Python assignment need help

Question

I am new to programing and am having difficulties writing a program dealing with files. The program is to read a file, calculate an employees pay and an updated YTD pay total. After calculations the program will write to a new file. I can not get the program to do the calculations or make, write, or save the updated file.

This is what I have so far:

empName = ""
prevYTD = 0.0
payRate = 0.0
hoursWorked = 0.0

updatedYTD = 0.0
currentPay = 0.0

eof = False
recordCount = 0

def startUp():
    global empFile
    print "\n\n" + "PAYROLL REPORT".center(110)+"\n"
 print "Employee Name".ljust(30) + "Previous YTD".ljust(18) + \
      "Updated YTD".ljust(18) + "Pay Rate".ljust(13) + \
      "Hours Worked".ljust(19) + "Current Pay".ljust(8)
 print "-"* 109

def readFile():
    global empName, prevYTD, payRate, hoursWorked, eof
    empRec = jobInfo.readline()
    if empRec == "":
       eof = True
    else:
        empName = empRec[:25]
        prevYTD = float(empRec[25:40])
        payRate = float(empRec[40:55])
        hoursWorked = float(empRec[55:])
        eof = False

def processRecords():
    global recordCount
    while not eof:
        recordCount +=1
        printRecord()
        readFile()

def calcPay():
global prevYTD, updatedYTD, payRate, hoursWorked, currentPay, eof
currentPay == payRate*hoursWorked
updatedYTD == currentPay+prevYTD

def printRecord():
     print empName, prevYTD,updatedYTD, payRate, hoursWorked, currentPay


def closeUp(): 
     jobInfo.close()
     print "\nNumber of records in the file was",recordCount

jobInfo = open("payroll_Assignment#7.txt","r")
jobInfo = open("payroll_Assignment#7.txt","w")

startUp()
readFile()
processRecords()
calcPay()
printRecord()
closeUp()