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    PythonScript early return

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    • Paul Wormer
      Paul Wormer last edited by

      Usually my scripts start with checks on applicability etc. If certain conditions do not hold or errors are detected the script writes an error msg and takes an early return. I searched for a way to return from a PythonScript - other than at the bottom - but couldn’t find it. Is there a way to return from a PythonScript?

      Alan Kilborn 1 Reply Last reply Reply Quote 0
      • Alan Kilborn
        Alan Kilborn @Paul Wormer last edited by

        @paul-wormer

        Perhaps the simplest illustration of how to do it:

        def main():
            # do some stuff
            x = 0
            if x == 0: return  # take an early exit
            # do more stuff
        
        main()
        
        Paul Wormer 1 Reply Last reply Reply Quote 2
        • Alan Kilborn
          Alan Kilborn last edited by PeterJones

          Or you can take the class-based approach to script design, which I prefer. Here’s my template for that:

          # -*- coding: utf-8 -*-
          from __future__ import print_function
          
          from Npp import *
          import inspect
          import os
          
          #-------------------------------------------------------------------------------
          
          class TEST(object):
          
              def __init__(self):
                  self.this_script_name = inspect.getframeinfo(inspect.currentframe()).filename.split(os.sep)[-1].rsplit('.', 1)[0]
          
              def run(self):
                  self.mb('Hello from TEST !')
          
              def mb(self, msg, flags=0, title=''):  # a message-box function
                  return notepad.messageBox(msg, title if title else self.this_script_name, flags)
          
          #-------------------------------------------------------------------------------
          
          if __name__ == '__main__':
              TEST().run()
          

          In this approach you can return early from any function, just like the non-class-based example from the previous post.

          –
          moderator edit: added import os to make it work for default setups (since this script is being referenced by other posts, Alan wanted this to be a “working” script for future user’s copy/paste, and the moderator agreed)

          Paul Wormer 1 Reply Last reply Reply Quote 1
          • Paul Wormer
            Paul Wormer @Alan Kilborn last edited by

            @alan-kilborn
            Yes this solution is very simple, I should have thought of it 😉.

            1 Reply Last reply Reply Quote 1
            • Paul Wormer
              Paul Wormer @Alan Kilborn last edited by

              @alan-kilborn

              inspect.getframeinfo(inspect.currentframe()).filename.split(os.sep)[-1].rsplit('.', 1)[0]
              

              This is abracadabra to me. To begin with, where can I find the attributes of the inspect class?

              Paul Wormer 2 Replies Last reply Reply Quote 0
              • Paul Wormer
                Paul Wormer @Paul Wormer last edited by

                @paul-wormer Stupid question: I see that ‘inspect’ is a Python module.

                Alan Kilborn 1 Reply Last reply Reply Quote 0
                • Alan Kilborn
                  Alan Kilborn @Paul Wormer last edited by Alan Kilborn

                  @paul-wormer

                  I should have added that the “inspect” stuff is there because when I write scripts that use either notepad.messageBox() or notepad.prompt() functions, these bring up a dialog box, and take a parameter to specify the title bar; I like to put the script name there (typically), and rather than hardcode its name, I fetch it at runtime using “inspect”. My mb() function is a little helper function that “wraps” notepad.messageBox() and shows this.

                  Paul Wormer 1 Reply Last reply Reply Quote 1
                  • Paul Wormer
                    Paul Wormer @Alan Kilborn last edited by

                    @alan-kilborn OK thank you, you give me something to try out!

                    Paul Wormer 1 Reply Last reply Reply Quote 1
                    • Paul Wormer
                      Paul Wormer @Paul Wormer last edited by

                      @paul-wormer I see “os.sep”, shouldn’t one “import os”?

                      Alan Kilborn 2 Replies Last reply Reply Quote 2
                      • Alan Kilborn
                        Alan Kilborn @Paul Wormer last edited by Alan Kilborn

                        @paul-wormer said in PythonScript early return:

                        I see “os.sep”, shouldn’t one “import os”?

                        Yes, good catch.

                        So the reason it doesn’t fail without it, for me, is that my startup.py (or something it imports) must import os.

                        I usually test all of my scripts in a “clean” setup before posting; this one seemed so simple, I guess I didn’t bother. :-(

                        PythonScripts are a bit different from the normal use case for Python – here, everything previously done is “remembered”.

                        1 Reply Last reply Reply Quote 2
                        • Paul Wormer
                          Paul Wormer @Paul Wormer last edited by

                          @paul-wormer
                          So,

                          import inspect, os 
                          inspect.getframeinfo(inspect.currentframe()).filename.split(os.sep)[-1].rsplit('.', 1)[0]
                          

                          is wizardry just to get the script name without extension?

                          Alan Kilborn 1 Reply Last reply Reply Quote 0
                          • Alan Kilborn
                            Alan Kilborn @Paul Wormer last edited by

                            @paul-wormer said in PythonScript early return:

                            is wizardry

                            ???

                            No wizardry, just code.

                            Paul Wormer 1 Reply Last reply Reply Quote 0
                            • Paul Wormer
                              Paul Wormer @Alan Kilborn last edited by

                              @alan-kilborn Just kidding. OK you helped me a lot, got wiser by the minute. I know now what to do, thank you again.

                              Paul Wormer 1 Reply Last reply Reply Quote 2
                              • Paul Wormer
                                Paul Wormer @Paul Wormer last edited by

                                @paul-wormer
                                Next question: I have been googling and found an alternative for finding a filename:

                                os.path.basename(os.path.abspath(__file__)).rsplit('.')[0]
                                

                                This does not require importing inspect. I don’t doubt that you are aware of this solution, and since you are not using it, it must have its drawbacks. What are they?

                                Paul Wormer 1 Reply Last reply Reply Quote 1
                                • Paul Wormer
                                  Paul Wormer @Paul Wormer last edited by

                                  @paul-wormer Or even shorter:

                                  os.path.basename(__file__).rsplit('.')[0]
                                  
                                  Alan Kilborn 1 Reply Last reply Reply Quote 0
                                  • Alan Kilborn
                                    Alan Kilborn @Paul Wormer last edited by

                                    @paul-wormer

                                    So, often when I post scripts here, I take something existing that I have (working for a need specific to me), and strip some things out. That’s the case here.

                                    As we’re really trying to focus on Notepad++ and/or PythonScript specific stuff here, diving deeper into the ways of “inspect” or other such things really isn’t appropriate, as it is really not related to either.

                                    In the spirit of fun coding, if you find what you think is a better way of doing something, I say “go for it!”.

                                    1 Reply Last reply Reply Quote 0
                                    • Referenced by  Michael Vincent Michael Vincent 
                                    • Alan Kilborn
                                      Alan Kilborn @Paul Wormer last edited by

                                      @paul-wormer said in PythonScript early return:

                                      I see “os.sep”, shouldn’t one “import os”?

                                      I requested a forum moderator to add the missing import os to the script listing above, and that was done…thanks Mr. Moderator!

                                      1 Reply Last reply Reply Quote 2
                                      • Referenced by  Alan Kilborn Alan Kilborn 
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