PyQT5 绑定函数的传参（connect 带参数）

使用PyQt编程过时，经常会遇到给槽函数传递自定义参数的情况。

采用 lamda：

示例1

self.but1.clicked.connect(lambda: self.mySlot(1))
self.but2.clicked.connect(lambda: self.mySlot(2))

def mySlot(self, param):
    if param == 1:
        ...
    elif param == 2:
        ...

示例2

def connections(self):
    my_button.clicked.connect(lambda checked: self.on_button(checked, 'hi'))

def on_button(self, checked, message):
    print checked, message   # prints "True, hi"

采用 functools

# imports the functools module
import functools 

def connections(self):
    my_button.clicked.connect(functools.partial(self.on_button, 'hi'))

def on_button(self, message, checked):
    print checked, message   # prints "True, hi"

REF

https://www.jianshu.com/p/588a7384bbb3

https://zhuanlan.zhihu.com/p/371042469