python pyqt5 计算下载文件的进度百分比

python pyqt5 计算下载文件的进度百分比

思路

1. 从远程服务器获取文件大小
2. 每次只下载固定大小
3. 下载次数 × 固定大小 = 已下载大小
4. 已下载大小 ➗ 文件大小 * 100 即为下载进度百分比

代码

import subprocess
import requests
from contextlib import closing

# 下载文件
r = requests.get("https://***.com/_latest.exe",stream=True)
with closing(r) as response:
	# 每次下载的大小
    chunk_size = 1024
    # 文件总大小
    content_size = int(response.headers['content-length'])
    # 下载次数
    data_count = 0
    # 下载数据写入文件
    with open('_latest.exe','wb') as file:
        for data in response.iter_content(chunk_size=chunk_size):
            file.write(data)
            data_count = data_count + len(data)
            # 进度
            now_jd = (data_count / content_size) * 100
            print(f'文件已下载：({data_count}字节/{content_size}字节) {round(now_jd, 2)}%')

# 下载完成后打开
subprocess.call(['_latest.exe'])