Use override from typing_extensions

Instead of a having a custom implementation, use the `override` implementation
from the `typing_extensions` module which properly handles Python versions
before 3.12 which don't yet include support for `typing.override`.

Add latest `typing-extensions` to `requirements.txt`.

Instead of using `/usr/bin/python` runline from each Python file, use `python`
or `python3` runner which will pick up the earliest appearing Python binary
which we also previously used when we installed `typing-extensions` module via
`python -m pip install`. On GitHub Actions, this is not `/usr/bin/python`, so if
we install using the default Python, then `/usr/bin/python` will complain of a
missing package.

This only appears to fail on Ubuntu 22.04, but was still annoying to track down.

.github/workflows/main.yml

@@ -49,6 +49,11 @@ jobs:
           python-version: ${{ matrix.python }}
           cache: 'pip'
 
+      - name: Install general Python deps
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install -r requirements.txt
+
       - name: Run tests
         run: make test VERBOSE=1
 

csv2txf_test.sh

@@ -24,7 +24,7 @@ fi
 declare -i num_failures=0
 
 # macOS 12+ doesn't provide /usr/bin/python, but provides /usr/bin/python3
-PYTHON=""
+PYTHON="python"
 if ! [[ -f "/usr/bin/python" ]] && [[ -f "/usr/bin/python3" ]]; then
   PYTHON="python3"
 fi

interactive_brokers.py

@@ -26,7 +26,7 @@
 from typing import Optional
 
 from broker import Broker
-from decorators import override
+from typing_extensions import override
 import utils
 
 

requirements.txt

@@ -1,8 +1 @@
-# We don't need any content here, but the absence of this file breaks
-# actions/setup-python in GitHub Actions, e.g.,
-#
-#   https://github.com/mbrukman/csv2txf/actions/runs/10437183622/job/28903088310?pr=29
-#
-#   > Error: No file in /Users/runner/work/csv2txf/csv2txf matched to
-#   > [**/requirements.txt or **/pyproject.toml], make sure you have checked out
-#   > the target repository
+typing-extensions ~= 4.12.2

run_all_tests.sh

@@ -17,7 +17,7 @@
 declare -i success=0
 
 # macOS 12+ doesn't provide /usr/bin/python, but provides /usr/bin/python3
-PYTHON=""
+PYTHON="python"
 if ! [[ -f "/usr/bin/python" ]] && [[ -f "/usr/bin/python3" ]]; then
   PYTHON="python3"
 fi

tdameritrade.py

@@ -32,7 +32,7 @@
 from typing import Optional
 
 from broker import Broker
-from decorators import override
+from typing_extensions import override
 import utils
 
 

vanguard.py

@@ -30,7 +30,7 @@
 from typing import Optional
 
 from broker import Broker
-from decorators import override
+from typing_extensions import override
 import utils