Read .txt with emoji characters in python

I try to read a chat history with smilies in it, but I get the following error:

UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in position 38: character maps to

My code looks like this:

file_name = "chat_file.txt"
chat = open(chat_file)
chatText = chat.read() # read data
chat.close()
print(chatText)

I am pretty certain that it's because of elements like: ❤

How can I implement the correct Transformation Format // what is the correct file encoding so python can read these elements?

Never open text files without specifying their encoding.

Also, use with blocks, these automatically call .close() so you don't have to.

file_name = "chat_file.txt"

with open(chat_file, encoding="utf8") as chat:
    chat_text = chat.read()

print(chat_text)

iso-8859-1 is a legacy encoding, that means it cannot contain emoji. For emoji the text file has to be Unicode. And the most common encoding for Unicode is UTF-8.