Question

I have a program on my machine which runs in my terminal window, and returns lists of info. For example:

t000930_152536.SFTC   1369.000
t031109_124140.SFTC   1369.000
t140207_071131.SFTC   3094.000
t190222_011122.SFTC   1369.000
t100423_011232.SFTC   1369.000
t190423_021543.SFTC   1369.000
t190714_205113.SFTC   3094.000
t110115_085319.SFTC   3094.000

All I want to do is to grab this info with Python – whether that be to write it into a file, or make it a list..

Here was my naive attempt:

#!usr/bin/python
import os

os.chdir('./P574/J0998-1034')

f = open('1400list.txt','w')
os.system('vap -c freq *.SFTC') # this tells my other programme to create its list
f.close

But the file created remains empty. Would love some help on this simple issue please!

Answer 1

Try normal file redirection.
Assuming, vap prints its information on stdout, this approach should work for you:

#!usr/bin/python
import os

os.chdir('./P574/J0998-1034')
os.system('vap -c freq *.SFTC > 1400list.txt')