第一种方法:初始化字典时添加(注意添加逗号)
switch = {
"A": lambda x: self.send_to_A(x),
"B": lambda x: self.send_to_B(x),
"C": lambda x: self.send_to_C(x)
}
第二种方法:初始化字典后添加(不用添加逗号)
switch = {}
switch["A"] = lambda x: self.send_to_A(x)
switch["B"] = lambda x: self.send_to_B(x)
switch["C"] = lambda x: self.send_to_C(x)