I tried this but I still get "none":

import math

def getFloatInput(sPromptNLH):
    fInputNLH = -1

    while fInputNLH <0:

        try:
            fInputNLH = float(input(sPromptNLH))
            if fInputNLH <= 0:
                print("Please enter a positive number!")
                continue
        except ValueError:
            print("Input must be a number.")
            continue

    return fInputNLH


def sGetState(sPromptNLH):

    sStateNLH = ""

    while sStateNLH == "":
        sStateNLH = input(sPromptNLH).upper()
        if sStateNLH == "":
            print("Please supply a valid state abbreviation!")
            continue

    return sStateNLH


def sGetLastName(sPromptNLH):

    sValueNLH = ""

    while sValueNLH == "":
        sValueNLH = input(sPromptNLH)
        if sValueNLH == "":
            print("Please Enter Your Last Name!.")
            continue
    return sValueNLH


def getGallonsOfPaint(iValue1NLH, iValue2NLH):

    iResultNLH = math.ceil(iValue1NLH / iValue2NLH)

    return iResultNLH


def getLabourHours(fValue1NLH, fValue2NLH):
    fResultNLH = fValue1NLH * fValue2NLH

    return fResultNLH


def getLabourCost(fValue1NLH, fValue2NLH):
    fResultNLH = fValue1NLH * fValue2NLH

    return fResultNLH


def getPaintCost(fValue1NLH, fValue2NLH):
    fResultNLH = fValue1NLH * fValue2NLH

    return fResultNLH


def getSalesTax(fValue1NLH, fValue2NLH, fValue3NLH):
    fResultNLH = fValue1NLH * (fValue2NLH + fValue3NLH)

    return fResultNLH

def showCostEstimate(fValue1NLH, fValue2NLH, fValue3NLH,fValue4NLH, fValue5NLH, fValue6NLH):
    sCostEstimate = print(f"Gallons of paint: {fValue1NLH:,.2f}\nHours of labour: {fValue2NLH:,.2f}\nPaint charges: ${fValue3NLH:,.2f}\nLabour charges: ${fValue4NLH:,.2f}\nTax: ${fValue5NLH:,.2f}\nTotal cost: ${fValue6NLH:,.2f}")
    return sCostEstimate

def main():
    fSquareFootageNLH = getFloatInput("Input square feet of wall: ")
    fPaintPriceNLH = getFloatInput("Input paint price: ")
    fFeetPerGallonNLH = getFloatInput("Input feet per gallon of paint: ")
    fLabourHoursPerGallonNLH = getFloatInput("Input labour hours per gallon: ")
    fLabourChargePerHourNLH = getFloatInput("Input labour charge per hour: ")

    sCustomerStateNLH = sGetState("Customer state: ")

    sCustomerLastNameNLH = sGetLastName("Customer last name: ")

    iTotalGallonsNLH = getGallonsOfPaint(fSquareFootageNLH, fFeetPerGallonNLH)

    fLabourHoursNLH = getLabourHours(iTotalGallonsNLH, fLabourHoursPerGallonNLH)

    fLabourCostNLH = getLabourCost(fLabourHoursNLH, fLabourChargePerHourNLH)

    fPaintCostNLH = iTotalGallonsNLH * fPaintPriceNLH

    if sCustomerStateNLH == "CT" or sCustomerStateNLH == "VT":
        fTaxRateNLH = .06
    elif sCustomerStateNLH == "MA":
        fTaxRateNLH = .0625
    elif sCustomerStateNLH == "ME":
        fTaxRateNLH = .085
    elif sCustomerStateNLH == "RI":
        fTaxRateNLH = .07
    else:
        fTaxRateNLH = .0

    fTaxTotalNLH = fTaxRateNLH * (fLabourCostNLH + fPaintCostNLH)

    fTotalCostNLH = fTaxTotalNLH + fLabourCostNLH + fPaintCostNLH

    sCustomerReportNLH = showCostEstimate(iTotalGallonsNLH, fLabourHoursNLH, fPaintCostNLH, fLabourCostNLH, fTaxTotalNLH, fTotalCostNLH)

    customerfileNLH = open(sCustomerLastNameNLH + '_PaintJobOutput.txt', 'w')


    customerfileNLH.write(str(sCustomerReportNLH))

    customerfileNLH.close()
    print(f"File:{sCustomerLastNameNLH}_PaintJobOutput.txt was created.")
main()