For me, these warnings are continuing to arise almost daily. See two recent examples below. In both cases, the code previously had always worked without complaint. ----- Example from yesterday's class ---- ''' How old-style formatting works with positional placeholders print('The answer is %d today, but was %d yesterday' % (new, old)) \--------------------o \------------------------------------o ''' SyntaxWarning: invalid escape sequence \- ----- Example from today's class ---- # Cut and pasted from: # https://en.wikipedia.org/wiki/VCard#vCard_2.1 vcard = ''' BEGIN:VCARD VERSION:2.1 N:Gump;Forrest;;Mr. FN:Forrest Gump ORG:Bubba Gump Shrimp Co. TITLE:Shrimp Man PHOTO;GIF:http://www.example.com/dir_photos/my_photo.gif TEL;WORK;VOICE:(111) 555-1212 TEL;HOME;VOICE:(404) 555-1212 ADR;WORK;PREF:;;100 Waters Edge;Baytown;LA;30314;United States of America LABEL;WORK;PREF;ENCODING=QUOTED-PRINTABLE;CHARSET=UTF-8:100 Waters Edge=0D= =0ABaytown\, LA 30314=0D=0AUnited States of America ADR;HOME:;;42 Plantation St.;Baytown;LA;30314;United States of America LABEL;HOME;ENCODING=QUOTED-PRINTABLE;CHARSET=UTF-8:42 Plantation St.=0D=0A= Baytown, LA 30314=0D=0AUnited States of America EMAIL:forrestgump@example.com REV:20080424T195243Z END:VCARD ''' SyntaxWarning: invalid escape sequence \,