[Tutor] append in new file??

[Ahmed AL-Masri]

hello;

I need help in append a data in new file. the problem is the new data are generated in every run.
so at the end I should get all the changes in one file (means for all running) if I run 2 times so should get couple of data set.
note all outputs in txt file.
ex:
this is the first run data 
1.0362 1.015 1.011 0.9948 1.0024 0.9936
0.9129 0.9184 0.9868 0.9682 0.975 0.8953
1.0627 1.0517 1.0306 1.0387 1.0501 1.0485
1.0467 1.0342 1.0389 1.0109 1.0107 1.0066

next run the data changes in the same output file 
1.020 1.043 1.111 0.343 1.454 1.999
0.9129 0.9184 0.9868 0.9682 0.975 0.8953
1.0555 1.2222 1.333 1.4444 1.2222 1.2222
1.1111 1.1111 1.1111 1.1111 1.1111 1.1111

the appended file should be 
1.0362 1.015 1.011 0.9948 1.0024 0.9936
0.9129 0.9184 0.9868 0.9682 0.975 0.8953
1.0627 1.0517 1.0306 1.0387 1.0501 1.0485
1.0467 1.0342 1.0389 1.0109 1.0107 1.0066
1.020 1.043 1.111 0.343 1.454 1.999
0.9129 0.9184 0.9868 0.9682 0.975 0.8953
1.0555 1.2222 1.333 1.4444 1.2222 1.2222
1.1111 1.1111 1.1111 1.1111 1.1111 1.1111

more run more data will generate.

I tried so many times without any result.
t=open('old data'.txt')
d=open('new data.txt','w')

while True:
    line=t.readline()
    if len(line) ==0:
  break
    volt=line.split()
    volt=map(float, volt)
    for i in range (len(line.split())):
        d.write(str(volt[i])+' ')
    d.write('\n')
d.close

but this only bring as same as the old file.

also I found some codes from the committee and tried but still not working.
import sys

def check_dup(fd1):
    print fd1
    fd1.seek(0,0)
    list1=[]
    while not done:
        x = fd1.readline()
        if x == "":
            break
        else:
            list1.append(x)
    return list1


fname = 'new data.txt'

fd = open(fname,'a+')
print fd

t=open('old data'.txt'
while not done:
    while True:
        line=t.readline()
        if len(line) ==0:
            break
        volt=line.split()
        volt=map(float, volt)
        for i in range (len(line.split())):
            print str
            flag = check_dup(fd)
            print flag
            fd.seek(0,2)
            fd.write(str(volt[i]) + ' ')
        fd.write('\n')
    break

looking forward for prompt response,
best regards,

Ahmed Naufal  
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