Use string literals for novaclient api versions

nova_client_versions.py

from novaclient.client import Client as NovaClient
from ka_auth import get_session
from decimal import Decimal

str_versions = ['2', '2.1', '2.10', '2.26', '2.59', '2.60']

if __name__ == '__main__':
    novaclient = __import__('novaclient')
    attrs = ('API_MAX_VERSION', 'API_MIN_VERSION', '__version__')
    for a in attrs:
        print('novaclient.{:16}: {}'.format(a, getattr(novaclient, a)))

    def typed_versions(ver):
        types = (float, int, str, Decimal)
        for t in types:
            try:
                yield (t, t(ver))
            except ValueError:
                pass

    sess = get_session()
    print()
    print('Versions to test:', str_versions)
    print()
    for ver in str_versions:
        for type_, arg in typed_versions(ver):
            nova = NovaClient(arg, session=sess)
            print(
                    '{:4} as {:8} ({:>4}): {}'.format(ver, type_.__name__, arg, nova.api_version)
            )

output.txt

novaclient.API_MAX_VERSION : API Version Major: 2, Minor: 65
novaclient.API_MIN_VERSION : API Version Major: 2, Minor: 1
novaclient.__version__     : 11.0.0

Versions to test: ['2', '2.1', '2.10', '2.26', '2.59', '2.60']

2    as float    ( 2.0): API Version Major: 2, Minor: 0
2    as int      (   2): API Version Major: 2, Minor: 0
2    as str      (   2): API Version Major: 2, Minor: 0
2    as Decimal  (   2): API Version Major: 2, Minor: 0
2.1  as float    ( 2.1): API Version Major: 2, Minor: 1
2.1  as str      ( 2.1): API Version Major: 2, Minor: 1
2.1  as Decimal  ( 2.1): API Version Major: 2, Minor: 1
2.10 as float    ( 2.1): API Version Major: 2, Minor: 1
2.10 as str      (2.10): API Version Major: 2, Minor: 10
2.10 as Decimal  (2.10): API Version Major: 2, Minor: 10
2.26 as float    (2.26): API Version Major: 2, Minor: 26
2.26 as str      (2.26): API Version Major: 2, Minor: 26
2.26 as Decimal  (2.26): API Version Major: 2, Minor: 26
2.59 as float    (2.59): API Version Major: 2, Minor: 59
2.59 as str      (2.59): API Version Major: 2, Minor: 59
2.59 as Decimal  (2.59): API Version Major: 2, Minor: 59
2.60 as float    ( 2.6): API Version Major: 2, Minor: 6
2.60 as str      (2.60): API Version Major: 2, Minor: 60
2.60 as Decimal  (2.60): API Version Major: 2, Minor: 60