|   | 1 |  initial version  | 
Use raw strings instead:
common_beginning = r'{\bf To: '
|   | 2 |  No.2 Revision  | 
Use raw strings instead:
common_beginning = r'{\bf To: '
Or use escape sequences correctly:
common_beginning = '{\\bf To: '
(That is, write \\ to get a literal backslash.)
 Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.
 
                
                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.