Hi all again . didnt know whether to put this in linux forum or here ... anyway.. i am trying to execute a sequence of bash commands from python .. but it doesnt seem to work :
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#!/usr/bin/python
import os
os.system("myfile=/home/pythonprac/commonwords")
os.system("echo $myfile")
this is giving a blank output whereas it is supposed to display /home/pythonprac/commonwords
I believe that once the first os.system call ends any environment variables you may have created get cleaned up. Another solution would be to instead of executing individual commands write those commands to some temporary batch file. Then execute only the file. HTH
Hi all again . didnt know whether to put this in linux forum or here ... anyway.. i am trying to execute a sequence of bash commands from python .. but it doesnt seem to work :
Expand|Select|Wrap|Line Numbers
#!/usr/bin/python
import os
os.system("myfile=/home/pythonprac/commonwords")
os.system("echo $myfile")
this is giving a blank output whereas it is supposed to display /home/pythonprac/commonwords
any idea where i am going wrong ?
thanks
Its best to use the 'popen' method ....
example of looking at whats in a text file on your system:
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from os import popen
file = <some_file_on_your_system>
cmd = ('cat %s' % file)
ff = popen(cmd)
ff.readlines()
Hope this helps .... write back if you need further input
you don't have to call bash commands for what you are doing, reading a file?
use Python's own methods. this will ensure portability with your code
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myfile="/home/myfile"
for lines in open(myfile): # equivalent of unix cat (or other tools for file reading)
print lines
if you want to use ls, use Python's os.listdir, glob.glob(), etc
if you want to cd, use os.chdir() etc
Look at the os module (as well as sys) for such things.
you don't have to call bash commands for what you are doing, reading a file?
use Python's own methods. this will ensure portability with your code
Expand|Select|Wrap|Line Numbers
myfile="/home/myfile"
for lines in open(myfile): # equivalent of unix cat (or other tools for file reading)
print lines
if you want to use ls, use Python's os.listdir, glob.glob(), etc
if you want to cd, use os.chdir() etc
Look at the os module (as well as sys) for such things.
thanks a ton everyone . .. actually i was trying notjust to read a file but mail the contents of the file to any email address using the mail comamnd of bash . ... because for some reason SMTPlib was not working . anyhow ... . problem solved :-)
thanks a ton everyone . .. actually i was trying notjust to read a file but mail the contents of the file to any email address using the mail comamnd of bash . ... because for some reason SMTPlib was not working . anyhow ... . problem solved :-)
Would you mind posting your solution .... just for completeness ...
