What is the difference of using `au BufNewFile,BufRead *.py` and `au Filetype python` in .vimrc?











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1
down vote

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As I am setting .vimrc, I found these two code blocks have the same functionality.



au Filetype python set
tabstop=4
softtabstop=4
shiftwidth=4
textwidth=79


and



au BufNewFile,BufRead *.py
set tabstop=4
set softtabstop=4
set shiftwidth=4
set textwidth=79


I reckon that there is a very subtle difference between them, but cannot figure it out. Like, vim interpret Filetype when open the file etc.



Can any one explain it to me with mercy?



Thank you very much!










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    up vote
    1
    down vote

    favorite












    As I am setting .vimrc, I found these two code blocks have the same functionality.



    au Filetype python set
    tabstop=4
    softtabstop=4
    shiftwidth=4
    textwidth=79


    and



    au BufNewFile,BufRead *.py
    set tabstop=4
    set softtabstop=4
    set shiftwidth=4
    set textwidth=79


    I reckon that there is a very subtle difference between them, but cannot figure it out. Like, vim interpret Filetype when open the file etc.



    Can any one explain it to me with mercy?



    Thank you very much!










    share|improve this question







    New contributor




    Songcheng Li is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.






















      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      As I am setting .vimrc, I found these two code blocks have the same functionality.



      au Filetype python set
      tabstop=4
      softtabstop=4
      shiftwidth=4
      textwidth=79


      and



      au BufNewFile,BufRead *.py
      set tabstop=4
      set softtabstop=4
      set shiftwidth=4
      set textwidth=79


      I reckon that there is a very subtle difference between them, but cannot figure it out. Like, vim interpret Filetype when open the file etc.



      Can any one explain it to me with mercy?



      Thank you very much!










      share|improve this question







      New contributor




      Songcheng Li is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      As I am setting .vimrc, I found these two code blocks have the same functionality.



      au Filetype python set
      tabstop=4
      softtabstop=4
      shiftwidth=4
      textwidth=79


      and



      au BufNewFile,BufRead *.py
      set tabstop=4
      set softtabstop=4
      set shiftwidth=4
      set textwidth=79


      I reckon that there is a very subtle difference between them, but cannot figure it out. Like, vim interpret Filetype when open the file etc.



      Can any one explain it to me with mercy?



      Thank you very much!







      vimrc vimscript






      share|improve this question







      New contributor




      Songcheng Li is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question







      New contributor




      Songcheng Li is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question






      New contributor




      Songcheng Li is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      asked Dec 10 at 22:00









      Songcheng Li

      63




      63




      New contributor




      Songcheng Li is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.





      New contributor





      Songcheng Li is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






      Songcheng Li is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






















          1 Answer
          1






          active

          oldest

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          up vote
          3
          down vote













          Your intuition is correct: the two autocommands are very similar.



          The second autocommand runs when you read or start editing a new file with a name that ends in the .py extension. The first runs when the file type is set to Python, which Vim will generally do automatically for .py files.



          However, try running the following commands with each of the two autocommands in place:



          :new
          :w new.py


          You will find that the Filetype autocommand runs, but the other does not. For this reason, you should probably use the first version if you want to use an autocommand for this.



          However, in my opinion, there is an even better solution. Create a file in the location:



          ~/.vim/after/ftplugin/python.vim


          And enter the contents:



          set tabstop=4
          set softtabstop=4
          set shiftwidth=4
          set textwidth=79


          This will have the same effect, no autocommands required!






          share|improve this answer























          • Thank you so much!
            – Songcheng Li
            Dec 10 at 23:26






          • 2




            @SongchengLi I think Vim's Python ftplugin also reads shebangs (so a file with no extension but #! /usr/bin/python as the shebang gets detected as a Python file).
            – muru
            Dec 11 at 2:01













          Your Answer








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          1 Answer
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          active

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          1 Answer
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          up vote
          3
          down vote













          Your intuition is correct: the two autocommands are very similar.



          The second autocommand runs when you read or start editing a new file with a name that ends in the .py extension. The first runs when the file type is set to Python, which Vim will generally do automatically for .py files.



          However, try running the following commands with each of the two autocommands in place:



          :new
          :w new.py


          You will find that the Filetype autocommand runs, but the other does not. For this reason, you should probably use the first version if you want to use an autocommand for this.



          However, in my opinion, there is an even better solution. Create a file in the location:



          ~/.vim/after/ftplugin/python.vim


          And enter the contents:



          set tabstop=4
          set softtabstop=4
          set shiftwidth=4
          set textwidth=79


          This will have the same effect, no autocommands required!






          share|improve this answer























          • Thank you so much!
            – Songcheng Li
            Dec 10 at 23:26






          • 2




            @SongchengLi I think Vim's Python ftplugin also reads shebangs (so a file with no extension but #! /usr/bin/python as the shebang gets detected as a Python file).
            – muru
            Dec 11 at 2:01

















          up vote
          3
          down vote













          Your intuition is correct: the two autocommands are very similar.



          The second autocommand runs when you read or start editing a new file with a name that ends in the .py extension. The first runs when the file type is set to Python, which Vim will generally do automatically for .py files.



          However, try running the following commands with each of the two autocommands in place:



          :new
          :w new.py


          You will find that the Filetype autocommand runs, but the other does not. For this reason, you should probably use the first version if you want to use an autocommand for this.



          However, in my opinion, there is an even better solution. Create a file in the location:



          ~/.vim/after/ftplugin/python.vim


          And enter the contents:



          set tabstop=4
          set softtabstop=4
          set shiftwidth=4
          set textwidth=79


          This will have the same effect, no autocommands required!






          share|improve this answer























          • Thank you so much!
            – Songcheng Li
            Dec 10 at 23:26






          • 2




            @SongchengLi I think Vim's Python ftplugin also reads shebangs (so a file with no extension but #! /usr/bin/python as the shebang gets detected as a Python file).
            – muru
            Dec 11 at 2:01















          up vote
          3
          down vote










          up vote
          3
          down vote









          Your intuition is correct: the two autocommands are very similar.



          The second autocommand runs when you read or start editing a new file with a name that ends in the .py extension. The first runs when the file type is set to Python, which Vim will generally do automatically for .py files.



          However, try running the following commands with each of the two autocommands in place:



          :new
          :w new.py


          You will find that the Filetype autocommand runs, but the other does not. For this reason, you should probably use the first version if you want to use an autocommand for this.



          However, in my opinion, there is an even better solution. Create a file in the location:



          ~/.vim/after/ftplugin/python.vim


          And enter the contents:



          set tabstop=4
          set softtabstop=4
          set shiftwidth=4
          set textwidth=79


          This will have the same effect, no autocommands required!






          share|improve this answer














          Your intuition is correct: the two autocommands are very similar.



          The second autocommand runs when you read or start editing a new file with a name that ends in the .py extension. The first runs when the file type is set to Python, which Vim will generally do automatically for .py files.



          However, try running the following commands with each of the two autocommands in place:



          :new
          :w new.py


          You will find that the Filetype autocommand runs, but the other does not. For this reason, you should probably use the first version if you want to use an autocommand for this.



          However, in my opinion, there is an even better solution. Create a file in the location:



          ~/.vim/after/ftplugin/python.vim


          And enter the contents:



          set tabstop=4
          set softtabstop=4
          set shiftwidth=4
          set textwidth=79


          This will have the same effect, no autocommands required!







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Dec 10 at 23:29

























          answered Dec 10 at 23:25









          Rich

          14.4k11764




          14.4k11764












          • Thank you so much!
            – Songcheng Li
            Dec 10 at 23:26






          • 2




            @SongchengLi I think Vim's Python ftplugin also reads shebangs (so a file with no extension but #! /usr/bin/python as the shebang gets detected as a Python file).
            – muru
            Dec 11 at 2:01




















          • Thank you so much!
            – Songcheng Li
            Dec 10 at 23:26






          • 2




            @SongchengLi I think Vim's Python ftplugin also reads shebangs (so a file with no extension but #! /usr/bin/python as the shebang gets detected as a Python file).
            – muru
            Dec 11 at 2:01


















          Thank you so much!
          – Songcheng Li
          Dec 10 at 23:26




          Thank you so much!
          – Songcheng Li
          Dec 10 at 23:26




          2




          2




          @SongchengLi I think Vim's Python ftplugin also reads shebangs (so a file with no extension but #! /usr/bin/python as the shebang gets detected as a Python file).
          – muru
          Dec 11 at 2:01






          @SongchengLi I think Vim's Python ftplugin also reads shebangs (so a file with no extension but #! /usr/bin/python as the shebang gets detected as a Python file).
          – muru
          Dec 11 at 2:01












          Songcheng Li is a new contributor. Be nice, and check out our Code of Conduct.










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