added VENV_STATE to Makefile for forcing venv rebuilds

Makefile

@@ -176,7 +176,7 @@ dummymodules-clean: env
 
 # Build the project's Python virtual environment. This should happen
 # automatically as a dependency of the env target.
-venv: .venv/efro_venv_complete
+venv: .venv/.efro_venv_complete
 
 # Update pip requirements to latest versions.
 venv-upgrade: env
@@ -1221,10 +1221,10 @@ TOOL_CFG_INST = $(PCOMMAND) tool_config_install
 
 # Anything that affects tool-config generation.
 TOOL_CFG_SRC = tools/efrotools/toolconfig.py config/projectconfig.json \
- .venv/efro_venv_complete tools/pcommand
+ .venv/.efro_venv_complete tools/pcommand
 
 # Anything that should trigger an environment-check when changed.
-ENV_SRC = tools/batools/build.py .venv/efro_venv_complete tools/pcommand
+ENV_SRC = tools/batools/build.py .venv/.efro_venv_complete tools/pcommand
 
 # Generate a pcommand script hard-coded to use our virtual environment.
 # This is a prereq dependency so should not itself depend on env.
@@ -1273,21 +1273,28 @@ SKIP_ENV_CHECKS ?= 0
 
 VENV_PYTHON ?= python3.12
 
-# Rebuild our virtual environment whenever reqs or Python version changes.
-# This is a prereq dependency so should not itself depend on env. Note that we
-# rely on pcommand but can't use it in here until the end when the venv is up.
-# Also note that we try to update existing venvs when possible, but when
-# Python version changes we blow it away and start over to be safe.
-.venv/efro_venv_complete: tools/pcommand config/requirements.txt \
+# Increment this to force all downstream venvs to fully rebuild. Useful after
+# removing requirements since upgrading in place will never uninstall stuff.
+VENV_STATE = 0
+
+# Rebuild our virtual environment whenever reqs, Python version, or explicit
+# state number changes. This is a dependency of env so it should not itself
+# depend on env. Note that we list pcommand as a requirement but can't use it
+# in here until the end when the venv is up. Also note that we try to update
+# venvs in place when possible, but when Python version or venv-state changes
+# we blow it away and start over to be safe.
+.venv/.efro_venv_complete: tools/pcommand config/requirements.txt \
 tools/efrotools/pyver.py
 	@[ -f .venv/bin/$(VENV_PYTHON) ] \
+ && [ -f .venv/.efro_venv_state_$(VENV_STATE) ] \
  && echo Updating existing $(VENV_PYTHON) virtual environment in \'.venv\'... \
  || (echo Creating new $(VENV_PYTHON) virtual environment in \'.venv\'... \
  && rm -rf .venv)
 	$(VENV_PYTHON) -m venv .venv
 	.venv/bin/pip install --upgrade pip
 	.venv/bin/pip install -r config/requirements.txt
-	touch .venv/efro_venv_complete # Done last to enforce fully-built venvs.
+	touch .venv/.efro_venv_state_$(VENV_STATE) \
+ .venv/.efro_venv_complete # Done last to enforce fully-built venvs.
 	@$(PCOMMAND) echo \
  GRN Project virtual environment for BLD $(VENV_PYTHON) RST GRN \
  at BLD .venv RST GRN is ready to use.

config/projectconfig.json

@@ -31,7 +31,6 @@
     "astroid",
     "pylint.lint",
     "pytest",
-    "pytz",
     "yaml",
     "requests",
     "typing_extensions",

config/requirements.txt

@@ -1,4 +1,3 @@
-ansiwrap==0.8.4
 cpplint==1.6.1
 dmgbuild==1.6.1
 filelock==3.13.4
@@ -13,13 +12,11 @@ pytest==8.1.1
 python-daemon==3.0.1
 python-lsp-black==2.0.0
 python-lsp-server==1.11.0
-pytz==2024.1
 PyYAML==6.0.1
 requests==2.31.0
 Sphinx==7.3.7
 types-certifi==2021.10.8.3
 types-filelock==3.2.7
-types-pytz==2024.1.0.20240417
 types-PyYAML==6.0.12.20240311
 types-requests==2.31.0.20240406
 typing_extensions==4.11.0

tools/efro/util.py

@@ -12,16 +12,6 @@ import functools
 from enum import Enum
 from typing import TYPE_CHECKING, cast, TypeVar, Generic
 
-_pytz_utc: Any
-
-# We don't *require* pytz, but we want to support it for tzinfos if available.
-try:
-    import pytz
-
-    _pytz_utc = pytz.utc
-except ModuleNotFoundError:
-    _pytz_utc = None  # pylint: disable=invalid-name
-
 if TYPE_CHECKING:
     import asyncio
     from efro.call import Call as Call  # 'as Call' so we re-export.
@@ -112,12 +102,9 @@ def enum_by_value(cls: type[EnumT], value: Any) -> EnumT:
 
 def check_utc(value: datetime.datetime) -> None:
     """Ensure a datetime value is timezone-aware utc."""
-    if value.tzinfo is not datetime.timezone.utc and (
-        _pytz_utc is None or value.tzinfo is not _pytz_utc
-    ):
+    if value.tzinfo is not datetime.UTC:
         raise ValueError(
-            'datetime value does not have timezone set as'
-            ' datetime.timezone.utc'
+            'datetime value does not have timezone set as datetime.UTC'
         )