Question

At the beginning of a python script, there are some import statements. Could someone explain what they imply?

import getopt  
import os  
import re   
import string  
import sys  
import getpass  
import urllib  
import subprocess

Answer 1

The import statements are similar (but different) to the #include statements in C: they allow you to use functions defined elsewhere (either in a standard module, or your own).

For example, module sys allows you to do this:

import sys
# ... somewhere down in the file
sys.exit(0)

Which would terminate your program. Note that you did not have to write any code for the exit() function, but it is defined within the standard sys module that ships with the interpreter.

Any Python tutorial should explain this. For example, this.