理解说明
如下内容很好，建议阅读。
A PyQt button event can be connected in the normal way to a function so that the function receives the default signal arguments (in this case the button checked state):
def connections(self):
my_button.clicked.connect(self.on_button)
def on_button(self, checked):
print checked # prints "True"
Or, the default signal arguments can be overridden using lambda:
def connections(self):
my_button.clicked.connect(lambda: self.on_button('hi'))
def on_button(self, message):
print message # prints "hi"
Is there a nice way to keep both signal arguments so it can be directly received by a function like below?
YES!
Your lambda could take an argument:
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"
Or you could use functools.partial:
# 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"
来源：Pass extra arguments to PyQt slot without losing default signal arguments
示例
def fn_init_event(self):
template_num = len(self.list_comparison_result)
for i in range(template_num):
dict_template = self.list_comparison_result[i]
self.list_button[i].clicked.connect(lambda ignore, dict_template=dict_template: self.fn_get_detail(dict_template, self.test_type, self.product_tag)) # The boolean value gets assigned to ignore (and is ignored) and x (i.e., this) is properly used as the argument of the function
其中 (lambda ignore, dict_template=dict_template: self.fn_get_detail(dict_template, self.test_type, self.product_tag) 中的 dict_template=dict_template 是为了指定当前的 dict_template 为当前传入的值，而非循环中的最后一个 dict_template。这是另外一个很 tricky 的地方了。