You can also use:

curl https://wyz.fr/ -Fpython=@hello.py

(attribute name is used for syntax highlighting, and shortcuts like "py" are allowed, see Language dropdown for language list.)

You may even use a bash function:

wyz()
{
    curl https://wyz.fr/ -F"${1##*.}=@$1"
}

Like this:

wyz FILE_TO_UPLOAD