heating_protocol.py

from datetime import datetime
import os
import re
import shutil

from PIL import Image, ExifTags

def get_exif_data(image):
    return {
        ExifTags.TAGS[k]: v
        for k, v in image._getexif().items()
        if k in ExifTags.TAGS
    }

dir_list = os.listdir('./images')
image_filenames = [img for img in dir_list if img.lower().endswith('.jpg')]
images = map(lambda img: Image.open('images/{}'.format(img)), image_filenames)

# Images have filenames like: "IMG_3216__14_Celsius.JPG"
celsius_rex = re.compile('\d+(?=\_Celsius)')

date_times, temperatures = [], []

for image in images:
    exif_data = get_exif_data(image)
    date_time = datetime.strptime(exif_data['DateTime'], '%Y:%m:%d %H:%M:%S')
    date_times.append(date_time)
    degrees = int(celsius_rex.search(image.filename).group())
    temperatures.append(degrees)

for date_time, temperature in zip(date_times, temperatures):
    print date_time, '|', '-' * (temperature-1), '*'