如何在字典中使用字典调用函数

Question

In order to call a function using dictionary we use the following code:

def f1():
    print ("One")

def f2():
    print ("Two")

def f3():
    print ("Three")

dict = {1: f1, 2: f2, 3: f3}

dict[1]()

How does the last line dict[1]() actually works?

Answer 1

Functions in Python are first class objects. This means that functions are objects that can be sent as parameters, they can be stored in data structures and you can do with them same as simple objects. You can read about them here .