ERROR SOLUTION OF SERIAL COMMUNICATION PROGRAM USING pySerial

#import sys
import serial
from serial import SerialException
import datetime

# Decompose seconds into hours, minutes, and seconds
def get_hms(td):
    m,s = divmod(td.seconds,60)
    h,m = divmod(m,60)
    return(h,m,s)

# English format conversion for datetime
def get_endate(dt):
    weekList=['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat' 'Sun']
    monthList=['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
    weekNo=dt.weekday()
    monthNo = dt.month

    US>%s='{0}{1}{2}\n'.
                weekList [weekNo],
                monthList [monthNo-1],
                dt.strftime ("%d%H:%M:%S%Y")
    returns


# program initiation
N_Smpl = 10000
N_data=20000

# argv = sys.argv;
#######exit()

fname_out="data1.txt"# destination file
portName="COM3"# Variable to store COM port numbers
Variable to store BaudRate=int(115200)# BaudRate
flowcontrol="CTSRTS"#Variables that store the flow control type

if(flowcontrol!="CTSRTS" and flowcontrol!="none"):
    print("Invalid flow control type. Please specify one of CTSRTS, none")
    print("\n\n")
    # print("%s max min step blk fname1 fname2comN baud flow\n\n", argv[0])
    print("max Eb/No maximum\n")
    print("min Eb/No minimum\n")
    print("step Eb/No step value\n")
    print("blk transmit blocks\n")
    print("fname1 output filename\n")
    print("fname2 output filename (from PIC)\n")
    print("comN COM port number example COM1\n")
    print("baud baud rate value\n")
    print("flow Type of Flow Control to Use CTSRTS, none\n")
    exit()

ByteSize=serial.EIGHTBITS #StopBitLength
Parity=serial.PARITY_NONE#parity
StopBits=serial.STOPBITS_ONE #StopBits
RtsCts=False#RTSCTS Enabled/Disabled
if(flowcontrol=="CTSRTS"):
    RtsCts = True

# Apply COM port settings
ser=serial.Serial("COM3",baudrate=115200,parity=serial.PARITY_NONE,timeout=None)

# Clearing Buffers
ser.reset_input_buffer()

# Open file in postscript mode
fp = open(fname_out, 'a')
# Obtaining the current time
starttime=datetime.datetime.now()
s='# Program start time: {0}\n'.format(get_endate(starttime))
fp.write(s)
#s='# Run command: {0} {1}{2}{3}{4}\n'.format(argv[0], argv[1], argv[2], argv[3], argv[4])
fp.write(s)

# Port Open Processing
if(ser.is_open==False):

    try:
        ser.open()
    exceptSerialException:
        print(" output file open error!!")
        exit()

print("Communicate with PIC")

TXstarttime=datetime.datetime.now()

j = 0

while (True):
    # if(j%1000) == 0:print("{}").format(j)
    # start of data reception
    toReadBytes=N_data
    D_PIC = ser.read (toReadBytes)

    # file addition process

    forkin range(1,N_Smpl):
        flag = 0
        if((D_PIC[2*k]&128)==128):
            flag = 1
            d=(3&D_PIC[2*k])*256+D_PIC[2*k+1]
            c=j*N_Smpl+k
            s='{0}{1}\n'.format(d,c)
            fp.write(s)

    # Show elapsed time
    td = datetime.datetime.now() - TXstarttime
    s='#{0}Time elapsed: {1:d}[sec]\n'.format(j,td.seconds)
    fp.write(s)

    if(flag==1): 
        break
        j + = 1


# COM port closed
ser.close()

# Show end time
endtime = datetime.datetime.now()
s='# Program end time: {0}\n'.format(get_endate(endtime))
fp.write(s)

# Show elapsed time
day = td.days
(hour, min, sec) = get_hms(td)

s='# Processing time: {0} days {1} hours {2} minutes {3} seconds \n'.format (day, hour, min, sec)
fp.write(s)
s='=============================================\n'
fp.write(s)
fp.close()

print("Finish data retrieval: (exit with return key)")
input()

C:\python>python LogPIC32Py2.py
Start communicating with the PIC
Traceback (most recent call last):
File "C:\python\LogPIC32Py2.py", line 103, in<module>
    if((D_PIC[2*k]&128)==128):
IndexError: index out of range

for kin range(1,N_Smpl):
    flag = 0
    try:
        if((D_PIC[2*k]&128)==128):
            flag = 1
            d=(3&D_PIC[2*k])*256+D_PIC[2*k+1]
            c=j*N_Smpl+k
            s='{0}{1}\n'.format(d,c)
            fp.write(s)
    except IndexError:
        print('Error')
        print(len(D_PIC))
        print(2*k)
        os.system('PAUSE')

C:\python>python LogPIC32Py2.py
Start communicating with the PIC
Error
0
2
Press any key to continue.
Error
0
4
Press any key to continue.
Error
0
6
Press any key to continue.