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  ;; Let's play with a namespace by its name and by its symbol 
  user=> (def for-later-use (create-ns 'my-namespace))
  #'user/for-later-use
  
  user=> (the-ns for-later-use)
  #<Namespace my-namespace>
  
  
  user=> (the-ns 'my-namespace)
  #<Namespace my-namespace>
  
  ;; not going to find anything this way because we just asked the repl
  ;; not to perform an evaluate on it and there is not such 
  ;; namespace with the name "for-later-use"
  user=> (the-ns 'for-later-use)
  java.lang.Exception: No namespace: for-later-use found (NO_SOURCE_FILE:0)
  
  ;; not going to work either because "my-namespace" is the name of a namespace
  ;; and not a symbol that points to something
  user=> (the-ns my-namespace)
  java.lang.Exception: Unable to resolve symbol: my-namespace in this context (NO_SOURCE_FILE:12)
  

  ;; Let's play with a namespace by its name and by its symbol user=> (def for-later-use (create-ns 'my-namespace)) #'user/for-later-use user=> (the-ns for-later-use) #<Namespace my-namespace> user=> (the-ns 'my-namespace) #<Namespace my-namespace> ;; not going to find anything this way because we just asked the repl ;; not to perform an evaluate on it and there is not such ;; namespace with the name "for-later-use" user=> (the-ns 'for-later-use) java.lang.Exception: No namespace: for-later-use found (NO_SOURCE_FILE:0) ;; not going to work either because "my-namespace" is the name of a namespace ;; and not a symbol that points to something user=> (the-ns my-namespace) java.lang.Exception: Unable to resolve symbol: my-namespace in this context (NO_SOURCE_FILE:12)