Use sys.stdin instead of the literal '/dev/stdin' for cross platform compatibility. Changed the shebang line so that gpx2svg will also work on Mac.

gpx2svg

@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
 
 #   Copyright (c) 2012-2014 Tobias Leupold <tobias.leupold@web.de>
 #
@@ -23,10 +23,14 @@ import argparse
 import sys
 import math
 from xml.dom.minidom import parse as parseXml
+from os.path import abspath
 
 def parseGpx(gpxFile):
     """Get the latitude and longitude data of all track segments in a GPX file"""
 
+    if gpxFile == '/dev/stdin':
+        gpxFile = sys.stdin
+
     # Get the XML information
     try:
         gpx = parseXml(gpxFile)
@@ -315,6 +319,14 @@ def main():
     if cmdArgs.o == '-':
         cmdArgs.o = '/dev/stdout'
 
+    # Check if a given input or output file name is a relative representation of STDIN or STDOUT
+    if cmdArgs.i != '/dev/stdin':
+        if abspath(cmdArgs.i) == '/dev/stdin':
+            cmdArgs.i = '/dev/stdin'
+    if cmdArgs.o != '/dev/stdout':
+        if abspath(cmdArgs.o) == '/dev/stdout':
+            cmdArgs.o = '/dev/stdout'
+
     # Get the latitude and longitude data from the given GPX file or STDIN
     gpsData = parseGpx(cmdArgs.i)