def __str__(self): ^ IndentationError: unindent does not match any outer indentation level code example

Example: unindent does not match any outer indentation level (, line 26)pylint(syntax-error)

"""You have to check the space before each instruction after a condition
The space shall not be composed of little spaces (---) but with long identation
Ex:
"""
#Good position
if x==1:
  print("Ok")

#Wrong position
if X==2:
 print("Erreur")