How can I get the selected value of a combobox (and store it in a variable)?

Clash Royale CLAN TAG#URR8PPPHow can I get the selected value of a combobox (and store it in a variable)?
I've been wondering how can I get the current value of a combobox (not the current()) and preferably store it to my variable 'listvalue'. I've been searching for a while but never found anything that I wanted.
Here's the sample code:
FontList1['values'] = ("Courier","Courier New","Times New Roman","Comic Sans MS")
FontList1.set(TypeFace)
print(listvalue)
FontList1.pack(side="right")
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