ex18.py

ex17.py

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+from sys import argv
+from os.path import exists
+
+script, from_file, to_file = argv
+
+print "Copying from %s to %s" % (from_file, to_file)
+
+# we could do these two on one line too, how?
+input = open(from_file)
+indata = input.read()
+
+print "The input file is %d bytes long" % len(indata)
+
+print "Does the output file exist? %r" % exists(to_file)
+print "Ready, hit RETURN to continue, CTRL-C to abort."
+raw_input()
+
+output = open(to_file, 'w')
+output.write(indata)
+
+print "Alright, all done."
+
+output.close()

ex18.py

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+# this one is like your scriptss with argv
+
+def print_two(*args):
+    arg1, arg2 = args
+    print "arg1: %r, arg2: %r" % (arg1, arg2)
+
+# of, that *args is actually pointless, we can just do this
+def print_two_again(arg1, arg2):
+    print "arg1: %r, arg2: %r" % (arg1, arg2)
+
+# this just takes one argument
+def print_one(arg1):
+    print "arg1: %r" % arg1
+
+# this one takes no arguments
+def print_none():
+    print "I got nothin'."
+
+
+print_two("Zed","Shaw")
+print_two_again("Zed","Shaw")
+print_one("First!")
+print_none()