Python Merge two subtitles

merge-subtitles.py

#!/usr/bin/python3
# -*- coding: utf8 -*-

# ----------------------------------------------------------------------------
#      Name: merge-subtitles
#      Desc: Merge two subtitles
#     Usage: merge-subtitles sub1_file sub2_file out.ass
#   Example: merge_subtitles friends_s01e01_720p_bluray_x264-sujaidr.mp4en.srt friends_s01e01_720p_bluray_x264-sujaidr.mp4vi.srt friends_s01e01_720p_bluray_x264-sujaidr.mp4.ass
# Copy From: https://github.com/duyamin/standalone-scripts/blob/master/python/merge-subtitles.py
# ----------------------------------------------------------------------------

import sys
import aeidon

header = """[Script Info]
ScriptType: v4.00+
Collisions: Normal
[V4+ Styles]
Name,Fontname,Fontsize,PrimaryColour,SecondaryColour,OutlineColour,BackColour,Bold,Italic,Underline,StrikeOut,ScaleX,ScaleY,Spacing,Angle,BorderStyle,Outline,Shadow,Alignment,MarginL,MarginR,MarginV,Encoding
Style: Default,WenQuanYi Micro Hei,16,&H00ffffff,&H00000000,&H00000000,0,0,2,1,1,0,20,20,20
Style: Alternate,WenQuanYi Micro Hei,9,&H00ffffff,&H00000000,&H00000000,0,0,2,1,1,0,20,20,20
Style: Top,Arial,16,&H00F9FFFF,&H00FFFFFF,&H80000000,&H80000000,-1,0,0,0,100,100,0,0,1,3,0,8,10,10,10,0
Style: Mid,Arial,16,&H0000FFFF,&H00FFFFFF,&H80000000,&H80000000,-1,0,0,0,100,100,0,0,1,3,0,5,10,10,10,0
Style: Bot,Arial,16,&H00F9FFF9,&H00FFFFFF,&H80000000,&H80000000,-1,0,0,0,100,100,0,0,1,3,0,2,10,10,10,0
"""

def merge_subtitles(in_filename1, in_filename2, out_filename):
    encoding1 = encoding2 = 'utf-8'

    # create aeidon project
    project1 = aeidon.Project()
    project2 = aeidon.Project()
    project1.open_main(in_filename1, encoding1)
    project2.open_main(in_filename2, encoding2)

    # setup output format
    out_format = aeidon.files.new(aeidon.formats.ASS, out_filename, "utf_8")
    out_format.header = header

    # motify event entries
    for subtitle in project1.subtitles:
        subtitle.main_text = subtitle.main_text.replace('\n', ' ')
        subtitle.ssa.style = 'Top'
    for subtitle in project2.subtitles:
        subtitle.main_text = subtitle.main_text.replace('\n', ' ')
        subtitle.ssa.style = 'Bot'

    project1.subtitles.extend(project2.subtitles)
    project1.save_main(out_format)

def usage():
    print('./merge-subtitles sub1_file sub2_file out.ass')

def main():
    if len(sys.argv) != 4:
        usage()
    else:
        merge_subtitles(*sys.argv[1:])

if __name__ == '__main__':
    main()

Where did you learn to use aiedon?
I can't find access to styles list.