flickr.py

from flickrapi import FlickrAPI

KEY = 'KEY'
SECRET = 'SECRET'

# List of sizes:
# url_o: Original (4520 × 3229)
# url_k: Large 2048 (2048 × 1463)
# url_h: Large 1600 (1600 × 1143)
# url_l=: Large 1024 (1024 × 732)
# url_c: Medium 800 (800 × 572)
# url_z: Medium 640 (640 × 457)
# url_m: Medium 500 (500 × 357)
# url_n: Small 320 (320 × 229)
# url_s: Small 240 (240 × 171)
# url_t: Thumbnail (100 × 71)
# url_q: Square 150 (150 × 150)
# url_sq: Square 75 (75 × 75)

SIZES = ["url_o", "url_k", "url_h", "url_l", "url_c"]  # order of preference

def get_photos(image_tag):
    extras = ','.join(SIZES)
    flickr = FlickrAPI(KEY, SECRET)
    photos = flickr.walk(text=image_tag,
                            extras=extras,  # get the url for the original size image
                            privacy_filter=1,  # search only for public photos
                            per_page=50,
                            sort='relevance')
    return photos

def get_url(photo):
    for i in range(len(SIZES)):
        url = photo.get(SIZES[i])
        if url:  # if url is None try with the next size
            return url

def get_urls(image_tag, max):
    photos = get_photos(image_tag)
    counter=0
    urls=[]

    for photo in photos:
        if counter < max:
            url = get_url(photo)  # get preffered size url
            if url:
                urls.append(url)
                counter += 1
            # if no url for the desired sizes then try with the next photo
        else:
            break

    return urls