How to determine the version of PyJWT?
<p>I have two different software environments (<strong>Environment A</strong> and <strong>Environment B</strong>) and I'm trying to run PyJWT on both environments. It is working perfectly fine on one environment <strong>Environment A</strong> but fail on <strong>Environment B</strong>. </p>

<p>The error I'm getting on <strong>Environment B</strong> when I call <code>jwt.encode()</code> with <code>algorithm</code> == <code>ES</code> is: <code>Algorithm not supported</code>.</p>

<p>I'm trying to figure out why it works on <strong>Environment A</strong> but not <strong>Environment B</strong>. It seems like the two environments have different versions of PyJWT installed. But determining which version of PyJWT is installed on <strong>Environment B</strong> is proving difficult for me. How can I do it??</p>

<p>I ran the following instrumented code on both <strong>Environment A</strong> and <strong>Environment B</strong>:</p>

<pre><code>import jwt, cryptography, sys, pkg_resources

my_private_key = """XXXXX"""
my_public_key = """YYYYYY"""
original = {"Hello": "World"}
print "sys.version = {}".format(str(sys.version))

try:
    print "dir(jwt) = {}".format(str(dir(jwt)))
except Exception as e:
    print "Failed to get dir of jwt module: {}".format(e)

try:
    print "dir(cryptography) = {}".format(str(dir(cryptography)))
except Exception as e:
    print "Failed to get dir of cryptography module: {}".format(e)

try:
    print "jwt = {}".format(str(jwt.__version__))
except Exception as e:
    print "Failed to get version of jwt module using .__version: {}".format(e)
try:
    print "cryptography = {}".format(str(cryptography.__version__))
except Exception as e:
    print "Failed to get version of cryptography module using .__version: {}".format(e)

try:
    print "pkg_resources.require('jwt')[0].version = {}".format(str(pkg_resources.require("jwt")[0].version))
except Exception as e:
    print "Failed to get version of jwt module via pkg_resources: {}".format(e)

try:
    print "pkg_resources.require('cryptography')[0].version = {}".format(str(pkg_resources.require("cryptography")[0].version))
except Exception as e:
    print "Failed to get version of cryptography module via pkg_resources: {}".format(e)

try:
    print "original = {}".format(str(original))
    encoded = jwt.encode(original, my_private_key, algorithm='ES256')
except Exception as e:
    print "encoding exception = {}".format(str(e))
else:
    try:
        print "encoded = {}".format(str(encoded))
        unencoded = jwt.decode(encoded, my_public_key, algorithms=['ES256'])
    except Exception as e:
        print "decoding exception = {}".format(str(e))
    else:
        print "unencoded = {}".format(str(unencoded))
</code></pre>

<p>On <strong>Environment A</strong>, the encoding succeeds:</p>

<pre><code>sys.version = 2.7.12 (default, Sep  1 2016, 22:14:00)
[GCC 4.8.3 20140911 (Red Hat 4.8.3-9)]
dir(jwt) = ['DecodeError', 'ExpiredSignature', 'ExpiredSignatureError', 'ImmatureSignatureError', 'InvalidAudience', 'InvalidAudienceError', 'InvalidIssuedAtError', 'InvalidIssuer', 'InvalidIssuerError', 'InvalidTokenError', 'MissingRequiredClaimError', 'PyJWS', 'PyJWT', '__author__', '__builtins__', '__copyright__', '__doc__', '__file__', '__license__', '__name__', '__package__', '__path__', '__title__', '__version__', 'algorithms', 'api_jws', 'api_jwt', 'compat', 'decode', 'encode', 'exceptions', 'get_unverified_header', 'register_algorithm', 'unregister_algorithm', 'utils']
dir(cryptography) = ['__about__', '__all__', '__author__', '__builtins__', '__copyright__', '__doc__', '__email__', '__file__', '__license__', '__name__', '__package__', '__path__', '__summary__', '__title__', '__uri__', '__version__', 'absolute_import', 'division', 'exceptions', 'hazmat', 'print_function', 'sys', 'utils', 'warnings']
jwt = 1.4.2
cryptography = 1.5.2
Failed to get version of jwt module via pkg_resources: jwt
pkg_resources.require('cryptography')[0].version = 1.5.2
original = {'Hello': 'World'}
encoded = eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJIZWxsbyI6IldvcmxkIn0.ciaXCcO2gTqsQ4JUEKj5q4YX6vfHu33XY32g2MNIVEDXHNllpuqDCj-cCrlGPf6hGNifAJbNI9kBaAyuCIwyJQ
unencoded = {u'Hello': u'World'}
</code></pre>

<p>On <strong>Environment B</strong> the the encoding fails. You can see that I cannot tell what version of PyJWT is running. However this version of PyJWT doesn't have the algorithm <code>ES256</code> that I'm trying to use: </p>

<pre><code>sys.version = 2.7.12 (default, Sep  1 2016, 22:14:00) 
[GCC 4.8.3 20140911 (Red Hat 4.8.3-9)]"
dir(jwt) = ['DecodeError', 'ExpiredSignature', 'Mapping', 'PKCS1_v1_5', 'SHA256', 'SHA384', 'SHA512', '__all__', '__builtins__', '__doc__', '__file__', '__name__', '__package__', '__path__', 'base64', 'base64url_decode', 'base64url_encode', 'binascii', 'constant_time_compare', 'datetime', 'decode', 'encode', 'hashlib', 'header', 'hmac', 'json', 'load', 'signing_methods', 'sys', 'timegm', 'unicode_literals', 'verify_methods', 'verify_signature']
dir(cryptography) = ['__about__', '__all__', '__author__', '__builtins__', '__copyright__', '__doc__', '__email__', '__file__', '__license__', '__name__', '__package__', '__path__', '__summary__', '__title__', '__uri__', '__version__', 'absolute_import', 'division', 'print_function', 'sys', 'warnings']
Failed to get version of jwt module using .__version: 'module' object has no attribute '__version__'
cryptography = 1.5.2
Failed to get version of jwt module via pkg_resources: jwt
pkg_resources.require('cryptography')[0].version = 1.5.2
original = {'Hello': 'World'}
encoding exception = Algorithm not supported
</code></pre>