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windows
>>> import subprocess
>>> p=subprocess.Popen(["powershell", 'gwmi -query "Select * from Win32_DiskPartition WHERE Index = 0" | Select-Object DiskIndex, @{Name="GPT";Expression={$_.Type.StartsWith("GPT")}}'], stdout=subprocess.PIPE)
>>>
>>> print p.stdout.read()
DiskIndex GPT
--------- ---
0 False
>>>
linux
[root@pic2 ~]# fdisk -l
Disk /dev/vda: 32.2 GB, 32212254720 bytes, 62914560 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000a1f93
>>> class GPT():
pass
>>> a=GPT()
>>> isinstance(a, GPT)
True
>>>