How do I get data from Nonin Xpod PulseOxy Sensor to Raspberry Pi

I am finally able to get the data from the sensor using the following code:

import serial,time,sys
#returns non zero value if the bit is set
def testbit(value,bit):
return (value & 1 << bit)
#converts raw string to hexadecimal
def stringAsHex(s):
    return ":".join("{:02x}".format(ord(c)) for c in s)

#extract the information from a packet
def processpacket(p):
    msb=p[19][3]
    lsb=p[20][3]
    hr= ((msb<<7)|(lsb)) & 0x1ff
    emsb=p[21][3]
    elsb=p[22][3]
    ehr= ((emsb<<7)|(elsb)) & 0x1ff
    oxy=p[8][3]
    ol= oxy & 0x7f
    eoxy=p[16][3]
    eol= eoxy & 0x7f
    #print "Pulse Rate:", hr
    #print "Oxygen Level:", ol
    #if hr != 511 and  ol !=127 :
    if hr > 40 and hr < 200 and ol > 85 and ol < 127:
        #print "Pulse Rate:", hr
        #print "Extended Pulse Rate:",ehr
        #print "Oxygen Level:", ol
        #print "Extended Oxygen Level:",eol
        return hr,ol
     else:
        #print "Place your finger"
        hr=0
        ol=0
        return hr,ol

def readsensor(n):
    sd=[]
    val=[]
    sensor = serial.Serial('/dev/ttyUSB0',timeout=1,baudrate=9600)
    frame=[]
    fc=0
    packet=[]
    while True:
    frame=[]
            data = sensor.read()
            d=stringAsHex(data)
            intdata=int(d,16)
    #print 'loop 0'
            #print intdata 
            if intdata == 1:
                    data1 = sensor.read()
                    d1=stringAsHex(data1)
                    intdata1=int(d1,16)
                    #print 'if intdata == 1 sensor.read:',intdata1
                    tb = testbit(intdata1,0)
                    #print "test bit:", tb
                    if tb > 0 :
            #print 'packet began'
                            frame.append(intdata)
                            frame.append(intdata1)
                            fc = 2
            cnt = 0
            wc=0
                            while ( fc <= 125 ):
                wc = wc + 1
                #print 'while inside',wc
                                    data = sensor.read()
                                d=stringAsHex(data)
                                    intdata=int(d,16) 
                if len(frame)<=5:
                    frame.append(intdata)
                else:
                    #print 'oversized frame'
                    break
                #print 'fc',fc
                                fc = fc + 1


                if fc%5 == 0:
                    #print 'if fc%5 == 0'
                                            #print frame
                                            if frame[0] == 1:
                        cnt = cnt + 1
                        #print cnt
                                                    packet.append(frame)
                                                    frame=[]
                        #print 'frame empty'
                                            else:
                        #print 'else fc%5',fc
                        break

                if fc == 126:
                                            n = n - 1
                                            if n >= 0:
                                                    h,o= processpacket(packet)
                        sd.append([h,o])
                        #print sd
                                                    packet=[]
                        #print 'packet empty'
                                                    #print "***********Packet received***********"
                                                    fc = 1
                                            else:
                                                    return sd




        else:
            continue
    else:
        continue
print readsensor(20)

I realized that the sensor was giving characters. Then I got the data converted it into integer and put it in the frames and organized the frames into a packet(the frame and packet details were mentioned in the data sheet). Then I extracted the sensor readings from the packet.
The frame and packet are implemented using lists in python.

import serial

def stringAsHex(s):
    return ":".join("{:02x}".format(c) for c in s)

def readFrame():
    while True:
        b1 = sensor.read()
        if len(b1) > 0:
            if int(stringAsHex(b1), 16) == 0b1:
                b2 = sensor.read()
                b3 = sensor.read()
                b4 = sensor.read()
                b5 = sensor.read()
                #print "Byte: ", stringAsHex(b1), stringAsHex(b2), stringAsHex(b3), stringAsHex(b4), stringAsHex(b5)
                return [b1, b2, b3, b4, b5]
                break

# This function will keep running until the frame is valid, by checking the OUT OF TRACK bit.
def readValidFrameSet():
    sensor.reset_input_buffer()
    while True:
        frame1 = readFrame()
        if int(stringAsHex(frame1[1]), 16) & 0b1:
            #print("first frame!")
            frame2 = readFrame()
            frame3 = readFrame()
            # We only care about frame 1 to 3 so far
            hr1 = ((int(stringAsHex(frame1[3]), 16) & 0b11) << 7)
            hr2 = (int(stringAsHex(frame2[3]), 16) & 0b1111111)
            hr = hr1 + hr2
            spo = int(stringAsHex(frame3[3]), 16) & 0b1111111
            #print "HR=", hr, " SPO2=", spo
            if ((int(stringAsHex(frame1[1]), 16) & 0b10000 == 0) & (spo != 0 & hr < 300)):
                # Out of track bit is not set, frame is valid
                #print stringAsHex(frame1[3])
                #print stringAsHex(frame2[3])
                #print stringAsHex(frame3[3])
                sensor.reset_input_buffer()
                return [hr, spo]
            #else:
                # Out of track bit is set, frame is invalid
                #print("OUT OF TRACK")

# should default to 9600, 8 data bits, 1 stop bit, but feel free to use the constructor arguments to configure it
sensor = serial.Serial('/dev/ttyUSB0', timeout=1)
sensor.flushInput()
while True:
    # Run this once if you only want 1 set values. result[0]=heart rate (in BPM), result[1]= spo2%
    result = readValidFrameSet()
    print("HR=", result[0], " SPO2=", result[1])

Code on my GitHub: https://github.com/vaibhavbachuwar/Nonin-XPOD-Pulse-Oximter/blob/main/noninxpod.py