class Item():

    def __init__(self,name):

        self._name=name

　　def __str__(self):

   　　return "Item's name is :"+self._name

print((Item("Car"),))

C:\Python35\python.exe C:/fitme/work/nltk/1.py

(<__main__.Item object at 0x000001DC3F9BB390>,)

Process finished with exit code 0

class Item():

    def __init__(self,name):

        self._name=name

    # def __str__(self):

    #     return "Item's name is :"+self._name

    def __repr__(self):

        return "Item's name is :" + self._name

print((Item("Car"),))

C:\Python35\python.exe C:/fitme/work/nltk/1.py

(Item's name is :Car,)

Process finished with exit code 0

Some data types, like file objects, can't be converted to strings this way. The __repr__ methods of such objects usually return a string in angle brackets that includes the object's data type and memory address. User-defined classes also do this if you don't specifically define the __repr__ method.

When you compute a value in the REPL, Python calls __repr__ to convert it into a string. When you use print, however, Python calls __str__.

When you call print((Item("Car"),)), you're calling the __str__ method of the tuple class, which is the same as its __repr__ method. That method works by calling the __repr__ method of each item in the tuple, joining them together with commas (plus a trailing one for a one-item tuple), and surrounding the whole thing with parentheses. I'm not sure why the __str__ method of tuple doesn't call __str__ on its contents, but it doesn't.

print(('hello').__str__())

print(('hello').__repr__())

from datetime import datetime as dt

print(dt.today().__str__())

print(dt.today().__repr__())