calculate percentage from variables

[outspoken]

This is a pretty basic script, just wanting to grab some values from commandline and insert them into variables take those and calculate percentage.

import os
files = os.system('ls ../files/ | wc -l')
matches = os.system('wc -l ../text/burn.roto_02 | awk \'{print $1}\'')
percent=(files/matches)*100
print percent

I'll also need to tack a '.0' at the end of those variables so it returns a true value. example:

percent=(files.0/matches.0)*100

Running the below I get my expected value, but it is the variable which hangs things up for me.

python -c "percent=(20.0/100.0)*100;print percent"
20.0

Thanks!

 

[JustinEzequiel]

try

percent=(1.0*files/matches)*100

 

[outspoken]

that does work, thanks.

i'm having another problem now, trying to get the right values from my os.system commands. they just return the 0 value instead of the actual numbers from the shell script. i'm looking at 'popen' and 'argv' to see if these will help in grabbing the stdout from those commands.

 

[outspoken]

ok, it is working now..

#!/usr/bin/python
import os
files = float(os.popen('ls ../files/ | wc -l').read().split()[0])
matches = float(os.popen('wc -l ../text/burn.roto_02').read().split()[0])
percent_matches=float(1.0*files/matches)*100
print percent_matches