feat(tests): add test for supporting older python versions

Makefile

@@ -92,6 +92,9 @@ ruststyle_check:
 	@echo [RUSTFMT]
 	@cd core/embed/rust ; cargo fmt -- --check
 
+python_support_check:
+	./tests/test_python_support.py
+
 ## code generation commands:
 
 mocks: ## generate mock python headers from C modules

ci/test.yml

@@ -623,6 +623,13 @@ python test:
     # https://github.com/NixOS/nixpkgs/pull/98915
     - nix-shell --arg fullDeps true --run "unset _PYTHON_SYSCONFIGDATA_NAME && cd python && poetry run tox | ts -s"
 
+python support test:
+  stage: test
+  <<: *gitlab_caching
+  needs: []
+  script:
+    - nix-shell --run "poetry run make python_support_check | ts -s"
+
 
 # Storage
 

docs/ci/jobs.md

@@ -141,7 +141,7 @@ Bitcoin-only version.
 ## TEST stage - [test.yml](../../ci/test.yml)
 All the tests run test cases on the freshly built emulators from the previous `BUILD` stage.
 
-Consists of **34 jobs** below:
+Consists of **35 jobs** below:
 
 ### [core unit test](https://github.com/trezor/trezor-firmware/blob/master/ci/test.yml#L15)
 Python and rust unit tests, checking TT functionality.
@@ -219,11 +219,13 @@ Persistence tests.
 
 ### [python test](https://github.com/trezor/trezor-firmware/blob/master/ci/test.yml#L600)
 
-### [storage test](https://github.com/trezor/trezor-firmware/blob/master/ci/test.yml#L629)
+### [python support test](https://github.com/trezor/trezor-firmware/blob/master/ci/test.yml#L626)
 
-### [core unix memory profiler](https://github.com/trezor/trezor-firmware/blob/master/ci/test.yml#L653)
+### [storage test](https://github.com/trezor/trezor-firmware/blob/master/ci/test.yml#L636)
 
-### [connect test core](https://github.com/trezor/trezor-firmware/blob/master/ci/test.yml#L677)
+### [core unix memory profiler](https://github.com/trezor/trezor-firmware/blob/master/ci/test.yml#L660)
+
+### [connect test core](https://github.com/trezor/trezor-firmware/blob/master/ci/test.yml#L684)
 
 ---
 ## TEST-HW stage - [test-hw.yml](../../ci/test-hw.yml)

tests/test_python_support.py

@@ -0,0 +1,60 @@
+#!/usr/bin/env python3
+"""
+Verifying that all the tools can be run even by older python versions.
+
+Uses `pyright --pythonversion 3.X <path>` output to check for substrings that
+indicate the type-hints in the code are not compatible with this version.
+"""
+
+import os
+import subprocess
+import sys
+from pathlib import Path
+
+HERE = Path(__file__).resolve().parent
+ROOT_DIR = HERE.parent
+
+EXIT_CODE = 0
+
+os.chdir(ROOT_DIR)
+
+versions_to_check = [
+    "3.7",
+    "3.8",
+    "3.9",
+]
+
+dirs_to_check = [
+    "tools",
+    "common",
+    "core/tools",
+]
+
+signs_of_issues = [
+    "is unknown import symbol",  # we need to import some stuff from typing_extensions instead of typing
+    "will generate runtime exception",  # happens when using `dict` or `list` as a type alias
+]
+
+
+def check_directory(path: str, python_version: str) -> None:
+    global EXIT_CODE
+    cmd = (
+        "pyright",
+        "--pythonversion",
+        python_version,
+        path,
+    )
+
+    result = subprocess.run(cmd, stdout=subprocess.PIPE, text=True)
+    for line in result.stdout.splitlines():
+        if any(sign in line for sign in signs_of_issues):
+            print(line)
+            EXIT_CODE = 1
+
+
+for version in versions_to_check:
+    print(f"Checking python version {version}")
+    for dir_to_check in dirs_to_check:
+        check_directory(dir_to_check, version)
+
+sys.exit(EXIT_CODE)