See "Systemctl Status Firewalld.service" and "Journalctl-xe" for details.
[Email protected] ~]# Systemctl firewalld restart
Unknown operation ' Firewalld '.
[[Email protected] ~]# service FIREWALLD stop
Redirecting To/bin/systemctl Stop Firewalld.service
[[Email protected] ~]# service FIREWALLD start
Redirecting To/bin/systemctl start Firewalld.service
Job for Firewalld.service failed because the control process exited with error code. See "Systemctl Status Firewalld.service" and "Journalctl-xe" for details.
[Email protected] ~]# systemctl status firewall
Unit Firewall.service could not being found.
[Email protected] ~]# Firewall-cmd--state
Traceback (most recent):
File "/usr/bin/firewall-cmd", line, in <module>
From gi.repository import GObject
Modulenotfounderror:no module named ' GI '

The above hint mentions "/usr/bin/firewall-cmd", we enter the following command:

Vim/usr/bin/firewall-cmd

Modify the first line and add the number 2.7 after Python:

Save to exit

CentOS 7 View Firewall error (resolved, previously installed Python3)