A script that downloads images. Script was design with the intent of teaching basic Python programming skills

download_image.py

import os
import StringIO

# import the request module
import requests
from PIL import Image

# Storing the image URL in a constant variable
IMAGE_URL = 'http://www.distractify.netdna-cdn.com/wp-content/uploads/2014/08/slugsolos-1-620x.jpg'

# Create a list of image URL's
IMAGE_URLS = [IMAGE_URL for i in xrange(3)]

SIZE = 128, 128


def get_image(binary):
    """Create an image object using
    the binary code.
    """
    return Image.open(StringIO.StringIO(binary))

def resize_image(image, size=(128,128)):
    """Resizes image
    """
    image.thumbnail(size, Image.ANTIALIAS)
    return image

def rotate_image(image, degrees):
    """Rotate an image by so-many degrees
    """
    return image.rotate(degrees)

def save_thumbnail(binary, filename):
    """Saves a thumbnail version
    of an image.
    """
    image = get_image(binary)
    image = resize_image(image)
    image.save(filename, 'JPEG')

def make_dir(directory):
    """Make directory if it does not exist
    """
    if not os.path.exists(directory):
        os.makedirs(directory)

def download_images(directory):
    """This function downloads images
    """
    # loop through images
    for index, image_url in enumerate(IMAGE_URLS, 1):

        image_url = image_url.replace('slugsolos-1', 'slugsolos-{}'.format(index))

        # Geting a request object
        r = requests.get(image_url)

        # im = get_image(r.content)
        # im = rotate_image(im, 180)
        # im.show()
        # im.thumbnail(SIZE, Image.ANTIALIAS)
        # im.save('thumbnail.jpg', 'JPEG')

        # Open image.jpg file
        # Write content to image.jpg file
        # Close image.jpg file
        file_name = 'image-{}.jpg'.format(index)
        # file_name = os.path.basename(image_url)

        save_thumbnail(r.content, os.path.join('thumbnails', file_name))

        file_name = os.path.join(directory, file_name)
        with open(file_name, 'wb') as image_file:
            image_file.write(r.content)


if __name__ == '__main__':
    make_dir('images')
    make_dir('thumbnails')
    download_images('images')

pyladies-09-17-2014.md

Downloading an image to learn Python

1. Making a virtual environment

Virtual environments create sandboxes for your code. So that other Python packages that are installed for other programs do not interfere with your current project.

virtualenv venv
source venv/bin/activate

2. Install python packages using pip

PIP is your package manager. It allows you to easily install and uninstall versions of python packages from the Python Package Index https://pypi.python.org/pypi.

pip install requests
pip uninstall requests
pip freeze
pip freeze > requirements.txt

Creating a requirements.txt file is a convention that allows you to more easily install multiple python packages.

pip install -r requirements.txt 

3. Print statements, functions, docstrings, comments, constant variables, lists, loops, writing to a file, creating directories, classes/instances,

Summary of what we'll be covering and what code we'll be creating in order to cover some of these subjects.

• print statements
• functions
• docstrings
• comments
• variables
• lists
• conditionals
• loops
• files
• directories
• classes and instances

Building the code

• Calling a function (calling script, functions, variables, docstring)
• Download an image (importing, writing a file)
• Download multiple times (lists, looping)
• Download multiple images (string.format)
• Making directories (making, detecting, and creating paths)
• Manipulating images (binary data, classes, instances, and methods)

For Windows folks, this may be handy: http://www.tylerbutler.com/2012/05/how-to-install-python-pip-and-virtualenv-on-windows-with-powershell/

Alazilla,

I just got a new Windows machine last week. My first personal Windows box in ~7 years. I'm going to use the MESS out of that link. Thanks!