NameError name self is not defined

Question

Why such structure  class A      def   init   self  a           self a   a      def p self  b self a           print b   gives an error NameError  name  self  is not defined

User · Answer

If you have arrived here via google  please make sure to check that you have given self as the first parameter to a class function  Especially if you try to reference values for that object instance inside the class function  def foo        print self bar    gt NameError  name  self  is not defined def foo self       print self bar

User · Answer

Default argument values are evaluated at function define-time  but self is an argument only available at function call time  Thus arguments in the argument list cannot refer each other   It s a common pattern to default an argument to None and add a test for that in code   def p self  b None       if b is None          b   self a     print b

User · Answer

For cases where you also wish to have the option of setting  b  to None   def p self    kwargs       b   kwargs get  b   self a      print b

[python] NameError: name 'self' is not defined

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