Thousands separators in Python f-strings: Format with commas

Have a Python number, and want commas before every 3 digits? Use , in an f-string:

x = 1234567890
print(f'{x:,}') # 1,234,567,890

Floats, too:

x = 987654321.4567890
print(f'{x:,}')  # 987,654,321.456789

Combine , and .2f:

print(f'{x:,.2f}') # 987,654,321.46