Python





```python
import subprocess
f = subprocess.Popen(['tail', '-F', "/var/log/xferlog"], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
while True:
    line = f.stdout.readline()
    print(line)
```

Python tail -f 处理 浏览 实时日志

Python





```python
import json
import xmltodict
d = xmltodict.parse("""
   <mydocument has="an attribute">
     <and>
       <many>elements</many>
       <many>more elements</many>
     </and>
     <plus a="complex">
       element as well
     </plus>
   </mydocument>
""")
print(json.dumps(d, indent=4))
xml_res = xmltodict.unparse(d, pretty=True)
print(xml_res)
```

Python xml 转 dict 转 json

参考：





[https://stackoverflow.com/questions/50807744/apply-css-class-to-pandas-dataframe-using-to-html](https://stackoverflow.com/questions/50807744/apply-css-class-to-pandas-dataframe-using-to-html)

Python Pandas html CSS 表单处理

Python





```python
import ctypes
import os
import platform
import sys
def get_free_space_mb(folder):
    """ Return folder/drive
     space (in bytes)
    """
    if platform.system() == 'Windows':
        free_bytes = ctypes.c_ulonglong(0)
        ctypes.windll.kernel32.GetDiskFreeSpaceExW(ctypes.c_wchar_p(folder), None, None, ctypes.pointer(free_bytes))
        return free_bytes.value / 1024 / 1024 / 1024
    else:
        st = os.statvfs(folder)
        return st.f_bavail * st.f_frsize / 1024 / 1024 / 1024.
if __name__ == '__main__':
    print("这个目录剩余空间:", get_free_space_mb("/run/user/1009"), "G")
```

结果：

这个目录剩余空间: 12.574710845947266 G

Python 统计磁盘目录剩余空间大小 硬盘

Python





```python
import requests  # 发送HTTP 请求模块
import json  # json 解析模块
# cv2 转 base64
import base64
import cv2
import urllib
def encode_image(filename):
    """
    编码图片
    :param filename: str 本地图片文件名
    :return: str 编码后的字符串
        eg:
        src="data:image/gif;base64,R0lGODlhMwAxAIAAAAAAAP///
            yH5BAAAAAAALAAAAAAzADEAAAK8jI+pBr0PowytzotTtbm/DTqQ6C3hGX
            ElcraA9jIr66ozVpM3nseUvYP1UEHF0FUUHkNJxhLZfEJNvol06tzwrgd
            LbXsFZYmSMPnHLB+zNJFbq15+SOf50+6rG7lKOjwV1ibGdhHYRVYVJ9Wn
            k2HWtLdIWMSH9lfyODZoZTb4xdnpxQSEF9oyOWIqp6gaI9pI1Qo7BijbF
            ZkoaAtEeiiLeKn72xM7vMZofJy8zJys2UxsCT3kO229LH1tXAAAOw=="
    """
    # 1、文件读取
    ext = filename.split(".")[-1]
    with open(filename, "rb") as f:
        img = f.read()
    # 2、base64编码
    data = base64.b64encode(img).decode()
    # 3、图片编码字符串拼接
    src = "data:image/{ext};base64,{data}".format(ext=ext, data=data)
    return src
png_uri = encode_image(r"picture\444.png")
url = 'http://smoking.market.alicloudapi.com/ai_image_detect/ai_smoking/v1'
# 请求头
headers = {
    # 根据API的要求，定义相对应的Content - Type
    "Content-Type": "application/x-www-form-urlencoded; charset=utf-8",
    # 权限指定 APPCODE
    'Authorization': 'APPCODE 6ee3b7d95c9d4dce9ab38df723ec7efd'
}
a = "data:image/png;base64,"
r = requests.post(url, headers=headers, data={"IMAGE": png_uri})
print(r.text)
```


参考 ：https://blog.csdn.net/mouday/article/details/93489508