Sindbad~EG File Manager

#!/usr/lib/rads/venv/bin/python3
"""Prints a header in blue with the header block being a string"""
import sys
from rads.color import blue


def print_header(string, char='~'):
    if isinstance(string, str) and isinstance(char, str):
        holder = 80 - len(string)
        spacer = int(holder / 2 / (len(char))) * char
        header = f"{spacer} {string} {spacer}\n"
        blue(header)
    else:
        sys.exit('Usage: header.print_header("Header")')