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server:diskfree-statvfs-df sander$ python3 diskfree_statvfs_df.py /
dir is /
df is always right, so: Disk size, and free (in MB): (953049, 521921)
python's os.statvfs() says (953050, 521921)
clib statfs32 says (953050, 521921)
Now the real determination
(953050, 521921)

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def linux_disk_free_clib_statfs(directory):
	class statfs(Structure):
	    _fields_ = [
                ("f_type",       c_int64),
                ("f_bsize",      c_int64),
                ("f_blocks",     c_ulong),
                ("f_bfree",      c_ulong),
                ("f_bavail",     c_ulong),
                ("f_files",      c_ulonglong),
                ("f_ffree",      c_ulonglong),
                ("f_frsize",     c_ulong),
		       ]

	kern = CDLL(util.find_library('c'), use_errno=True)
	root_volume = create_string_buffer(str.encode(directory))
	fs_info = statfs()
	result = kern.statfs(root_volume, byref(fs_info)) # you have to call this to get fs_info filled out
	disk_size_MB = fs_info.f_blocks * fs_info.f_bsize / 1024**2
	free_size_MB = fs_info.f_bavail  * fs_info.f_bsize / 1024**2
	return disk_size_MB, free_size_MB

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dir is /media/psf/Big_One/
df is always right, so: Disk size, and free (in MB): (38149816, 35697196)
python's os.statvfs() says (38149816, 35697195)
clib statfs32 says (8158310.44921875, 18201800055525.207)
clib linux statfs says (38149815.9609375, 35697195.234375)

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sander@brixit:~$ df -m /
Filesystem     1M-blocks  Used Available Use% Mounted on
/dev/sdb2         111659 43070     62875  41% /
sander@brixit:~$

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sander@brixit:~$ python3 diskfree_linux.py /
/
(111658.16015625, 62874.61328125)
Segmentation fault (core dumped)
sander@brixit:~$

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#!/usr/bin/env python3
import os, sys

def disk_free_os_df(directory):
        # On any any POSIX with any disksize, "df" is always right, but heavy as it needs a process
        directory = '"' + directory + '"'
        cmd = "df -m " + directory  # show in MB
        for thisline in os.popen(cmd).readlines():
                if not thisline.startswith("Filesystem"):
                        _, df_blocks_MB, _, df_available_MB = thisline.split()[:4]
                        df_blocks_MB = int(df_blocks_MB) # blocks of 1MB, so blocks is MBs
                        df_available_MB = int(df_available_MB)
                        break # line found, so we're done
        return df_blocks_MB, df_available_MB

if (len(sys.argv) < 2):
        print("pass a directory")
        exit()
print("checking diskspace for ",sys.argv[1])
df = disk_free_os_df(sys.argv[1])
print("df free",df[1])
s = os.statvfs(sys.argv[1])
avail = s.f_bavail * s.f_frsize / 1024**2
print("statvfs free",avail)

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checking diskspace for  /Volumes/Big_One/
df free 35649357
statvfs free 2094925.87109375