为何实例化Robot类时出现Type Error: Robot() takes no argument错误？

Hey there, let's get this error sorted out right away— I can spot the exact problem here.

The Root Cause #

Your Robot class's constructor method has a tiny but critical typo: you wrote __init(self, name, color, weight) instead of the required __init__(self, name, color, weight).

In Python, the class constructor must be named __init__ (with two underscores at both the start and end). When you use only one trailing underscore (__init), Python doesn't recognize this as the class's proper constructor. Instead, it uses the default no-argument constructor that comes with all classes. That's why passing arguments like "johh","Red", 40 to Robot() throws the "takes no arguments" error.

Corrected Code #

Here's the fixed version of your code, with the proper constructor name and a small readability tweak for the output:

class Robot: 
    def __init__(self,name, color, weight):  # Fixed: added the second trailing underscore
        self.name = name 
        self.color = color 
        self.weight = weight 
    def self_introduce(self): 
        print(f"hello my name is {self.name}, my eye colour is {self.color} and my weight is {self.weight} ") 
r1 = Robot("johh","Red", 40) 
r2 = Robot("murry","Blue", 45) 
r1.self_introduce() 
r2.self_introduce()

内容的提问来源于stack exchange，提问作者Shishir Acharya