[root@binger ~]# yum -y install tkinter  tcl-devel tk-devel

[root@binger ~]# rpm -qa | grep ^tk

tkinter-2.7.-.el7_6.x86_64

tk-devel-8.5.-.el7.x86_64

tk-8.5.-.el7.x86_64

[root@binger ~]# rpm -qa | grep ^tcl

tcl-8.5.-.el7.x86_64

tcl-devel-8.5.-.el7.x86_64

[root@binger ~]# find /usr -name *tkinter.so

[root@binger ~]#

[root@binger ~]# yum -y install python36-tkinter  tcl-devel tk-devel

[root@binger ~]# rpm -qa | grep ^tk

tkinter-2.7.-.el7_6.x86_64

tk-devel-8.5.-.el7.x86_64

tk-8.5.-.el7.x86_64

[root@binger ~]# rpm -qa | grep ^tcl

tcl-8.5.-.el7.x86_64

tcl-devel-8.5.-.el7.x86_64

[root@binger ~]# find /usr -name *tkinter.so

[root@binger ~]#

[root@binger ~]# yum search tkinter

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 packages excluded due to repository protections

============================================================================================================================ N/S matched: tkinter ============================================================================================================================

python34-tkinter.x86_64 : A GUI toolkit for Python

python36-tkinter.x86_64 : A GUI toolkit for Python

tkinter.x86_64 : A graphical user interface for the Python scripting language

  Name and summary matches only, use "search all" for everything.