Try this approach: __repr__() should return valid Python code. That would allow you to
second = eval(repr(first))In your example you probably need something like this:
def __repr__(self):
return "OrderedSet(%r)" % self.listas well as a corresponding constructor:
def __init__(self, elements): self.list = elements
The __repr__ dunder method defines behavior when you pass an instance of a class to the repr().,The __repr__ method returns the string representation of an object. Typically, the __repr__() returns a string that can be executed and yield the same value as the object.,When a class doesn’t implement the __str__ method and you pass an instance of that class to the str(), Python returns the result of the __repr__ method because internally the __str__ method calls the __repr__ method:,The __str__ method returns a string representation of an object that is human-readable while the __repr__ method returns a string representation of an object that is machine-readable.
First, define the Person class with three instance attributes first_name, last_name, and age:
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class Person:
def __init__(self, first_name, last_name, age):
self.first_name = first_name
self.last_name = last_name
self.age = ageCode language: Python(python)Second, create a new instance of the Person class and display its string representation:
person = Person('John', 'Doe', 25)
print(repr(person)) Code language: Python(python)Output:
< __main__.Person object at 0x000001F51B3313A0 > Code language: HTML, XML(xml)When you pass an instance of the Person class to the repr(), Python will call the __repr__ method automatically. For example:
person = Person("John", "Doe", 25)
print(repr(person)) Code language: Python(python)For example:
person = Person('John', 'Doe', 25)
print(person) Code language: Python(python)In Python, __repr__ is a special method used to represent a class’s objects as a string. __repr__ is called by the repr() built-in function. You can define your own string representation of your class objects using the __repr__ method.,Let’s make a class, Person, and define the __repr__ method. We can then call this method using the built-in Python function repr().,According to the official documentation, __repr__ is used to compute the “official” string representation of an object and is typically used for debugging.,Special methods are a set of predefined methods used to enrich your classes. They start and end with double underscores.
# A simple Person class
class Person:
def __init__(self, name, age):
self.name = name
self.age = age
def __repr__(self):
rep = 'Person(' + self.name + ',' + str(self.age) + ')'
return rep
# Let 's make a Person object and print the results of repr()
person = Person("John", 20)
print(repr(person))In Python, you can specify a textual representation of an object by implementing the __repr__() method into the class.,When you print a Fruit object, the __repr__() method gets called automatically and the textual representation is displayed in the console:,In Python, it is possible to override the default description of a custom object by specifying the __repr__() method into the class.,Next, let’s take a look at how you can solve this problem by implementing a user-friendly __str__() method into the class.
For example:
class Fruit:
def __init__(self, name):
self.name = name
def __repr__(self):
return f 'Fruit("{self.name}")'When you print a Fruit object, the __repr__() method gets called automatically and the textual representation is displayed in the console:
banana = Fruit("Banana")
print(banana)Output:
Fruit("Banana")Let’s create a couple of Fruit objects with this class:
banana = Fruit("Banana")
apple = Fruit("Apple")Now, let’s print these objects into the console:
print(banana) print(apple)
The repr() method returns a string containing a printable representation of an object. The repr() function calls the underlying __repr__() function of the object.,The repr() function returns the string representation of the value passed to eval function by default. For the custom class object, it returns a string enclosed in angle brackets that contains the name and address of the object by default.,obj: Required. The object whose printable representation is to be returned.,The following example demonstrates the repr() method.
Syntax:
repr(obj)
print(repr(10)) print(repr(10.5)) print(repr(True)) print(repr(4 + 2))
'10'
'10.5'
'True'
'6''<main.student object at 0x0000000003B1FF98>'class student:
name = ''
def __repr__(self):
return 'student class'
std = student()
repr(std)print(repr(10)) print(repr(10.5)) print(repr(True)) print(repr(4 + 2))
'10'
'10.5'
'True'
'6'class student:
name = ''
std = student()
repr(std)'<main.student object at 0x0000000003B1FF98>'class student:
name = ''
def __repr__(self):
return 'student class'
std = student()
repr(std)