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Python: SYS module

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  1. # The sys module provides an interface to access the environment of the Python interpreter.
  2. # The following examples illustrate some of the most common uses of the sys module.
  3.  
  4. # The argv attribute of the sys module is a list. The first item in the argv list is the 
  5. # path to the module; the rest of the list is made up of arguments that were passed to the
  6. # module at the beginning of execution. The sample code shows how to use the argv list to 
  7. # access command-line parameters passed to a Python module:
  8.  
  9. >>>print sys.argv
  10. ['C:\\books\\python\\CH1\\code\\print_it.py',
  11. 'text']
  12. >>>print sys.argv[1]
  13. text
  14.  
  15. # The stdin attribute of the sys module is a file object that gets created at the start of
  16. # code execution. In the following sample code, text is read from stdin (in this case, the
  17. # keyboard, which is the default) using the readline() function:
  18.  
  19. >>>text = sys.stdin.readline()
  20. >>>print text
  21. Input Text
  22.  
  23. # The sys module also has the stdout and stderr attributes that point to files used for
  24. # standard output and standard error output. These files default to writing to the screen.
  25. # The following sample code shows how to redirect the standard output and standard error 
  26. # messages to a file rather than to the screen:
  27.  
  28. >>>sOUT = sys.stdout
  29. >>>sERR = sys.stderr
  30. >>>sys.stdout = open("ouput.txt", "w")
  31. >>>sys.stderr = sys.stdout
  32. >>>sys.stdout = sOUT
  33. >>>sys.stderr = sERR

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