chore: drop mention of Python 2.7 from templates (#1481)

Source-Link: https://github.com/googleapis/synthtool/commit/facee4cc1ea096cd8bcc008bb85929daa7c414c0
Post-Processor: gcr.io/repo-automation-bots/owlbot-python:latest@sha256:9743664022bd63a8084be67f144898314c7ca12f0a03e422ac17c733c129d803
diff --git a/.github/.OwlBot.lock.yaml b/.github/.OwlBot.lock.yaml
index 9ee60f7..a9fcd07 100644
--- a/.github/.OwlBot.lock.yaml
+++ b/.github/.OwlBot.lock.yaml
@@ -1,3 +1,3 @@
 docker:
   image: gcr.io/repo-automation-bots/owlbot-python:latest
-  digest: sha256:aea14a583128771ae8aefa364e1652f3c56070168ef31beb203534222d842b8b
+  digest: sha256:9743664022bd63a8084be67f144898314c7ca12f0a03e422ac17c733c129d803
diff --git a/samples/compute/noxfile.py b/samples/compute/noxfile.py
index 6a8ccda..e73436a 100644
--- a/samples/compute/noxfile.py
+++ b/samples/compute/noxfile.py
@@ -39,7 +39,7 @@
 
 TEST_CONFIG = {
     # You can opt out from the test for specific Python versions.
-    'ignored_versions': ["2.7"],
+    'ignored_versions': [],
 
     # Old samples are opted out of enforcing Python type hints
     # All new samples should feature them
@@ -88,15 +88,15 @@
 
 
 # DO NOT EDIT - automatically generated.
-# All versions used to tested samples.
-ALL_VERSIONS = ["2.7", "3.6", "3.7", "3.8", "3.9"]
+# All versions used to test samples.
+ALL_VERSIONS = ["3.6", "3.7", "3.8", "3.9"]
 
 # Any default versions that should be ignored.
 IGNORED_VERSIONS = TEST_CONFIG['ignored_versions']
 
 TESTED_VERSIONS = sorted([v for v in ALL_VERSIONS if v not in IGNORED_VERSIONS])
 
-INSTALL_LIBRARY_FROM_SOURCE = bool(os.environ.get("INSTALL_LIBRARY_FROM_SOURCE", False))
+INSTALL_LIBRARY_FROM_SOURCE = os.environ.get("INSTALL_LIBRARY_FROM_SOURCE", False) in ("True", "true")
 #
 # Style Checks
 #
diff --git a/scripts/readme-gen/templates/install_deps.tmpl.rst b/scripts/readme-gen/templates/install_deps.tmpl.rst
index a0406db..275d649 100644
--- a/scripts/readme-gen/templates/install_deps.tmpl.rst
+++ b/scripts/readme-gen/templates/install_deps.tmpl.rst
@@ -12,7 +12,7 @@
    .. _Python Development Environment Setup Guide:
        https://cloud.google.com/python/setup
 
-#. Create a virtualenv. Samples are compatible with Python 2.7 and 3.4+.
+#. Create a virtualenv. Samples are compatible with Python 3.6+.
 
     .. code-block:: bash