all: Remove Python 2.7 support.

Python 2.7 has been EOL since January 2020.

Ubuntu oldoldlts (Focal Fossa, 20.04) has Python 3.8.  Debian oldoldstable
(Buster, from 2019) has Python 3.7.  RHEL 8 (from 2019) has Python 3.6.

It's easier than ever to install a modern Python using uv.

Given this, it seems like a fine idea to drop Python 2.7 support.

Even though the build is not tested on Python as old as 3.3, I left
comments stating that "3.3+" is the baseline Python version.  However, it
might make sense to bump this to e.g., 3.10, the oldest Python 3 version
used during CI. Or, using uv or another method actually test on the oldest
Python interpreter that is desirable to support (uv goes back to Python 3.7
easily; in October 2025, the oldest supported Python interpreter version
will be 3.10)

Signed-off-by: Jeff Epler <jepler@gmail.com>

py/makeqstrdata.py

@@ -1,7 +1,7 @@
 """
 Process raw qstr file and output qstr data with length, hash and data bytes.
 
-This script works with Python 2.6, 2.7, 3.3 and 3.4.
+This script works with Python 3.3+.
 """
 
 from __future__ import print_function
@@ -9,13 +9,7 @@ from __future__ import print_function
 import re
 import sys
 
-# Python 2/3/MicroPython compatibility:
-#   - iterating through bytes is different
-#   - codepoint2name from html.entities is hard-coded
-if sys.version_info[0] == 2:
-    bytes_cons = lambda val, enc=None: bytearray(val)
-elif sys.version_info[0] == 3:  # Also handles MicroPython
-    bytes_cons = bytes
+bytes_cons = bytes
 
 # fmt: off
 codepoint2name = {
@@ -57,7 +51,6 @@ codepoint2name = {
     253: "yacute", 165: "yen", 255: "yuml", 950: "zeta", 8205: "zwj", 8204: "zwnj"
 }
 # fmt: on
-# end compatibility code
 
 codepoint2name[ord("-")] = "hyphen"