How to determine the version of PyJWT?

Question

I have two different software environments ( Environment A and Environment B ), and I'm trying to run PyJWT in both environments. It works fine in one environment Wednesday A , but is not working Wednesday Bed and .

Error with which I get Wednesday Bed and , when I call jwt.encode()to algorithm== ES: Algorithm not supported.

I'm trying to understand why it works in Wednesday A , but not Wednesday Bed and . Both environments seem to have different versions of PyJWT installed. But to determine which version of PyJWT is installed on Environment B is difficult for me. How can i do this?

I ran the following tool code for both Environment A and Environment B :

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))

In Environment A, the encoding succeeds:

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'}

In Environment B, an error does not occur. You can see that I cannot say which version of PyJWT is running. However, this version of PyJWT does not have an algorithm ES256that I am trying to use:

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

Answer 1

The PyJWT attribute .__version__appeared in 0.2.2in this commit.

Typically, to find the version of a package that was installed using setuptools, you need to run the following code:

import pkg_resources
print pkg_resources.require("jwt")[0].version

pip, linux:

pip show jwt | grep Version

python:

import pip
print next(pip.commands.show.search_packages_info(['jwt']))['version']