Answer 1

Yeah.

x = 42
y = f'Number is {x}.'
print(y)
# Output: Number is 42.

Answer 2

f marks a so-called formatstring.

If there's an f in front of the literal, everything in {} will be evaluated and inserted into the string.

There's also the more conventional and sometimes helpful method format that works comparably:

print('Number is {}'.format(x))