Base converter on Python 3

convert_base.py

from string import ascii_uppercase, digits

alphabet = digits + ascii_uppercase


def convert_base(n: str, from_base: int = 10, to_base: int = 10) -> str:
    if isinstance(n, str):
        n = int(n, from_base)

    if n < to_base:
        return alphabet[n]
    return convert_base(n // to_base, from_base, to_base) + alphabet[n % to_base]


# Usage:
print(convert_base('FAAC', from_base=16, to_base=2))  # 1111101010101100