Python - adding variable inside a string

Dear Experts,

Actually having the following Python code to import .csv file and it works fine:

import csv

with open(r"C:\File.csv") as csvfile:
    rows = list(csv.reader(csvfile))
    data_header = rows[0]
    data_rows = rows[1:]
    

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I would like to restructure a little bit with adding the path to a variable as FilePath and using that in the open command, around like this (it does not work of course in this format)

import csv

FilePath = "C:\File.csv"

with open(r % FilePath) as csvfile:
    rows = list(csv.reader(csvfile))
    data_header = rows[0]
    data_rows = rows[1:]
    

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Could you please advice about the Python syntax including a variable like that?

Thanks in advance,