Le 28/08/11 15:11, bluekyu a écrit :
Hello.
I have a question about "partial" and "lambda" in connect slot.
I learned that "partial" and "lambda" can have arguments in
connect slot.
So, I usually use lambda function, however, it does not work well
in some code.
My example code:
--------------------------------------------
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import sys
from functools import partial
app = QApplication(sys.argv)
form = QDialog()
layout = QVBoxLayout()
label = QLabel("Test")
layout.addWidget(label)
stringList = ["ABC", "123", "XYZ", "789"]
for string in stringList:
button = QPushButton(string)
layout.addWidget(button)
form.connect(button, SIGNAL("clicked()"),
# lambda: label.setText(string)) # Problem
partial(label.setText, string))
form.setLayout(layout)
form.show()
app.exec_()
---------------------------------------------
I expected that each button set label text as each string, but all
button set label text as "789".
Instead, partial function works very well.
What is difference between "partial" and "lambda"?
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Your's lambda function is not correct.
Use this:
form.connect(button, SIGNAL("clicked()"),
lambda s=string: label.setText(s))
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