repr method in python

Question

Can anyone explain what is __repr__ and when and how to use it? I can't understand nothing about it.

Answer 1

class a:
def __str__(self):
return 'a'
def __repr__(self):
return 'A'

print(a()) #a
print(repr(a())) #A
print(str(a())) #a

>>> class a:
... def __repr__(self): return 'A'
...
>>> a()
A

Answer 2

__str__ is called when you print a variable
__repr__ is called in interactive mode