SyntaxError: invalid from typing import TYPE_CHECKING

[ninja18]

Virtual env was created and I edited the pipfile.lock once before creating the env
Is this a bug or problem with my environment???

Pinning VCS Packages...Branch mil set up to track remote branch mil from origin.
Switched to a new branch 'mil'
✘ Locking Failed! 
Traceback (most recent call last):
  File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/resolver.py", line 126, in <module>
    main()
  File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/resolver.py", line 119, in main
    parsed.requirements_dir, parsed.packages)
  File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/resolver.py", line 85, in _main
    requirements_dir=requirements_dir,
  File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/resolver.py", line 69, in resolve
    req_dir=requirements_dir
  File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/utils.py", line 700, in resolve_deps
    from .vendor.requirementslib.models.requirements import Requirement
  File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/vendor/requirementslib/__init__.py", line 14, in <module>
    from .models.pipfile import Pipfile
  File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/vendor/requirementslib/models/pipfile.py", line 23, in <module>
    from ..environment import MYPY_RUNNING
  File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/vendor/requirementslib/environment.py", line 17, in <module>
    MYPY_RUNNING = os.environ.get("MYPY_RUNNING", is_type_checking())
  File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/vendor/requirementslib/environment.py", line 10, in is_type_checking
    from typing import TYPE_CHECKING
  File "/home/ninja/anaconda/lib/python3.6/site-packages/typing.py", line 133
    def __new__(cls, name, bases, namespace, *, _root=False):
                                              ^
SyntaxError: invalid syntax
File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/resolver.py", line 126, in <module>
    main()
  File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/resolver.py", line 119, in main
    parsed.requirements_dir, parsed.packages)
  File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/resolver.py", line 85, in _main
    requirements_dir=requirements_dir,
  File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/resolver.py", line 69, in resolve
    req_dir=requirements_dir
  File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/utils.py", line 700, in resolve_deps
    from .vendor.requirementslib.models.requirements import Requirement
  File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/vendor/requirementslib/__init__.py", line 14, in <module>
    from .models.pipfile import Pipfile
  File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/vendor/requirementslib/models/pipfile.py", line 23, in <module>
    from ..environment import MYPY_RUNNING
  File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/vendor/requirementslib/environment.py", line 17, in <module>
    MYPY_RUNNING = os.environ.get("MYPY_RUNNING", is_type_checking())
  File "/home/ninja/anaconda/lib/python3.6/site-packages/pipenv/vendor/requirementslib/environment.py", line 10, in is_type_checking
    from typing import TYPE_CHECKING
  File "/home/ninja/anaconda/lib/python3.6/site-packages/typing.py", line 133
    def __new__(cls, name, bases, namespace, *, _root=False):
                                              ^
SyntaxError: invalid syntax

[frostming]

I think it is fixed in master, isn't it?

[ninja18]

I have installed the latest release 2018.11.26 and i don't find any commit regarding this issue after that.

[techalchemy]

the master branch is installable via pip install -e git+https://github.com/pypa/pipenv.git@master#egg=pipenv

if you are still encountering this problem installing that way, please let us know.

[techalchemy]

btw it seems like anaconda installs a broken version of typing?

[techalchemy]

@frostming did you remove typing from vendored dependencies as well as setup.py here? Why?

[frostming]

@techalchemy

btw it seems like anaconda installs a broken version of typing?

No, it doesn't, the failure was due to the incompatibility between the typing module and the Python interpreter used by venv. @ninja18 was likely to be using python < 3.5 in the venv. See my explanations below.

@frostming did you remove typing from vendored dependencies as well as setup.py here? Why?

Yes, I did. The typing module installed from PyPI has two different implementations. Depending on the python version being used, a py2 compatible version or py>=3.5 version will be installed.

This will bring trouble when venv resolving dependencies, Pipenv's site packages path will be prepended to the sys.path, so incompatibility may exist between Pipenv python and venv python.
The best solution is to avoid shipping pipenv with pre-installed typing module in site packages.

From the above explanation, we can see the real problem here is anaconda has its typing module installed in site packages(I don't know why but it should have been shipped with Python 3.6 under lib path)

Workaround

I don't know why typing is under site packages and it will be better if you can remove it and use the lib/typing instead. Otherwise, you have to install a redundant typing in your venv. @ninja18 let me know if it works for you.

[brainwane]

Just spoke with @techalchemy and he needs more info to decide whether this still needs fixing. @ninja18 can you try what @frostming suggested in #3520 (comment) and tell us whether it worked for you?

[frostming]

This is not a release blocker, moving it out of the milestone.