How to handle widget events using PyQt signal and slot mechanism

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Here we have tried a signal-slot link The aim of these two lines of code is when the button is pressed the text of the label

signal operating circuit between the slot coil and the motor When the signal lever is in the normal position , the indication wire is connected to the 〇: Can be installedoperates within the signal range of the expansion slot; ×: Cannot be installeddoes not function PCI Express bus

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