jgart <jg...@dismail.de> writes:

> Why do we check if python is a promise and then "force" it?

See the comment in this definition:

(define package-with-python2
  ;; Note: delay call to 'default-python2' until after the 'arguments' field
  ;; of packages is accessed to avoid a circular dependency when evaluating
  ;; the top-level of (gnu packages python).
  (package-with-explicit-python (delay (default-python2))
                                "python-" "python2-"
                                #:variant-property 'python2-variant))

-- 
Ricardo

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