What s the common practice for enums in Python

Question

Possible Duplicate    How can I represent an  enum  in Python        What s the common practice for enums in Python  I e  how are they replicated in Python   public enum Materials       Shaded      Shiny      Transparent      Matte

User · Answer

You could probably use an inheritance structure although the more I played with this the dirtier I felt   class AnimalEnum     classmethod   def verify cls  other       return issubclass other   class    cls    class Dog AnimalEnum     pass  def do something thing that should be an enum     if not AnimalEnum verify thing that should be an enum       raise OhGodWhy

User · Answer

I have no idea why Enums are not support natively by Python  The best way I ve found to emulate them is by overridding   str   and   eq   so you can compare them and when you use print   you get the string instead of the numerical value   class enumSeason        Spring   0     Summer   1     Fall   2     Winter   3     def   init   self  Type           self value   Type     def   str   self           if self value    enumSeason Spring              return  Spring          if self value    enumSeason Summer              return  Summer          if self value    enumSeason Fall              return  Fall          if self value    enumSeason Winter              return  Winter      def   eq   self y          return self value  y value   Usage    gt  gt  gt  s   enumSeason enumSeason Spring    gt  gt  gt  print s   Spring

User · Answer

I ve seen this pattern several times    gt  gt  gt  class Enumeration object           def   init   self  names      or  names  with no  split               for number  name in enumerate names split                     setattr self  name  number    gt  gt  gt  foo   Enumeration  bar baz quux    gt  gt  gt  foo quux 2   You can also just use class members  though you ll have to supply your own numbering    gt  gt  gt  class Foo object           bar    0         baz    1         quux   2   gt  gt  gt  Foo quux 2   If you re looking for something more robust  sparse values  enum-specific exception  etc    try this recipe

User · Answer

class Materials      Shaded  Shiny  Transparent  Matte   range 4    gt  gt  gt  print Materials Matte 3

[python] What's the common practice for enums in Python?

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