Clean up additional warnings spam

- Use raw strings (r'') for regexs. Otherwise the escape characters will
  be parsed by python, rather than being passed as part of the regex
  itself.
- Use "==" instead of "is" for checking string equality, rather than
  object equality. This technically works for small integers, because
  they have static object ids, but this is an implementation detail that
  shouldn't be depended on.

extensions/composer/extension.py

@@ -94,7 +94,7 @@ def read_exts_from_path(self, path):
     def pick_php_version(self, requested):
         selected = None
 
-        if requested is None or requested is '':
+        if requested is None or requested == '':
             return self._ctx['PHP_VERSION']
 
         # requested is coming from the composer.json file and is a unicode string type.

extensions/dynatrace/extension.py

@@ -260,7 +260,7 @@ def update_agent_config(self):
 
         # store static config in same kind of data structure (nested dictionary)
         # as we use for the config from we fetched from the API
-        section_regex = re.compile('\[(.*)\]')
+        section_regex = re.compile(r'\[(.*)\]')
         config_section = ""
         config_from_agent = dict()
         _log.debug("Starting to parse OneAgent config...")

extensions/sessions/extension.py

@@ -111,13 +111,13 @@ def _compile(self, install):
         # modify php.ini to contain the right session config
         self.load_config()
         self._php_ini.update_lines(
-            '^session\.name = JSESSIONID$',
+            r'^session\.name = JSESSIONID$',
             'session.name = PHPSESSIONID')
         self._php_ini.update_lines(
-            '^session\.save_handler = files$',
+            r'^session\.save_handler = files$',
             'session.save_handler = %s' % self.service.EXTENSION_NAME)
         self._php_ini.update_lines(
-            '^session\.save_path = "@{TMPDIR}"$',
+            r'^session\.save_path = "@{TMPDIR}"$',
             'session.save_path = "%s"' % self.service.session_save_path())
         self.service.custom_config_php_ini(self._php_ini)
         self._php_ini.save(self._php_ini_path)

tests/test_composer.py

@@ -74,7 +74,7 @@ def test_composer_tool_install(self):
         installer.package.return_value.done.assert_called_once()
         # make sure composer is installed
         installer._installer._install_binary_from_manifest.assert_called_once()
-        assert re.match('/composer/[\d\.]+/composer.phar', installer._installer._install_binary_from_manifest.call_args[0][0]), \
+        assert re.match(r'/composer/[\d\.]+/composer.phar', installer._installer._install_binary_from_manifest.call_args[0][0]), \
             "was %s" % installer._installer._install_binary_from_manifest.call_args[0][0]
 
     def test_composer_tool_install_latest(self):