Bug 1623765 - `mach watch` supports Python 3 r=dmajor

Differential Revision: https://phabricator.services.mozilla.com/D67927

--HG--
extra : moz-landing-system : lando

mach

@@ -82,7 +82,6 @@ py2commands="
     valgrind-test
     visualmetrics
     warnings-list
-    watch
     web-platform-tests
     web-platform-tests-update
     webidl-example

python/mozbuild/mozbuild/faster_daemon.py

@@ -32,7 +32,7 @@ import pywatchman
 
 def print_line(prefix, m, now=None):
     now = now or datetime.datetime.utcnow()
-    print(b'[%s %sZ] %s' % (prefix, now.isoformat(), m))
+    print('[%s %sZ] %s' % (prefix, now.isoformat(), m))
 
 
 def print_copy_result(elapsed, destdir, result, verbose=True):

python/mozbuild/mozbuild/mach_commands.py

@@ -84,7 +84,7 @@ class Watch(MachCommandBase):
 
         self._activate_virtualenv()
         try:
-            self.virtualenv_manager.install_pip_package('pywatchman==1.3.0')
+            self.virtualenv_manager.install_pip_package('pywatchman==1.4.1')
         except Exception:
             print('Could not install pywatchman from pip. See '
                   'https://developer.mozilla.org/docs/Mozilla/Developer_guide/Build_Instructions/Incremental_builds_with_filesystem_watching')  # noqa