python-2.7,subprocess,temporary-files , Use NamedTemporaryFile to read from stdout via subprocess on Linux
Use NamedTemporaryFile to read from stdout via subprocess on Linux
Question:
Tag: python-2.7,subprocess,temporary-files
import subprocess
import tempfile
fd = tempfile.NamedTemporaryFile()
print(fd)
print(fd.name)
p = subprocess.Popen("date", stdout=fd).communicate()
print(p[0])
fd.close()
This returns:
<open file '<fdopen>', mode 'w' at 0x7fc27eb1e810>
/tmp/tmp8kX9C1
None
Instead, I would like it to return something like:
Tue Jun 23 10:23:15 CEST 2015
I tried adding mode="w", as well as delete=False, but can't succeed to make it work.
Answer:
Unless stdout=PIPE; p[0] will always be None in your code.
To get output of a command as a string, you could use check_output():
#!/usr/bin/env python
from subprocess import check_output
result = check_output("date")
check_output() uses stdout=PIPE and .communicate() internally.
To read output from a file, you should call .read() on the file object:
#!/usr/bin/env python
import subprocess
import tempfile
with tempfile.TemporaryFile() as file:
subprocess.check_call("date", stdout=file)
file.seek(0) # sync. with disk
result = file.read()
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