python如何实现图片压缩

本工具是通过将图片上传到第三方网站tinypng，进行压缩后下载，覆盖本地图片，tinypng是一个强大的图片处理网站，目前最可靠的无损压缩网站。

代码如下：

import requestsfrom idna import unicodefrom selenium import webdriverimport timeimport osbrowser = webdriver.Firefox(executable_path=’/Users/lyf/Library/Google/geckodriver’)def tiny_png(url): # browser.get(’https://tinypng.com/’) upload_file = browser.find_element_by_tag_name('input') try: upload_file.send_keys(url) browser.implicitly_wait(20) a = browser.find_element_by_link_text(’download’) img_url = a.get_attribute(’href’) print(img_url) r = requests.get(img_url) with open(url, ’wb’) as f: f.write(r.content) browser.refresh() time.sleep(2) except Exception as e: print(e)def is_need_compress(img_path): ''' 判断是否需要压缩处理 >10k 进行压缩处理 :param img_path: :return: ''' if img_path.endswith(’.jpg’) or img_path.endswith(’.png’): size = os.path.getsize(img_path) / 1024 if size > 10.0: print(’文件大小:%sk’ % size) return True return Falsedef file_loop(file_path): ''' 遍历文件夹 :param file_path: :return: ''' files = os.listdir(file_path) for fi in files: fi_d = os.path.join(file_path, fi) if os.path.isdir(fi_d): file_loop(fi_d) else: child_path = os.path.join(file_path, fi_d) print(child_path) if is_need_compress(child_path):tiny_png(child_path)if __name__ == '__main__': file_path = '/Users/lyf/AndroidStudioProjects/fubei/new-fubei-android-2.5-up/app/src/main/assets/www/assets' browser.get(’https://tinypng.com/’) file_loop(file_path)

改进版

优化点：

1.遍历完成本地文件夹再去上传网站

2.所有图片压缩完成再去下载

3.启动多线程下载

4.设定时间为加载完网络就去上传文件（非常非常重要，提速N倍）

import requestsfrom selenium import webdriverimport timeimport osimport _threadimport threadingfrom selenium.webdriver.support import expected_conditions as ECfrom selenium.webdriver.support.wait import WebDriverWaitfrom selenium.webdriver.common.by import By# browser = webdriver.Firefox(executable_path=’/Users/lyf/Library/Google/geckodriver’)browser = Noneimage_map = {}compress_list = []def tiny_png(url): ''' 打开网站进行图片上传下载 :param url: :return: ''' try: upload_file = WebDriverWait(browser, 10).until( EC.presence_of_element_located((By.TAG_NAME, 'input')) ) upload_file.send_keys(url) a = WebDriverWait(browser, 20).until( EC.presence_of_element_located((By.LINK_TEXT, 'download')) ) img_url = a.get_attribute(’href’) compress_list.remove(url) print(img_url) image_map[url] = img_url _thread.start_new_thread(sleep, (4,)) print(’刷新网页’) browser.refresh() time.sleep(2) except Exception as e: print(e.__str__()) browser.execute_script(’window.stop()’)def sleep(delay): ''' 一定的时间后 未加载完网页 只要控件加载出来就可以停止网页加载 :param delay: :return: ''' browser.set_page_load_timeout(delay) browser.set_script_timeout(delay)def down_img(file_path, down_url): ''' 下载图片覆盖原地址 :param file_path: :param down_url: :return: ''' r = requests.get(down_url) with open(file_path, ’wb’) as f: f.write(r.content) print(’下载完成：%s’ % down_url)def is_need_compress(img_path): ''' 判断是否需要压缩处理 >10k 进行压缩处理 :param img_path: :return: ''' if img_path.endswith(’.jpg’) or img_path.endswith(’.png’): size = os.path.getsize(img_path) / 1024 print(img_path) print(’文件大小:%sk’ % size) if size > 5000.0: print(’*****’ * 30) print(’这么大的图片搞笑吗’) print(img_path) print(’*****’ * 30) if size > 0.0 and size < 10.0: return True return Falsedef file_loop(file_path, compress_list): ''' 遍历文件夹 :param file_path: :return: ''' files = os.listdir(file_path) for fi in files: fi_d = os.path.join(file_path, fi) if os.path.isdir(fi_d): file_loop(fi_d, compress_list) else: child_path = os.path.join(file_path, fi_d) if is_need_compress(child_path):compress_list.append(child_path)def down_all(): ''' 下载所有的图片 :return: ''' thread_list = [] for k, v in image_map.items(): print(’key:%s value:%s’ % (k, v)) th = threading.Thread(target=down_img, args=(k, v)) th.start() thread_list.append(th) for r in thread_list: r.join()def loop_press(): ''' 轮询获取下载地址 :return: ''' for url in compress_list: tiny_png(url)def start_browser(): ''' 启动浏览器 :return: ''' global browser browser = webdriver.Firefox(executable_path=’/Users/lyf/Library/Google/geckodriver’) _thread.start_new_thread(sleep, (10,)) print(’加载网页’) try: browser.get(’https://tinypng.com/’) except: browser.execute_script(’window.stop()’)if __name__ == '__main__': start_time = time.time() file_path = '/Users/lyf/Desktop/www/assets' # 获取本地所有需要压缩的图片 file_loop(file_path, compress_list) print(’符合条件的图片有%s张’ % len(compress_list)) start_browser() loop_press() while len(compress_list) > 0: browser.quit() start_browser() loop_press() # 多线程下载拿到所有返回下载的地址 down_all() end = time.time() time_m = end - start_time print('time: ' + str(time_m)) browser.quit()

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