Always lowercase entry in tkinter

[Larz60+]

make a method

def set_lower(self, event):
   zz.set(self.wordld.get().lower())

# replace line 6 with
self.world.bind("<KeyRelease>", set_lower)

there are other issues here:
the Entry widget cannot be same as StringVar
also you have some indentation issues.
and you will have to alter code above (set zz = to new StringVar nane), and textvariable part of entry.