Interaction with the operating system

The modules sys and os provide the basic interface to the operating system. The module os creates a portable abstraction layer which is used by high-level modules, like glob, socket, thred, time, fcntl.

Module sys

The module sys provides access to system-specific parameters by the interpreter.

Example argv

   1 #system1.py
   2 import sys
   3 print sys.argv

run system1.py parameter1 parameter2
['system1.py', 'parameter1', 'parameter2']

The script prints the command line arguments that are passed to the script. argv[0] is the script name

A more sophisticated way of evaluating command line arguments is provided by the module optparse

Module os

   1 #!/usr/bin/env python
   2 import os,glob
   3 
   4 filelist=glob.glob('*.pdf')
   5 for f in filelist:
   6     psfilename=f.split('.')[0]+'.ps'
   7     cmd='pdftops '+f+' '+psfilename
   8     print cmd
   9     os.system(cmd)

Input/Output

LehreWiki: SiaProgrammingPythonSystem (last edited 2008-04-21 12:09:59 by anonymous)

-  ⇤ ← Revision 1 as of 2008-04-14 10:59:03 → 
  Size: 206
  Editor: anonymous
  Comment:
+   ← Revision 4 as of 2008-04-15 16:51:39 → ⇥
  Size: 1241
  Editor: anonymous
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
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-#acl AdminGroup:read,write EditorGroup:read All:read
+#acl AdminGroup:read,write
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+SiaProgrammingPython
-Line 6:
+Line 7:
-= I/O =
+<<TableOfContents(2)>>
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+Line 13:
+The modules sys and os provide the basic interface to the operating system. 
The module os creates a portable abstraction layer which is used by high-level modules, like glob, socket, thred, time, fcntl.
-Line 11:
+Line 18:
+The module [[http://docs.python.org/lib/module-sys.html|sys]] provides access to system-specific parameters  
by the interpreter.

=== Example argv ===
{{{#!python
#system1.py
import sys
print sys.argv
}}}

{{{
run system1.py parameter1 parameter2
['system1.py', 'parameter1', 'parameter2']
}}}
The script prints the command line arguments that are passed to the script. argv[0] is the script name

A more sophisticated way of evaluating command line arguments is provided by the module 
[[http://docs.python.org/lib/module-optparse.html|optparse]]
-Line 13:
+Line 38:
+{{{#!python
#!/usr/bin/env python
import os,glob

filelist=glob.glob('*.pdf')
for f in filelist:
    psfilename=f.split('.')[0]+'.ps'
    cmd='pdftops '+f+' '+psfilename
    print cmd
    os.system(cmd)
}}}

= Input/Output =