pyjwt 2.0.0 is not compatible with Python 3.5

[xupefei]

Summary

pyjwt 2.0.0 is using a syntax only valid in Python 3.6 onwards that breaks Python 3.5 support.

Possible resolutions would be indicating version 2.0.0 available for Python 3.6 onwards in https://github.com/jpadilla/pyjwt/blob/master/CHANGELOG.md.

Ref: PyGithub/PyGithub#1796

Expected Result

No error.

Actual Result

  ...
  File "/ephemeral/jenkins/shared_job_workspace/cb93627ca717/pipeline/xxx/xxx/.venv/lib/python3.5/site-packages/github/__init__.py", line 58, in <module>
    from github.MainClass import Github, GithubIntegration
  File "/ephemeral/jenkins/shared_job_workspace/cb93627ca717/pipeline/xxx/xxx/.venv/lib/python3.5/site-packages/github/MainClass.py", line 57, in <module>
    import jwt
  File "/ephemeral/jenkins/shared_job_workspace/cb93627ca717/pipeline/xxx/xxx/.venv/lib/python3.5/site-packages/jwt/__init__.py", line 1, in <module>
    from .api_jws import (
  File "/ephemeral/jenkins/shared_job_workspace/cb93627ca717/pipeline/xxx/xxx/.venv/lib/python3.5/site-packages/jwt/api_jws.py", line 134
    **kwargs,
            ^
SyntaxError: invalid syntax

Reproduction Steps

Run the following code in Python 3.5 will fail:

def decode(
    self,
    jwt: str,
    key: str,
    algorithms,
    options,
    **kwargs,
) -> str:
	pass

  File "<stdin>", line 7
    **kwargs,
            ^
SyntaxError: invalid syntax
>>> ) -> str:
  File "<stdin>", line 1
    ) -> str:
    ^
SyntaxError: invalid syntax

In comparison, the following code will run in Python 3.5:

def decode(
    self,
    jwt: str,
    key: str,
    algorithms,
    options,
    **kwargs
) -> str:
	pass

System Information

$ python -m jwt.help

{
  "cryptography": {
    "version": ""
  },
  "implementation": {
    "name": "CPython",
    "version": "3.5.10"
  },
  "platform": {
    "release": "5.4.0-1030-aws",
    "system": "Linux"
  },
  "pyjwt": {
    "version": "2.0.0"
  }
}

This command is only available on PyJWT v1.6.3 and greater. Otherwise,
please provide some basic information about your system.

[jpadilla]

Let's surface this in the changelog #532

[asottile]

@xupefei python_requires is set properly in the metadata -- this likely means you're using a too-old version of pip and/or using easy_install to install the library:

pyjwt/setup.cfg

Line 35 in c96131b

python_requires = >=3.6

[xupefei]

@asottile I believe so. I'm using python3-pip from Ubuntu 16.04 (version 8.1.1), and unfortunately unable to upgrade :(

[asottile]

yeah you need at least pip 9.x -- I'd suggest using a virtuaenv either way and not the system pip/python

[auvipy]

python 3.5 is EOL already so not supportd in v2.0 :)

[clokep]

It would be nice to specify in setup.py that Python > 3.6 is required (via the python_requires option). This will help people to not install an incompatible version.