Function into Class

Convert 3 functions into a class with 3 methods.

Before

def calculate_area(length, width):
    result = length * width
    return result

def calculate_perimiter(length, width):
    result = 2 * (length + width)
    return result

def calculate_volume(length, width, height):
    result = length * width * height
    return result

After

class Calculator:
    @staticmethod
    def get_area(len, wid):
        return len * wid

    @staticmethod
    def get_perimiter(len, wid):
        return 2 * (len + wid)

    @staticmethod
    def get_volume(len, wid, hei):
        return len * wid * hei

Preview

Command

%scalculate<enter>cget<esc>

O@staticmethod

<esc>jxxs\w+<enter>s

length|width|height<enter>

bllled%sresult =<enter>C

<alt-(>;ddss<enter>

xd%>O<backspace>

class Calculator:

1. % selects the entire file

2. s searches inside the current selection and creates sub-selections based on a pattern. Input calculate then hit <enter> to make a selection on all instances of the word

3. c then type get to change each "calculate" word into a "get"

4. <esc> to go back to normal mode

5. Use O to create an empty line above each cursor, write:

   @staticmethod
   

6. Hit <esc> to go into normal mode.

7. We need to select 2 lines below the current line, first go down with j and then press xx which will select the current line, and then select the next line In total we now have 3 cursors each with 2 lines selected, which includes the first line of the bodies of each function and the function definition themselves

8. s brings up a prompt to select sub-selections by a given regex. The \w+ regex selects each word, type it and then <enter>

9. s again then type length|width|height followed by <enter>. This will look at the contents of the current selections, and create sub-selections where it finds the regex which means "length or width or height". So we select each instance of those 3 words

10. Our cursor is currently at the end of each word. Let's go to the beginning with b

11. We want to keep the first 3 characters and discard the rest from each of the parameters. To do this, move to the 4th character with lll

12. Use e to select until the end of each word and then d to delete it

13. Select the entire file again with % followed by s to bring up selection prompt again

14. Write result = followed by <enter> to select all instances of that string

15. C creates a new selection on the line directly below, for each cursor

16. Use <alt-(> to rotate the contents of the selection backward

17. ; collapses each cursor into a single selection

18. dd deletes two characters on each of the 6 lines

19. s to bring up the prompt, then input s followed by <enter> to select all "s" characters

20. Select each of the lines with x followed by d to delete

21. Select whole file with % and indent with >

22. O creates a newline above and enters Insert mode, then <backspace> to delete an extra tab

23. Write this:

    class Calculator: