Scuffed script to convert novel style roleplay text into markdown format

jank_convert_novel_to_markdown.py

import sys

read_file = open(sys.argv[1],"r")
roleplay_text = read_file.read()
read_file.close()

def convert_novel_to_md(text):
	md = ""
	if '"' in text:
                parts = text.split('"')
                for part in parts:
                        if (parts.index(part) % 2) == 0 and part.strip() is not "":
                                part = part.strip()
                                if part.startswith('*') and part.endswith('*'):
                                        md = md + part + ' '
                                else:
                                        part = '*' + part + '*'
                                        md = md + part + ' '
                        elif (parts.index(part) % 2) != 0 and part.strip() is not "":
                                md = md + part.strip() + ' '
	else:
		md = '*' + text.strip() + '*'
	return md.strip()

write_file = open("output.txt","w")
final_text = ""
exclude = r"<>[]()"
lines = roleplay_text.strip().split("\n")

for line in lines:
        line = line.strip()
        if line is "":
                final_text = final_text + "\n"
        elif any(elem in line for elem in exclude):
                final_text = final_text + line + "\n"
        elif line.startswith("{{user}}:"):
                line = line.replace("{{user}}:","",1)
                final_text = final_text + "{{user}}: " + convert_novel_to_md(line) + "\n"
        elif line.startswith("{{char}}:"):
                line = line.replace("{{char}}:","",1)
                final_text = final_text + "{{char}}: " + convert_novel_to_md(line) + "\n"
        else:
                final_text = final_text + convert_novel_to_md(line) + "\n"
        
write_file.write(final_text.strip())
write_file.close()