[PyQt] Disconnects slot from signal

[iMath]

print(self.clipboard.dataChanged.disconnect()) 
#            print(self.clipboard.dataChanged.disconnect(self.detectUrl))  #
#            print(QObject.disconnect(self.clipboard, SIGNAL('dataChanged()'),self.detectUrl))


I have tried the three,but only the uncommonted one worked,is there something wrong in  my code with ‍the other two?


 I think it would be better to let disconnect([slot]) in the New-style Signal and Slot return a bool value to hint if the connection is broken or not ,currently just return none‍

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