append new line to file does not work

[wanghaisheng]

i got 1 line dialog as a style template,

from pyonfx import *

io = Ass("1.ass")
meta, styles, lines = io.get_data()

for line in lines:
    
    newline = line.copy()
#     newline.i = lines[0].i+1
    newline.text = 'wo shi ge da sha bi'
    io.write_line(newline)

io.save()

[wanghaisheng]

io = Ass("1.ass")
meta, styles, lines = io.get_data()
lines.insert(1,lines[0].copy())
lines[1].text = "I am a new line!"
io.write_line(lines[1])
print(len(lines))
io.save()```
does not work too

[wanghaisheng]

still no luck

from pyonfx import *

io = Ass("1.ass")
meta, styles, lines = io.get_data()
for line in lines:
    print(line.i)
# lines.insert(1,lines[0].copy())
newline=lines[0].copy()
newline.i=len(lines)+1
lines.insert(newline.i,newline)
newline.text = "I am a new line!"
print(newline.start_time,newline.end_time)
newline.start_time += 2000
newline.end_time += 2000
print(newline.start_time,newline.end_time)
io.write_line(newline)
print(len(lines))
io.save()
# io.open_aegisub()

[CoffeeStraw]

Hi, could you please provide me the subtitle file you used? Thanks!