Python 3 compatible syntax (#18374)

* Python 3 compatible syntax

* fix type

.travis.yml

@@ -1,6 +1,8 @@
 language: python
 
-python: "2.7"
+python:
+- "2.7"
+- "3.6"
 
 sudo: false
 

doc/scripts/distro_to_rosinstall.py

@@ -21,11 +21,11 @@ def translate(distro, translate_dir):
 
         path = os.path.join(translate_dir, "%s.rosinstall" % item.name)
         with open(path, 'w+') as f:
-            print "writing to %s" % path
+            print("writing to %s" % path)
             yaml.safe_dump(rosinstall, f, default_flow_style=False)
 
 if __name__ == '__main__':
     if len(sys.argv) != 3:
-        print "Use %s distro install_folder" % sys.argv[0]
+        print("Use %s distro install_folder" % sys.argv[0])
         sys.exit()
     translate(sys.argv[1], sys.argv[2])

scripts/check_rosdistro.py

@@ -31,9 +31,9 @@
 def printc(text, color):
     """Print in color."""
     if sys.stdout.isatty():
-        print "\033["+codeCodes[color]+"m"+text+"\033[0m"
+        print("\033["+codeCodes[color]+"m"+text+"\033[0m")
     else:
-        print text
+        print(text)
 
 def print_test(msg):
     printc(msg, 'yellow')

test/test_url_validity.py

@@ -11,7 +11,10 @@
 import subprocess
 import sys
 import unittest
-from urlparse import urlparse
+try:
+    from urllib.parse import urlparse
+except ImportError:
+    from urlparse import urlparse
 
 import rosdistro
 from scripts import eol_distro_names
@@ -60,11 +63,9 @@ def detect_lines(diffstr):
     """Take a diff string and return a dict of
     files with line numbers changed"""
     resultant_lines = {}
-    # diffstr is already utf-8 encoded
+    # diffstr is already decoded
     io = StringIO(diffstr)
-    # Force utf-8 re: https://github.com/ros/rosdistro/issues/6637
-    encoding = 'utf-8'
-    udiff = unidiff.PatchSet(io, encoding)
+    udiff = unidiff.PatchSet(io)
     for file in udiff:
         target_lines = []
         # if file.path in TARGET_FILES:
@@ -232,7 +233,7 @@ def isolate_yaml_snippets_from_line_numbers(yaml_dict, line_numbers):
 
 def main():
     cmd = ('git diff --unified=0 %s' % DIFF_TARGET).split()
-    diff = subprocess.check_output(cmd)
+    diff = subprocess.check_output(cmd).decode('utf-8')
     # print("output", diff)
 
     diffed_lines = detect_lines(diff)