warning: deprecation warning message - Python 2.7

samcli/cli/command.py

@@ -4,6 +4,7 @@
 
 import logging
 import importlib
+import sys
 import click
 
 logger = logging.getLogger(__name__)
@@ -20,6 +21,13 @@
     "samcli.commands.publish"
 }
 
+DEPRECATION_NOTICE = (
+    "Warning : AWS SAM CLI will no longer support "
+    "installations on Python 2.7 starting on October 1st, 2019."
+    " Install AWS SAM CLI via https://docs.aws.amazon.com/serverless-application-model/"
+    "latest/developerguide/serverless-sam-cli-install.html for continued support with new versions. \n"
+)
+
 
 class BaseCommand(click.MultiCommand):
     """
@@ -58,6 +66,9 @@ def __init__(self, cmd_packages=None, *args, **kwargs):
         self._commands = {}
         self._commands = BaseCommand._set_commands(cmd_packages)
 
+        if sys.version_info.major == 2:
+            click.secho(DEPRECATION_NOTICE, fg="yellow", err=True)
+
     @staticmethod
     def _set_commands(package_names):
         """

tests/integration/deprecation/test_deprecation_warning.py

@@ -0,0 +1,31 @@
+import os
+import subprocess
+import sys
+
+from unittest import TestCase
+
+from samcli.cli.command import DEPRECATION_NOTICE
+
+
+class TestPy2DeprecationWarning(TestCase):
+
+    def base_command(self):
+        command = "sam"
+        if os.getenv("SAM_CLI_DEV"):
+            command = "samdev"
+
+        return command
+
+    def run_cmd(self):
+        # Checking with base command to see if warning is present if running in python2
+        cmd_list = [self.base_command()]
+        process = subprocess.Popen(cmd_list, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        return process
+
+    def test_print_deprecation_warning_if_py2(self):
+        process = self.run_cmd()
+        (stdoutdata, stderrdata) = process.communicate()
+
+        # Deprecation notice should be part of the command output if running in python 2
+        if sys.version_info.major == 2:
+            self.assertIn(DEPRECATION_NOTICE, stderrdata.decode())