seanh

# Write mode creates a new file or overwrites the existing content of the file. 
# Write mode will _always_ destroy the existing contents of a file.
try:
    # This will create a new file or **overwrite an existing file**.
    f = open("file.txt", "w")
    try:
        f.write('blah') # Write a string to a file
        f.writelines(lines) # Write a sequence of strings to a file
    finally:
        f.close()

seanh

# The built-in function `open` opens a file and returns a file object.
# Read mode opens a file for reading only.
try:
    f = open("file.txt", "r")
    try:
        # Read the entire contents of a file at once.
        string = f.read()
        # OR iterate over the file line-by-line:
        for line in f:
            # Do something with line.

seanh

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class MyClass {

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container contentPane = frame.getContentPane();

seanh

"""Recursively walk a directory with os.walk."""

import os

base_dir = '/home/seanh' # The directory to walk
for root, dirs, files in os.walk(base_dir):
    print 'root: ',root
    print '   dirs:'
    for d in dirs:
        print '      ',d