@lucas2301 from the Files app, you can
select any type of file,
share it,
run Pythonista script,
select standard "import file"

and the file arrives in the Pythonista root...

With

    h = font_size + 4
    if pos == 'top':
        tv.setFrame_(CGRect(CGPoint(x,0), CGSize(tv.frame().size.width, tv.frame().size.height)))
        h = tv.frame().size.height

you could even have a ruler for the entire height

Sorry, little bug, when you change mode top/keyboard for testing, use this
and change kbd or top in pos = ...

#coding: utf-8
import editor
from   objc_util import *
import ui

NSUserDefaults = ObjCClass('NSUserDefaults')

@on_main_thread 
def main():     
    pos = 'kbd' # or 'top'
    ev = editor._get_editor_tab().editorView()
    tv = ev.textView()
    #print(dir(tv))

    # get x-position and line height of Editor line 
    p = tv.positionFromPosition_offset_(tv.beginningOfDocument(), 0)
    rge = tv.textRangeFromPosition_toPosition_(p,p)
    rect = tv.firstRectForRange_(rge)   # CGRect
    x = rect.origin.x
    y = rect.origin.y
    h = rect.size.height
    if pos == 'top':
        tv.setFrame_(CGRect(CGPoint(x,y), CGSize(tv.frame().size.width, tv.frame().size.height)))
    

    # get font of Editor
    defaults = NSUserDefaults.standardUserDefaults()
    font_name = str(defaults.valueForKey_('EditorFontName'))
    font_size = int(str(defaults.valueForKey_('EditorFontSize')))
    
    # create ui.View for InputAccessoryView above keyboard
    v = ui.ImageView()
    w = ui.get_screen_size()[0]         # width of keyboard = screen
    h = font_size + 4
    v.frame = (0,0,w,h)
    v.border_width = 1
    v.border_color = 'lightgray'
    d = ui.measure_string('A',font=(font_name,font_size))[0]
    with ui.ImageContext(w,h) as ctx:
        n = 0
        while x < w:
            color = 'black' if n%10 == 0 else 'lightgray'
            ui.set_color(color)
            path = ui.Path()
            path.move_to(x,0)
            path.line_to(x,h)
            path.stroke()
            x = x + d
            n += 1
        ui_image = ctx.get_image()
    v.image = ui_image
    v.background_color = (1,1,1,0.2)
    #v.background_color = (0,1,0,0.2)
    v.touch_enabled = False
    vo = ObjCInstance(v)                                    # get ObjectiveC object of v
    retain_global(v) # see https://forum.omz-software.com/topic/4653/button-action-not-called-when-view-is-added-to-native-view
    if pos == 'top':
        tv.superview().addSubview_(vo)
    else:
        tv.setInputAccessoryView_(vo)   # attach accessory to textview
#AAAAAAAAAAAAAAAAAAA
#23456789012345678901234567890123456789012345678901234567891#23456789012345678

if __name__ == '__main__':  
    main()

@da44id This little (quick and dirty as usual for me 😀) creates a transparent
view at the top of the editor window.

If you prefer, you could put the ruler, as InputAccessoryView above the
standard keyboard, so you can scroll your script and see any line under
the ruler.

Comment the line
tv.superview().addSubview_(vo)
and uncomment the line
#tv.setInputAccessoryView_(vo) # attach accessory to textview

Editor font from Pythonista setting is extracted to know the width of a cell of the ruler.
You have to configure this script as a tool and run it in the editor tab.

Or

#coding: utf-8
import editor
from   objc_util import *
import ui

NSUserDefaults = ObjCClass('NSUserDefaults')

@on_main_thread 
def main():     
    ev = editor._get_editor_tab().editorView()
    tv = ev.textView()
    #print(dir(tv))

    # get x-position and line height of Editor line 
    p = tv.positionFromPosition_offset_(tv.beginningOfDocument(), 0)
    rge = tv.textRangeFromPosition_toPosition_(p,p)
    rect = tv.firstRectForRange_(rge)   # CGRect
    x = rect.origin.x
    y = rect.origin.y
    h = rect.size.height
    tv.setFrame_(CGRect(CGPoint(x,y), CGSize(tv.frame().size.width, tv.frame().size.height)))
    

    # get font of Editor
    defaults = NSUserDefaults.standardUserDefaults()
    font_name = str(defaults.valueForKey_('EditorFontName'))
    font_size = int(str(defaults.valueForKey_('EditorFontSize')))
    
    # create ui.View for InputAccessoryView above keyboard
    v = ui.ImageView()
    w = ui.get_screen_size()[0]         # width of keyboard = screen
    h = font_size + 4
    v.frame = (0,0,w,h)
    v.border_width = 1
    v.border_color = 'lightgray'
    d = ui.measure_string('A',font=(font_name,font_size))[0]
    with ui.ImageContext(w,h) as ctx:
        n = 0
        while x < w:
            color = 'black' if n%10 == 0 else 'lightgray'
            ui.set_color(color)
            path = ui.Path()
            path.move_to(x,0)
            path.line_to(x,h)
            path.stroke()
            x = x + d
            n += 1
        ui_image = ctx.get_image()
    v.image = ui_image
    v.background_color = (1,1,1,0.2)
    #v.background_color = (0,1,0,0.2)
    v.touch_enabled = False
    vo = ObjCInstance(v)                                    # get ObjectiveC object of v
    retain_global(v) # see https://forum.omz-software.com/topic/4653/button-action-not-called-when-view-is-added-to-native-view
    #tv.superview().addSubview_(vo)
    tv.setInputAccessoryView_(vo)   # attach accessory to textview
#AAAAAAAAAAAAAAAAAAA
#23456789012345678901234567890123456789012345678901234567891#23456789012345678

if __name__ == '__main__':  
    main() 

@resserone13 Oups 😬 no idea

@Alkaar the beta version solves that, I think

Fixed an issue with the extra key row hiding console input on 2018 iPad Pros. 

@Alkaar see here

@JorkGomes Please read this topic (from its begin to its end) and you would be able to launch any app from Pythonista, even without url scheme

@ccc As usual, you're right and as usual, I forgot that... Thanks for @resserone13 and for me

You can also put a line with 3 quotes above and under these lines

'''
these 
lines 
are 
commented
'''