Another solution is to use the name aliases and print them using the string literal \N

print('\N{grinning face with smiling eyes}')

Current list of name aliases can be found at: https://unicode.org/Public/15.0.0/ucd/UnicodeData-15.0.0d6.txt

Or the Folder for everything here: https://unicode.org/Public/

'😀' is already a Unicode object. UTF-8 is not Unicode, it's a byte encoding for Unicode. To get the codepoint number of a Unicode character, you can use the ord function. And to print it in the form you want you can format it as hex. Like this:

s = '😀'
print('U+{:X}'.format(ord(s)))

output

U+1F600

If you have Python 3.6+, you can make it even shorter (and more efficient) by using an f-string:

s = '😀'
print(f'U+{ord(s):X}')

BTW, if you want to create a Unicode escape sequence like '\U0001F600' there's the 'unicode-escape' codec. However, it returns a bytes string, and you may wish to convert that back to text. You could use the 'UTF-8' codec for that, but you might as well just use the 'ASCII' codec, since it's guaranteed to only contain valid ASCII.

s = '😀'
print(s.encode('unicode-escape'))
print(s.encode('unicode-escape').decode('ASCII'))

output

b'\\U0001f600'
\U0001f600

I suggest you take a look at this short article by Stack Overflow co-founder Joel Spolsky The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!).