brand_python.py

import argparse
import os
import re


platform_file = os.path.join('Lib', 'platform.py')
get_version_file = os.path.join('Python', 'getversion.c')


def patch_platform(msg):
    with open(platform_file, 'r') as fh:
        lines = list(fh)

    lines_it = iter(lines)
    with open(platform_file, 'w') as fh:
        for line in lines_it:
            fh.write(line)
            if line.startswith('_sys_version_parser'):
                next_line = next(lines_it)
                fh.write("    r'([\w.+]+)\s*" + re.escape(' ' + msg) + "\s*'\n")

def patch_get_version(msg):
    with open(get_version_file, 'r') as fh:
        content = list(fh)

    lines = iter(content)
    with open(get_version_file, 'w') as fh:
        for line in lines:
            if line.strip().startswith('PyOS_snprintf(version, sizeof(version)') and "Stackless" in line:
                fh.write('    PyOS_snprintf(version, sizeof(version),\n')
                fh.write('        "%.80s Stackless %.80s ' + msg.replace('"', '\\"') + ' (%.80s) %.80s",\n')
            else:
                fh.write(line)


msg = os.environ.get('python_branding', '<undefined>')
if msg == '<undefined>':
    msg = "| packaged by conda-forge |" 

# patch_platform(msg)  # not required for stackless
patch_get_version(msg)