misha random

#!/usr/bin/env python

import sys
import os
import string
import random
import fileinput

if sys.version_info < (2, 5):
    import md5
else:
    from hashlib import md5

def random_str(y):
    return "".join(random.choice(string.ascii_letters) for x in range(y))

m = md5()
with open(__file__) as f:
    file_content = f.read()
    if sys.version_info >= (3,):
        m.update(file_content.encode())
    else:
        m.update(file_content)

print("Name: %s" % os.path.basename(__file__))
print("Size: %d bytes" % os.stat(__file__).st_size)
print("Hash: %s" % m.hexdigest())
print("""On each run file changes its size, hash sum and filename.
It's impossible to find it then.
It's not like itself now. Each copy has its own identity.""")

file_rows = file_content.rstrip("\n").split("\n")
file_rows[-1] = ("### LAST HASH: %s RANDOM STR: %s" % (
                 m.hexdigest(), random_str(random.randint(1, 255))))
with open(__file__, "w") as f:
    f.write("\n".join(file_rows))

basedir = os.path.dirname(__file__)
new_name = random_str(10)
os.rename(__file__, "%s.py" % os.path.join(basedir, new_name))

if sys.version_info >= (3,):
    input("Press enter ")
else:
    raw_input("Press enter ")

### LAST HASH: b04f380f30bfdcc6e8bd53cad7fdd96c RANDOM STR: eSZGCFFnAxRuOtpbIJhyQRayCvUXmIVzPBDvxYFYRVsiJwwFMWylmAvMcXyAcskRmSskcikljwQumhOVQkBaKokPvLfCfmJKnYMwdqxvsQANABbiqtTBXWMkOCfqrmjKRWgjzZzvwRepmLjRAlODTPvUljdIpSKxuZXUbrcQEDTf