Python problem

After i run it, it shows:

line 18, in __init__ self.initface=Frame(self.master) NameError: name 'Frame' is not defined

This is my original code:

class initface(): def __init__(self,master): self.master=master self.master.config() self.initface=Frame(self.master) self.initface.pack()

Can you help me to solve this