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 requests
from idna import unicode
from selenium import webdriver
import time
import os

browser = 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 False

def 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 requests
from selenium import webdriver
import time
import os
import _thread
import threading
from selenium.webdriver.support import expected_conditions as EC

from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.common.by import By

# browser = webdriver.Firefox(executable_path='/Users/lyf/Library/Google/geckodriver')

browser = None

image_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 False

def 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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