SyntaxWarning: invalid escape sequence (#319)

* Fix Python 3.12 SyntaxWarnings by converting regex strings to raw strings in proj.py

* Update for SyntaxWarning: invalid escape sequence in vplot2gif.py

* Update vplot2png.py for SyntaxWarning: invalid escape sequence

Author: nahkbce

pens/scripts/vplot2gif.py

@@ -17,6 +17,7 @@
 ##   along with this program; if not, write to the Free Software
 ##   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
+# Python 3.12 Compatibility: Fixed regex SyntaxWarning by using raw strings (r'') for regex patterns
 # Modified from the original C-shell version by Joe Dellinger
 
 import sys, os, time, string, re, shutil
@@ -39,7 +40,8 @@ def convert(infile,outfile,args=''):
     stat = lines[0].split()
 
     # find the number of frames
-    retot = re.compile('Total\s+(\d+)')
+    # Fixed: Use raw string for regex to avoid Python 3.12 SyntaxWarning: invalid escape sequence '\s'
+    retot = re.compile(r'Total\s+(\d+)')
     match = retot.search(lines[-1])
     if match:
         frames = int(match.group(1))

pens/scripts/vplot2png.py

@@ -14,6 +14,8 @@
 ##   You should have received a copy of the GNU General Public License
 ##   along with this program; if not, write to the Free Software
 ##   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+# Python 3.12 Compatibility: Fixed regex SyntaxWarning by using raw strings (r'') for regex patterns
 import tempfile, os, sys, re
 import rsf.vplot2eps
 
@@ -52,7 +54,8 @@ def convert(vpl,png,**kw):
         vpl = sys.argv.pop()
     else:
         vpl = png
-        png = re.sub('\.[^\.]+$','.png',vpl)
+        # Fixed: Use raw string for regex to avoid Python 3.12 SyntaxWarning: invalid escape sequence '\.'
+        png = re.sub(r'\.[^\.]+$','.png',vpl)
 
 
     if sys.argv: