Object-oriented object visualization of Python

Continue with the previous example: http://blog.51cto.com/lavenliu/2126344

Look at the example of the plural in the front, add the __str__ attribute here,

class Complex:    def __init__(self, real, imag):        self.real = read        self.imag = imag    def __add__(self, other):        return Complex(self.real + other.real, self.imag + other.imag)    def __sub__(self, other):        return Complex(self.real - other.read, self.imag - other.imag)    def __str__(self):        if self.imag >= 0:            return ‘{} + {}i‘.format(self.real, self.imag)        return ‘{} - {}i‘.format(self.real, self.imag * -1)    def __repr__(self):        return ‘<{}.{}({}, {}) at {}>‘.format(self.__module__, self.__class__.__name__, self.real, self.imag, hex(id(self)))c1 = Complex(1, 2)c1.realc1.imagc1 # 这里的输出也可以定制，增加__repr__方法‘{}‘.format(c1)str(c) # str调用对象的__str__方法。__str__要返回一个字符串。

Two visualization methods, __str__ and __repr__ methods. Their differences and connections are:

1. Same point
   • Both require a string to be returned
2. Different points
   • __str__The returned string is closer to the natural language;
   • __repr__The returned string is more reflective of the interpreter-related;
   • The above is just an agreement;

Object-oriented object visualization of Python