def remove_custom_binding(self, key_name, needs_prefix=False):
k = (needs_prefix, key_name)<EOL>if k in self.custom_bindings:<EOL><INDENT>self.custom_key_bindings.remove(self.custom_bindings[k].handler)<EOL>del self.custom_bindings[k]<EOL><DEDENT>
Remove custom key binding for a key.

:param key_name: Pymux key name, for instance "C-A".