MetroFramework to Iron Python
download 3 DLL
https://yadi.sk/d/SGaxeVeH3JSadx
and unpack 7zip to D:\MetroFramework (or another)
add code below to your script:
import sys
sys.path.append(r'D:\MetroFramework')
clr.AddReference('MetroFramework')
import MetroFramework.Forms.MetroForm as mForm
change attribute class (mForm)
good luck