Initial data commit

Task/File-input-output/Python/file-input-output-3.py

@@ -0,0 +1,20 @@
+import sys
+try:
+    infile = open('input.txt', 'r')
+except IOError:
+    print >> sys.stderr, "Unable to open input.txt for input"
+    sys.exit(1)
+try:
+    outfile = open('output.txt', 'w')
+except IOError:
+    print >> sys.stderr, "Unable to open output.txt for output"
+    sys.exit(1)
+try:  # for finally
+    try: # for I/O
+        for line in infile:
+            outfile.write(line)
+    except IOError, e:
+        print >> sys.stderr, "Some I/O Error occurred (reading from input.txt or writing to output.txt)"
+finally:
+    infile.close()
+    outfile.close()