python_examples: Reformatted, self-checking, executable

* Moved body of each python example to main.  This allows for basic
      load module testing for CI
    * General cleanup of python modules (crlf/tabs/prints/etc)
    * Chmod'ed to 755 to allow running examples without specifying the
      python interpreter
    * Added ctest for loading python2/3 modules
    * Added jniclasscode pragma for java swig interface files.
    * Updated check_examplenames.py module to check all languages vs. a
      cxx example name
    * Added tests for checking python module and test loading
    * Added 'make test' to travis-ci run (run ctests)
    * Print a more meaningful message when not building cxx docs into
      python modules
    * Updated check_clean.py to only check java wrapper files
    * ENABLED ctests for UPM
    * Deleted using_carrays.py python example - this is covered by other
      examples

Signed-off-by: Noel Eck <noel.eck@intel.com>

examples/python/urm37.py

@@ -24,27 +24,31 @@
 import time, sys, signal, atexit
 import pyupm_urm37 as sensorObj
 
-# Instantiate a URM37 sensor on analog pin A0, reset pin on D2,
-# trigger pin on D3 with an analog reference voltage of 5.0
-sensor = sensorObj.URM37(0, 2, 3, 5.0)
+def main():
+    # Instantiate a URM37 sensor on analog pin A0, reset pin on D2,
+    # trigger pin on D3 with an analog reference voltage of 5.0
+    sensor = sensorObj.URM37(0, 2, 3, 5.0)
 
-## Exit handlers ##
-# This function stops python from printing a stacktrace when you hit control-C
-def SIGINTHandler(signum, frame):
-	raise SystemExit
+    ## Exit handlers ##
+    # This function stops python from printing a stacktrace when you hit control-C
+    def SIGINTHandler(signum, frame):
+        raise SystemExit
 
-# This function lets you run code on exit
-def exitHandler():
-	print "Exiting"
-	sys.exit(0)
+    # This function lets you run code on exit
+    def exitHandler():
+        print "Exiting"
+        sys.exit(0)
 
-# Register exit handlers
-atexit.register(exitHandler)
-signal.signal(signal.SIGINT, SIGINTHandler)
+    # Register exit handlers
+    atexit.register(exitHandler)
+    signal.signal(signal.SIGINT, SIGINTHandler)
 
-# Every half a second, sample the URM37 and output the measured
-# distance in cm.
+    # Every half a second, sample the URM37 and output the measured
+    # distance in cm.
 
-while (1):
+    while (1):
         print "Detected distance (cm):", sensor.getDistance()
-	time.sleep(.5)
+        time.sleep(.5)
+
+if __name__ == '__main__':
+    main()