python-通过子进程捕获pandoc错误消息

Question

I am writing some Python code that interacts with pandoc via the subprocess module. I am, however, having trouble capturing what pandoc would normally print to the console whenever a command goes wrong. For example, I put this command into Terminal:

pandoc -N  --variable mainfont=Georgia --variable sansfont=Arial --variable monofont="Bitstream Vera Sans Mono" --variable fontsize=12pt --variable version=1.10 README.txt  --latex-engine=xelatex --toc -o README.pdf

And pandoc then spits out this error message:

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!
! fontspec error: "font-not-found"
! 
! The font "Bitstream Vera Sans Mono" cannot be found.
! 
! See the fontspec documentation for further information.
! 
! For immediate help type H .
!...............................................                                                   
l.20 ...apping=tex-ansi]{Bitstream Vera Sans Mono}  
pandoc: Error producing PDF from TeX source

Now, I've tried to capture this same error message within my Python code, but to no avail. My current code looks like this:

cmd = ['pandoc', '-N', '--variable=mainfont:Georgia', '--variable=sansfont:Arial', '--variable=monofont:"Bitstream Vera Sans Mono"', '--variable=fontsize:12pt', '--variable=version:1.10', 'README.txt', '--latex-engine=xelatex', '--toc', '--output=README.pdf']
proc = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
print proc

But this only tells me that the command returned non-zero exit status 43 . It doesn't print the full (actually informative) error message that I get in the console.

What am I missing?

Answer 1

Based on the docs , it looks like something like this should work.

try:
    subprocess.check_output(cmd)
except subprocess.CalledProcessError as e:
    print e.output