Function for rounding up numbers in Python

round_up.py

def round_up(n, decimals=0):
    # Move significant decimal digits to the left of the decimal point
    multiplier = 10 ** decimals

    # Truncate the unneeded digits on the right of the decimal point
    sig_digits = n * multiplier // 1

    # Determine whether to round up or round down
    # Return 1 if the tenth digit is greater than or equal to 5,
    # else return 0 if less than 5
    carry = int(((n * multiplier) % 1) >= 0.5)

    # Add the 1 or 0 to the significant digit in the ones place
    # and return to the digits to their original place values
    return ((sig_digits + carry) / multiplier)