[PyQt] 'clicked' parameter in QPushButton's constructor

[Zhao Lee]

While if I replace 
button = QPushButton("Click me",clicked=say_hello)
with 
button = QToolButton(triggered=say_hello)
then the slot won't be called , why ?







At 2019-05-08 16:51:31, "Phil Thompson" <phil at riverbankcomputing.com> wrote:
>On 08/05/2019 09:07, Zhao Lee wrote:
>> I can connect slot to QPushButton's clicked signal in its constructor 
>> this way
>> button = QPushButton("Click me",clicked=say_hello)
>> It worked ! Test example as following:
>> 
>> 
>> import sys
>> from PyQt5.QtWidgets import *
>> def say_hello():
>>     print("Button clicked, Hello!")
>> # Create the Qt Application
>> app = QApplication(sys.argv)
>> # Create a button, connect it and show it
>> button = QPushButton("Click me",clicked=say_hello)
>> # button = QToolButton("Click me", clicked=say_hello)
>> # button.clicked.connect(say_hello)
>> button.show()
>> # Run the main Qt loop
>> app.exec_()
>> 
>> 
>> However , there seems no parameter named 'clicked' in QPushButton's
>> constructor as described in the doc  , what's the working mechanism
>> behind ? How do I know which parameters I could pass to the
>> constructor?
>
>https://www.riverbankcomputing.com/static/Docs/PyQt5/signals_slots.html#connecting-signals-using-keyword-arguments
>
>Phil
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