python - Why it's not possible to create object attribute outside object methods? -

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When researching about Python class attributes and example attributes, I found out that it is not possible to exclude object attributes from objects. (

or class method can be). Like the code below, "NameError" will be generated in Python. 

  class test (object): def __init __ (self): self.lst = [] self.str = 'xyz'   
 Why the Python Do not allow? I am not questioning the language maker's decision but there is a reason behind this. As such, it is technically incorrect or any other disadvantage of this behavior.   
 
 
 You are defining a class, so there is no instance of pointing out external methods. Self:  
  Drop square exam (object): def __init __ (self): self.lst = [] str = 'xyz'   
 < Indicates code> self  to  example , not class. You need to either make an example and assign  or  directly to the attributes ( test (. Str = 'xyz' ), you will get a method (when  Actually  can actually refer to an example).

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