Plot not showing up using matplotlib - python-3.x

Question

I am trying to plot two true positive rate and false positive rate values for two different cases. While plotting, the second plot cancels out the display of the first sort of.
import math
import numpy as np
import random
import os
import sys
from scipy.spatial import distance
from matplotlib import pyplot as plt
import pandas as pd
def fextract(fname1, fname2):
file1 = open(fname1,'r')
file2 = open(fname2,'r')
cnt = 122
data1 = file1.readlines()
data2 = file2.readlines()
print(len(data1))
tpr = np.zeros((1,cnt))
fpr = np.zeros((1,cnt))
cnt2 = 0
for x in data1:
if(cnt2 == 120):
break
tpr[0,cnt2] = float(x)
cnt2 = cnt2 + 1
cnt2 = 0
for x in data2:
if(cnt2 == 120):
break
fpr[0,cnt2] = float(x)
cnt2 = cnt2 + 1
return tpr, fpr
def plotfig(x1,y1,x2,y2):
f1 = plt.figure()
lg = plt.plot(x2[0,:], y2[0,:], label="Skin Color (With Chrominance)")
lg = plt.plot(x1[0,:], y1[0,:], label="Skin Color")
plt.legend(loc='best')
plt.xlabel('False Positive Rate')
plt.ylabel('True Positive Rate')
plt.show()
tpr,fpr = fextract('tp.txt','fp.txt')
tpr2,fpr2 = fextract('tp2.txt','fp2.txt')
tpr3,fpr3 = fextract('tp3.txt','fp3.txt')
tpr4,fpr4 = fextract('tp7.txt','fp7.txt')
tpr5,fpr5 = fextract('tp8.txt','fp8.txt')
tpr6,fpr6 = fextract('tp9.txt','fp9.txt')
plotfig(fpr,tpr,fpr4,tpr4)
plotfig(fpr2,tpr2,fpr5,tpr5)
plotfig(fpr3,tpr3,fpr6,tpr6)
As seen above, the the orange line stops midway and the blue gets plotted completely.