import time
from Tkinter import *
 
class TimestampClock(Frame):
    def __init__(self, root):
        Frame.__init__(self, root)
        self.pack()
        self.time = Label(self, text=int(time.time()))
        self.time.config(fg='red', font=('Monospace', 20, 'bold'))
        self.time.pack(padx=10, pady=10)
        self.update()
 
    def update(self):
        self.time.config(text=int(time.time()))
        self.after(1000, self.update)
 
if __name__ == "__main__":
    root = Tk()
    root.title("Timestamp-Clock")
    root.wm_attributes("-topmost", 1)
    root.resizable(0,0)
    root.minsize(300,50)
    TimestampClock(root).mainloop()

from wsgiref.simple_server import make_server, demo_app
httpd = make_server('', 8000, demo_app)
httpd.handle_request()

sudo patch < wsgiref.patch

import os
import time
import errno
 
class FileLockException(Exception):
    pass
 
class FileLock(object):
    """ A file locking mechanism that has context-manager support so 
        you can use it in a with statement. This should be relatively cross
        compatible as it doesn't rely on msvcrt or fcntl for the locking.
    """
 
    def __init__(self, file_name, timeout=10, delay=.05):
        """ Prepare the file locker. Specify the file to lock and optionally
            the maximum timeout and the delay between each attempt to lock.
        """
        self.is_locked = False
        self.lockfile = os.path.join(os.getcwd(), "%s.lock" % file_name)
        self.file_name = file_name
        self.timeout = timeout
        self.delay = delay
 
 
    def acquire(self):
        """ Acquire the lock, if possible. If the lock is in use, it check again
            every `wait` seconds. It does this until it either gets the lock or
            exceeds `timeout` number of seconds, in which case it throws 
            an exception.
        """
        start_time = time.time()
        while True:
            try:
                self.fd = os.open(self.lockfile, os.O_CREAT|os.O_EXCL|os.O_RDWR)
                break;
            except OSError as e:
                if e.errno != errno.EEXIST:
                    raise 
                if (time.time() - start_time) >= self.timeout:
                    raise FileLockException("Timeout occured.")
                time.sleep(self.delay)
        self.is_locked = True
 
 
    def release(self):
        """ Get rid of the lock by deleting the lockfile. 
            When working in a `with` statement, this gets automatically 
            called at the end.
        """
        if self.is_locked:
            os.close(self.fd)
            os.unlink(self.lockfile)
            self.is_locked = False
 
 
    def __enter__(self):
        """ Activated when used in the with statement. 
            Should automatically acquire a lock to be used in the with block.
        """
        if not self.is_locked:
            self.acquire()
        return self
 
 
    def __exit__(self, type, value, traceback):
        """ Activated at the end of the with statement.
            It automatically releases the lock if it isn't locked.
        """
        if self.is_locked:
            self.release()
 
 
    def __del__(self):
        """ Make sure that the FileLock instance doesn't leave a lockfile
            lying around.
        """
        self.release()

with FileLock("test.txt", timeout=2) as lock:
    print("Lock acquired.")
    # Do something with the locked file

from string import ascii_uppercase, ascii_lowercase
 
def rot13(data):
    """ A simple rot-13 encoder since `str.encode('rot13')` was removed from
        Python as of version 3.0.  It rotates both uppercase and lowercase letters individually.
    """
    total = []
    for char in data:
        if char in ascii_uppercase:
            index = (ascii_uppercase.find(char) + 13) % 26
            total.append(ascii_uppercase[index])
        elif char in ascii_lowercase:
            index = (ascii_lowercase.find(char) + 13) % 26
            total.append(ascii_lowercase[index])
        else:
            total.append(char)
    return "".join(total)