don't understand alignment symbols and how this piece of code works

im taking a summer course for python and came across this python code:

num1 = input( )  # input will be 10

num2 = input( )  # input will be 20

num3 = num1 + num2

print (f'The sum is {num3:<50}')

what does this last piece do inside the curly brace {num3: <50}? What does that <50 mean??

Any help appreciated, thanks !

>Solution :

It means the value is left aligned within the given space of 50 chars which makes little sense if nothing is coming after:

>>> num3 = 3.14
>>> f'The sum is {num3:<50} hello')
'The sum is 3.14                                             hello'

From the docs on string format syntax on "<":

Forces the field to be left-aligned within the available space (this is the default for most objects).