indicate pymssql as only binary

a new release of pymssql is out and they don't have wheel files,
so builds are failing.

we don't have deps set up to build pymssql, so hack into tox.ini
to force pip to only use a wheel.

additionally, add "py3" as a recognized target where we are referring
to specific py3 versions.

Change-Id: Id876fe902d4d7cae964a241c9fd7b678645b0ea5

tox.ini

@@ -18,7 +18,7 @@ extras=
      sqlite_file: aiosqlite
      sqlite_file: sqlcipher; python_version < '3.10'
      postgresql: postgresql
-     py3{,7,8,9,10,11}-postgresql: postgresql_asyncpg
+     py{3,37,38,39,310,311}-postgresql: postgresql_asyncpg
      postgresql: postgresql_pg8000
      postgresql: postgresql_psycopg
 
@@ -28,9 +28,14 @@ extras=
 
      oracle: oracle
      oracle: oracle_oracledb
-     py3{,7,8,9,10,11}-mssql: mssql
-     py3{,7,8,9,10,11}-mssql: mssql_pymssql
+     py{3,37,38,39,310,311}-mssql: mssql
+     py{3,37,38,39,310,311}-mssql: mssql_pymssql
 
+install_command=
+     # TODO: I can find no way to get pip / tox / anyone to have this
+     # --only-binary option local to the pymssql install, rather than global
+     # as it is here.
+     python -I -m pip install --only-binary=pymssql {opts} {packages}
 
 deps=
      pytest>=7.0.0rc1,<8
@@ -101,32 +106,30 @@ setenv=
 
     oracle: WORKERS={env:TOX_WORKERS:-n2  --max-worker-restart=5}
     oracle: ORACLE={env:TOX_ORACLE:--db oracle}
-    py3{,7,8,9,10,11}-oracle: EXTRA_ORACLE_DRIVERS={env:EXTRA_ORACLE_DRIVERS:--dbdriver cx_oracle --dbdriver oracledb}
+    oracle: EXTRA_ORACLE_DRIVERS={env:EXTRA_ORACLE_DRIVERS:--dbdriver cx_oracle --dbdriver oracledb}
 
     sqlite: SQLITE={env:TOX_SQLITE:--db sqlite}
     sqlite_file: SQLITE={env:TOX_SQLITE_FILE:--db sqlite_file}
 
-    py3{,7,8,9,10,11}-sqlite: EXTRA_SQLITE_DRIVERS={env:EXTRA_SQLITE_DRIVERS:--dbdriver sqlite --dbdriver pysqlite_numeric --dbdriver aiosqlite}
+    py{3,37,38,39,310,311}-sqlite: EXTRA_SQLITE_DRIVERS={env:EXTRA_SQLITE_DRIVERS:--dbdriver sqlite --dbdriver pysqlite_numeric --dbdriver aiosqlite}
 
-    py3{,7,8,9}-sqlite_file: EXTRA_SQLITE_DRIVERS={env:EXTRA_SQLITE_DRIVERS:--dbdriver sqlite --dbdriver aiosqlite --dbdriver pysqlcipher}
+    py{37,38,39}-sqlite_file: EXTRA_SQLITE_DRIVERS={env:EXTRA_SQLITE_DRIVERS:--dbdriver sqlite --dbdriver aiosqlite --dbdriver pysqlcipher}
 
     # omit pysqlcipher for Python 3.10
-    py3{,10,11}-sqlite_file: EXTRA_SQLITE_DRIVERS={env:EXTRA_SQLITE_DRIVERS:--dbdriver sqlite --dbdriver aiosqlite}
+    py{3,310,311}-sqlite_file: EXTRA_SQLITE_DRIVERS={env:EXTRA_SQLITE_DRIVERS:--dbdriver sqlite --dbdriver aiosqlite}
 
     postgresql: POSTGRESQL={env:TOX_POSTGRESQL:--db postgresql}
 
-    py3{,7,8,9,10,11}-postgresql: EXTRA_PG_DRIVERS={env:EXTRA_PG_DRIVERS:--dbdriver psycopg2 --dbdriver asyncpg --dbdriver pg8000 --dbdriver psycopg --dbdriver psycopg_async}
+    py{3,37,38,39,310,311}-postgresql: EXTRA_PG_DRIVERS={env:EXTRA_PG_DRIVERS:--dbdriver psycopg2 --dbdriver asyncpg --dbdriver pg8000 --dbdriver psycopg --dbdriver psycopg_async}
     py312-postgresql: EXTRA_PG_DRIVERS={env:EXTRA_PG_DRIVERS:--dbdriver psycopg2 --dbdriver pg8000 --dbdriver psycopg --dbdriver psycopg_async}
 
     mysql: MYSQL={env:TOX_MYSQL:--db mysql}
-    py2{,7}-mysql: MYSQL={env:TOX_MYSQL_PY2K:{env:TOX_MYSQL:--db mysql}}
     mysql: EXTRA_MYSQL_DRIVERS={env:EXTRA_MYSQL_DRIVERS:--dbdriver mysqldb --dbdriver pymysql}
 
-    # py3{,7,8,9,10,11}-mysql: EXTRA_MYSQL_DRIVERS={env:EXTRA_MYSQL_DRIVERS:--dbdriver mysqldb --dbdriver pymysql --dbdriver mariadbconnector --dbdriver asyncmy}
-    py3{,7,8,9,10,11}-mysql: EXTRA_MYSQL_DRIVERS={env:EXTRA_MYSQL_DRIVERS:--dbdriver mysqldb --dbdriver pymysql --dbdriver asyncmy}
+    py{3,37,38,39,310,311}-mysql: EXTRA_MYSQL_DRIVERS={env:EXTRA_MYSQL_DRIVERS:--dbdriver mysqldb --dbdriver pymysql --dbdriver asyncmy}
 
     mssql: MSSQL={env:TOX_MSSQL:--db mssql}
-    py3{,7,8,9,10,11}-mssql: EXTRA_MSSQL_DRIVERS={env:EXTRA_MSSQL_DRIVERS:--dbdriver pyodbc --dbdriver pymssql}
+    py{3,37,38,39,310,311}-mssql: EXTRA_MSSQL_DRIVERS={env:EXTRA_MSSQL_DRIVERS:--dbdriver pyodbc --dbdriver pymssql}
 
     oracle,mssql,sqlite_file: IDENTS=--write-idents db_idents.txt