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

seanh

def format_filename(s):
    """Take a string and return a valid filename constructed from the string.
Uses a whitelist approach: any characters not present in valid_chars are
removed. Also spaces are replaced with underscores.
 
Note: this method may produce invalid filenames such as ``, `.` or `..`
When I use this method I prepend a date string like '2009_01_15_19_46_32_'
and append a file extension like '.txt', so I avoid the potential of using
an invalid filename.
 

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

# 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

"""This is done with the os module, which has lots of methods for handling files and dirs.

<http://docs.python.org/lib/os-file-dir.html>

Effbot's page on the os module: <http://effbot.org/librarybook/os.htm>

The shutil module is useful here also: <http://docs.python.org/lib/module-shutil.html>

"""
import os

seanh

# http://www.diveintopython.org/file_handling/os_module.html

# Use a one-line list comprehension to get all the files in a given directory with a given extension.
import os
dir = '.'
ext = '.txt'
txt_files = [f for f in os.listdir(dir) if os.path.isfile(os.path.join(dir,f)) and f.endswith(ext)]

# os.path.join joins a directory and a filename into a path. You can also split a path name into directory and file with 
# os.path.split(), and you can split a filename with extension into filename and extension with os.path.splitext()

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

To create a virtual environment and install CKAN into it:

git clone git://gist.github.com/2206132.git
python 2206132/ckan-bootstrap.py pyenv

This makes a directory pyenv in the current working directory, creates a virtual environment in the pyenv dir, and installs CKAN (and all CKAN's dependencies) into the virtual environment.

Activate the virtual environment and run the CKAN tests:

rufuspollock

{
  "datasets": {
    "adur_district_spending": {
      "author": "Lucy Chambers", 
      "author_email": "", 
      "extras": {
        "spatial-text": "Adur, West Sussex, South East England, England, United Kingdom",
        "spatial": "{ \"type\": \"Polygon\", \"coordinates\": [ [ [-0.3715, 50.8168],[-0.3715, 50.8747], [-0.2155, 50.8747], [-0.2155, 50.8168], [-0.3715, 50.8168] ] ] }"
      },
      "license": "License Not Specified",