Use Python 3 print function in build scripts

bessctl/cli.py

@@ -370,7 +370,7 @@ def print_banner(self):
 
     def process_one_line(self):
         if self.interactive:
-            try:    # Hack for Python 2/3 compatibi
+            try:    # Hack for Python 2/3 compatibility
                 input = raw_input
             except NameError:
                 pass

build.py

@@ -111,22 +111,23 @@ def check_c_lib(lib):
 
 def required(header_file, lib_name, compiler):
     if not check_header(header_file, compiler):
-        print >> sys.stderr, 'Error - #include <%s> failed. ' \
-            'Did you install "%s" package?' % (header_file, lib_name)
+        print('Error - #include <%s> failed. '
+              'Did you install "%s" package?'
+              % (header_file, lib_name), file=sys.stderr)
         sys.exit(1)
 
 
 def check_essential():
     if not cmd_success('gcc -v'):
-        print >> sys.stderr, 'Error - "gcc" is not available'
+        print('Error - "gcc" is not available', file=sys.stderr)
         sys.exit(1)
 
     if not cmd_success('g++ -v'):
-        print >> sys.stderr, 'Error - "g++" is not available'
+        print('Error - "g++" is not available', file=sys.stderr)
         sys.exit(1)
 
     if not cmd_success('make -v'):
-        print >> sys.stderr, 'Error - "make" is not available'
+        print('Error - "make" is not available', file=sys.stderr)
         sys.exit(1)
 
     required('pcap/pcap.h', 'libpcap-dev', 'gcc')

container_build.py

@@ -18,7 +18,8 @@ def run_cmd(cmd):
     proc.communicate()
 
     if proc.returncode:
-        print >> sys.stderr, 'Error has occured running host command: %s' % cmd
+        print('Error has occured running host command: %s' % cmd,
+              file=sys.stderr)
         sys.exit(proc.returncode)
 
 
@@ -48,7 +49,7 @@ def build_kmod():
     try:
         run_docker_cmd('%s kmod' % BUILD_SCRIPT)
     except:
-        print >> sys.stderr, '*** module build has failed.'
+        print('*** module build has failed.', file=sys.stderr)
 
 
 def build_kmod_buildtest():
@@ -73,10 +74,9 @@ def do_dist_clean():
 
 
 def print_usage():
-    print >> sys.stderr, \
-        'Usage: %s ' \
-        '[all|bess|kmod|kmod_buildtest|clean|dist_clean|shell||help]' % \
-        sys.argv[0]
+    print('Usage: %s '
+          '[all|bess|kmod|kmod_buildtest|clean|dist_clean|shell||help]'
+          % sys.argv[0], file=sys.stderr)
 
 
 def main():
@@ -104,7 +104,8 @@ def main():
             print_usage()
             sys.exit(0)
         else:
-            print >> sys.stderr, 'Error - unknown command "%s".' % sys.argv[1]
+            print('Error - unknown command "%s".' % sys.argv[1],
+                  file=sys.stderr)
             print_usage()
             sys.exit(2)
     else: