Argument 1 has unexpected type 'NoneType'? - python

I have a problem with my PyQt button action. I would like to send a String with the Function but I got this Error:
TypeError: argument 1 has unexpected type 'NoneType'
import sys
from PyQt5.QtWidgets import QApplication, QPushButton, QAction
from PyQt5.QtCore import QObject, pyqtSignal
from PyQt5.QtGui import *
from PyQt5.uic import *
app = QApplication(sys.argv)
cocktail = loadUi('create.ui')
def mixCocktail(str):
cocktail.show()
cocktail.showFullScreen()
cocktail.lbl_header.setText(str)
widget = loadUi('drinkmixer.ui')
widget.btn_ckt1.clicked.connect(mixCocktail("string"))
widget.show()
sys.exit(app.exec_())


As suggested by user3030010 and ekhumoro it expects a callable function. In which case you should replace that argument with lambda: mixCocktail("string")
AND ALSO don't use str it's a python built-in datatype I have replaced it with _str
import sys
from PyQt5.QtWidgets import QApplication, QPushButton, QAction
from PyQt5.QtCore import QObject, pyqtSignal
from PyQt5.QtGui import *
from PyQt5.uic import *
app = QApplication(sys.argv)
cocktail = loadUi('create.ui')
def mixCocktail(_str):
cocktail.show()
cocktail.showFullScreen()
cocktail.lbl_header.setText(_str)
widget = loadUi('drinkmixer.ui')
widget.btn_ckt1.clicked.connect(lambda: mixCocktail("string"))
widget.show()
sys.exit(app.exec_())
More about lambda functions: What is a lambda (function)?


instead of this
widget.btn_ckt1.clicked.connect(mixCocktail("string"))
write
widget.btn_ckt1.clicked.connect(lambda:mixCocktail("string"))

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