No such file or directory: '\uploads\03.jpeg'
相对路径：加点，或者直接绝对路径(尽量使用绝对路径，通过python的os模块获取当前文件绝对路径)
os.path.dirname(os.path.abspath(__file__)) 返回的是文件的目录
os.path.abspath(__file__)返回的是.py文件的绝对路径，包含文件名，并且返回path规范化的绝对路径
相对路径
../表示源文件所在目录的上一级目录，../../表示源文件所在目录的上上级目录，以此类推。
同级目录直接文件名可以直接引用
./下一级目录
来自stackoverflow
Both /tmp and /static/uploads/.., are absolute paths. And your code is looking in the / folder instead of looking in your project's folder. You should use the absolute path to point at your folder /path/to/your/project/static/uploads/.. or use a path relative to the code being executed such as ./static/uploads.
You can also use the following snippet to generate the absolute path:
from os.path import join, dirname, realpath
UPLOADS_PATH = join(dirname(realpath(__file__)), 'static/uploads/..')