How to calculate length of string in pixels for specific font and size?

Question

If the font, e.g. "Times New Roman", and size, e.g. 12 pt, is known, how can the length of a string, e.g. "Hello world" be calculated in pixels, maybe only approximately?

I need this to do some manual right alignment of text shown in an Windows application, so I need to adjust the number spaces to get the alignment.

Answer 1

Based on comment from @Selcuk, I found an answer as:

from PIL import ImageFont
font = ImageFont.truetype('times.ttf', 12)
size = font.getsize('Hello world')
print(size)

which prints (x, y) size as:

(58, 11)

Here it is as a function:

from PIL import ImageFont

def get_pil_text_size(text, font_size, font_name):
    font = ImageFont.truetype(font_name, font_size)
    size = font.getsize(text)
    return size

get_pil_text_size('Hello world', 12, 'times.ttf')