subprocess module exec 'wmic datafile' command no result and how to fix it?

Question

i can get reply in cmd.exe like this:

comand

wmic datafile where name="C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe" get Version /value

reply

Version=110.0.5481.178

but when i use python's subprocess,it will give me just empty reply

anyone has the same question?how to resolve it?

Answer 1

import subprocess

spath = r"C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe"
cargs = ["wmic", "datafile", "where", "name=\"{0}\"".format(spath), "get", "Version", "/value"]
process = subprocess.check_output(cargs)
print(process.strip().decode())

Answer 2

If you want to get the result from subprocess module, you can try these functions as below.

1. subprocess.check_output

• Run command with arguments and return its output.
• Example:

In [70]: r = subprocess.check_output("ls ~", shell=True)

In [72]: r.decode()
Out[72]: 'Applications\nDesktop\nDocuments\nDownloads\nLibrary\nMovies\nMusic\nPictures\nPostman\nPublic\nSunlogin Files\nfineagent.jar\nget-poetry.py\ngo\nlogfile\npip.conf\npythonlogs\nrequirements.txt\nssh.sh\n'

2. subprocess.getoutput

• Return output (stdout and stderr) of executing cmd in a shell.
• Example:

In [79]: r = subprocess.getoutput("ls ~")

In [80]: r
Out[80]: 'Applications\nDesktop\nDocuments\nDownloads\nLibrary\nMovies\nMusic\nPictures\nPostman\nPublic\nSunlogin Files\nfineagent.jar\nget-poetry.py\ngo\nlogfile\npip.conf\npythonlogs\nrequirements.txt\nssh.sh'

and also subprocess.getstatusoutput, etc.

You have more choice. Refer official website: portal1 | portal2

But the functions metioned above are either legacy functions from the 2.x commands module or old high level api...

---

Now the recommended way to invoke subprocess is to use run() function. For more advanced use cases, the underlying Popen 「It's also a nice choice.」interface can be used directly.

3. subprocess.run

• Run the command described by args. Wait for command to complete, then return a CompletedProcess instance.
• Example:

In [76]: r = subprocess.run("ls ~", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

In [77]: r
Out[77]: CompletedProcess(args='ls ~', returncode=0, stdout=b'Applications\nDesktop\nDocuments\nDownloads\nLibrary\nMovies\nMusic\nPictures\nPostman\nPublic\nSunlogin Files\nfineagent.jar\nget-poetry.py\ngo\nlogfile\npip.conf\npythonlogs\nrequirements.txt\nssh.sh\n', stderr=b'')

In [78]: r.stdout
Out[79]: b'Applications\nDesktop\nDocuments\nDownloads\nLibrary\nMovies\nMusic\nPictures\nPostman\nPublic\nSunlogin Files\nfineagent.jar\nget-poetry.py\ngo\nlogfile\npip.conf\npythonlogs\nrequirements.txt\nssh.sh\n'

Refer to the detailed description: subprocess.run

Hope it helps you.