Check if string is a single emoji

emoji_check.py

"""Check if a string is a single emoji.

Surely there must be a library that does this already, but I couldn't find one.
If you know one, let me know so I can delete this and never speak of it again.
"""

import emoji

# Some of the more complicated emoji are stored with spaces in the emoji library
FIXED_UNICODE_EMOJI = {
    key.replace(' ', ''): value for key, value in emoji.UNICODE_EMOJI.items()
}

def is_single_emoji(s):
    if s in FIXED_UNICODE_EMOJI:
        return True
      
    was_emoji_char = False
    was_zero_width_joiner = False
    was_variation = False
    for index, char in enumerate(s):            
        is_emoji_char = char in FIXED_UNICODE_EMOJI
        is_zero_width_joiner = char == '\u200D'
        is_variation = 0xFe00 <= ord(char) <= 0xFE0F or 0x1f3fb <= ord(char) <= 0x1f3ff
    
        if not any([is_emoji_char, is_zero_width_joiner, is_variation]):
            # Only emoji characters, join characters and variations can occur in an emoji
            return False
        
        if (is_zero_width_joiner or is_variation) and index == 0:
            # First character has to be an emoji
            return False
            
        if (
            (is_zero_width_joiner or is_variation) and 
            index > 0 and 
            not (was_emoji_char or was_variation)
        ):
            # If the current character is a separator/variation, the previous needs to be an emoji
            return False
            
        if (is_emoji_char and not is_variation) and index > 0 and not was_zero_width_joiner:
            # If the current character is an emoji, the previous one can't be an emoji  
            return False
        
        was_emoji_char = is_emoji_char
        was_zero_width_joiner = is_zero_width_joiner
        was_variation = is_variation
        
    return True