convert octal to hexdecimal

def oct_to_hex(oct):
    # write your code here
    oct_list = [int(number) for number in str(oct)]
    number_pos = len(oct_list) - 1
    decimal_list = []
    for number in oct_list:
        decimal_number = number
        for _ in range(number_pos):
            decimal_number *= 8
        number_pos -= 1
        decimal_list.append(decimal_number)
    decimal_number = 0
    for number in decimal_list:
        decimal_number += number
    hex_list = []
    while decimal_number:
        hex_list.append(decimal_number % 16)
        decimal_number = decimal_number // 16
    hex_dict = {10:"A", 11: "B", 12:"C",13:"D",14:"E", 15:"F"}
    for index, number in enumerate(hex_list):
        if number in hex_dict:
            hex_list[index] = hex_dict[number]
        else:
            hex_list[index] = str(number)
    hex_list.reverse()
    return "".join(hex_list)