Cross-platform space remaining on volume using python

by 
import ctypes
import os
import platform
import sys

def get_free_space_mb(dirname):
    """Return folder/drive free space (in megabytes)."""
    if platform.system() == 'Windows':
        free_bytes = ctypes.c_ulonglong(0)
        ctypes.windll.kernel32.GetDiskFreeSpaceExW(ctypes.c_wchar_p(dirname), None, None, ctypes.pointer(free_bytes))
        return free_bytes.value / 1024 / 1024
    else:
        st = os.statvfs(dirname)
        return st.f_bavail * st.f_frsize / 1024 / 1024

Note that you must pass a directory name for GetDiskFreeSpaceEx() to work
(statvfs() works on both files and directories). You can get a directory name
from a file with os.path.dirname().

Also see the documentation for os.statvfs() and GetDiskFreeSpaceEx.

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