import subprocess, os, tempfile, sys
from locale import setlocale, LC_ALL

locale = 'fr_FR.iso88591'
encoding = 'iso-8859-1'
modname = 'issue3080\xE4'
modname_bytes = modname.encode(encoding)
code = b'import ' + modname_bytes
mod_filename = modname_bytes + b'.py'
setlocale(LC_ALL, locale)

olddir = os.getcwd()
with tempfile.TemporaryDirectory() as tmpdir:
    os.chdir(tmpdir)

    text = 'issue #3080'
    with open(mod_filename, 'w') as fp:
        print("print('{}')".format(text), file=fp)
    files = os.listdir(b'.')
    print("Files in {}: {}".format(tmpdir, files))

    env = os.environ.copy()
    env['LC_ALL'] = locale
    process = subprocess.Popen([sys.executable, '-c', code], env=env, stdout=subprocess.PIPE)
    stdout, stderr = process.communicate()
    line = stdout.rstrip().decode('ascii')
    assert line == text
os.chdir(olddir)