What is the python equivalent of the Perl pattern to track if something has already been seen? -


In Perl, anyone can do the following 

 for  (@foo) {# If If $ $ {$ _} ++; }

I want to be able to be equivalent to Python, which is to leave a block if it has been executed once. 

  seen = set () in foo for x: if seen in x: continue to view Keep it. See the documentation for more information.  
 In addition, in the examples given below in the module document, there is a  unique_everseen  generator that you can use in this way: 
 
  unique_ everseen ( Foo): # something

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