Answer:
The function in Python is as follows:
def d2x(d, x):
    if d > 1 and x>1 and x<=9:
        output = ""
        while (d > 0):
            output+= str(d % x)
            d = int(d / x)
        output = output[::-1]
        return output
    else:
        return "Number/Base is out of range"
Explanation:
This defines the function
def d2x(d, x):
This checks if base and range are within range i.e. d must be positive and x between 2 and 9 (inclusive)
    if d >= 1 and x>1 and x<=9:
This initializes the output string
        output = ""
This loop is repeated until d is 0
        while (d > 0):
This gets the remainder of d/x and saves the result in output
            output+= str(d % x)
This gets the quotient of d/x
            d = int(d / x) ----- The loop ends here
This reverses the output string
        output = output[::-1]
This returns the output string
        return output
The else statement if d or x is out of range
<em>    else:</em>
<em>        return "Number/Base is out of range"</em>
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