encoding string

"afile" is a previously existing file.

handle=open("afile",'r+b')
data=handle.readline()
handle.close() 
#  signgenerator is a hashlib.md5() object

signgenerator.update(data)     
hex=signgenerator.hexdigest()
print(hex) # prints out 061e3f139c80d04f039b7753de5313ce

and write this to a file

 f=open("syncDB.txt",'a')
 #hex=hex.encode('utf-8')
 pickle.dump(hex,f)
 f.close() 

But when i read back the file as

while True:
    data=f.readline()
    print(data)

This gives the output:

b'\x80\x03X \x00\x00\x00061e3f139c80d04f039b7753de5313ceq\x00.\x80\x03X \x00\x00\x00d9afd4bb6bc57679f6b10c0b9610d2e0q\x00.\x80\x03X \x00\x00\x008b70452c46285d825d3670d433151841q\x00.\x80\x03X \x00\x00\x00061e3f139c80d04f039b7753de5313ceq\x00.\x80\x03X \x00\x00\x00d9afd4bb6bc57679f6b10c0b9610d2e0q\x00.\x80\x03X \x00\x00\x008b70452c46285d825d3670d433151841q\x00.\x80\x03X \x00\x00\x00b857c3b319036d72cb85fe8a679531b0q\x00.\x80\x03X \x00\x00\x007532fb972cdb019630a2e5a1373fe1c5q\x00.\x80\x03X \x00\x00\x000126bb23767677d0a246d6be1d2e4d5cq\x00.'

How do i encode to get the same hexdigest back from these bytes?? Also I am getting some gibberish characters in syncDb.txt like "€X" after each line.How do I correct开发者_如何学JAVAly write the data in a readable form??

---

You need to unpickle the data:

pickle.load(open('syncDB.txt', 'r+b'))

What you have there is pickled data. Proof:

>>> import pickle

>>> pickle.loads(b'\x80\x03X \x00\x00\x00061e3f139c80d04f039b7753de5313ceq\x00.\x80\x03X \x00\x00\x00d9afd4bb6bc57679f6b10c0b9610d2e0q\x00.\x80\x03X \x00\x00\x008b70452c46285d825d3670d433151841q\x00.\x80\x03X \x00\x00\x00061e3f139c80d04f039b7753de5313ceq\x00.\x80\x03X \x00\x00\x00d9afd4bb6bc57679f6b10c0b9610d2e0q\x00.\x80\x03X \x00\x00\x008b70452c46285d825d3670d433151841q\x00.\x80\x03X \x00\x00\x00b857c3b319036d72cb85fe8a679531b0q\x00.\x80\x03X \x00\x00\x007532fb972cdb019630a2e5a1373fe1c5q\x00.\x80\x03X \x00\x00\x000126bb23767677d0a246d6be1d2e4d5cq\x00.') '061e3f139c80d04f039b7753de5313ce'

But there's no point in pickling a hex string. You can just put it in the file. The pickle module should be used with more complex structures, like arrays, dicts, or even classes.

---

Don't pickle the hexdigest, just write it out as text.

with open("afile",'rb') as handle:
    data=handle.readline()

signgenerator.update(data)
hex=signgenerator.hexdigest()

with open("syncDB.txt",'ab') as f:
    f.write(hex + '\n')

with open("syncDB.txt",'rb') as f:
    for data in f:
        print(data)

If you really want to use pickle, you need to use the pickle.load function to read the data back from the file.