Pipenv.lock file resolves differently on the second pass (with iPython)

[scott-vsi]

Issue description

Running pipenv lock twice produces a different Pipfile.lock

Expected result

I would expect it to produce the same lock file both times

Actual result and Steps to replicate

$ cat Pipfile
[[source]]
url = "https://pypi.org/simple"
verify_ssl = true
name = "pypi"

[dev-packages]

[packages]
ipython = "*"

[requires]
python_version = "2.7"

$ PIPENV_CACHE_DIR=./venv pipenv lock --verbose

output

Creating a virtualenv for this project...
Pipfile: /Users/sgrichar/loki/test/Pipfile
Using /usr/local/bin/python2.7 (2.7.14) to create virtualenv...
Running virtualenv with interpreter /usr/local/bin/python2.7
New python executable in /Users/sgrichar/.local/share/virtualenvs/test-CrH5_LA2/bin/python2.7
Also creating executable in /Users/sgrichar/.local/share/virtualenvs/test-CrH5_LA2/bin/python
Installing setuptools, pip, wheel...done.
Setting project for test-CrH5_LA2 to /Users/sgrichar/loki/test

Virtualenv location: /Users/sgrichar/.local/share/virtualenvs/test-CrH5_LA2
Locking [dev-packages] dependencies...
Locking [packages] dependencies...
using sources: [{u'url': u'https://pypi.org/simple', u'verify_ssl': True, u'name': u'pypi'}]
Using pip: -i https://pypi.org/simple

                          ROUND 1                           
Current constraints:
  ipython (from -r /var/folders/g9/pytwf10x5y58h92hx7x70qnh000105/T/pipenv-7iWEdP-requirements/pipenv-Ek2M6Q-constraints.txt (line 2))

Finding the best candidates:
  found candidate ipython==5.8.0 (constraint was <any>)

Finding secondary dependencies:
  ipython==5.8.0 not in cache, need to check index
  ipython==5.8.0            requires appnope; sys_platform == "darwin", backports.shutil-get-terminal-size; python_version == "2.7", decorator, enum34; python_version == "2.7", ipython-genutils, ipython==5.8.0, pathlib2; python_version == "2.7" or python_version == "3.3", pexpect; sys_platform != "win32", pickleshare, prompt-toolkit<2.0.0,>=1.0.4, ptyprocess>=0.5, pygments, scandir; python_version < "3.5", setuptools>=18.5, simplegeneric>0.8, six>=1.9.0, traitlets>=4.2, wcwidth

New dependencies found in this round:
  adding [u'appnope', '', '[]']
  adding [u'backports.shutil-get-terminal-size', '', '[]']
  adding [u'decorator', '', '[]']
  adding [u'enum34', '', '[]']
  adding [u'ipython', '==5.8.0', '[]']
  adding [u'ipython-genutils', '', '[]']
  adding [u'pathlib2', '', '[]']
  adding [u'pexpect', '', '[]']
  adding [u'pickleshare', '', '[]']
  adding [u'prompt-toolkit', '<2.0.0,>=1.0.4', '[]']
  adding [u'ptyprocess', '>=0.5', '[]']
  adding [u'pygments', '', '[]']
  adding [u'scandir', '', '[]']
  adding [u'simplegeneric', '>0.8', '[]']
  adding [u'six', '>=1.9.0', '[]']
  adding [u'traitlets', '>=4.2', '[]']
  adding [u'wcwidth', '', '[]']
Removed dependencies in this round:
Unsafe dependencies in this round:
------------------------------------------------------------
Result of round 1: not stable

                          ROUND 2                           
Current constraints:
  appnope
  backports.shutil-get-terminal-size
  decorator
  enum34
  ipython==5.8.0 (from -r /var/folders/g9/pytwf10x5y58h92hx7x70qnh000105/T/pipenv-7iWEdP-requirements/pipenv-Ek2M6Q-constraints.txt (line 2))
  ipython-genutils
  pathlib2
  pexpect
  pickleshare
  prompt-toolkit<2.0.0,>=1.0.4
  ptyprocess>=0.5
  pygments
  scandir
  simplegeneric>0.8
  six>=1.9.0
  traitlets>=4.2
  wcwidth

Finding the best candidates:
  found candidate appnope==0.1.0 (constraint was <any>)
  found candidate backports.shutil-get-terminal-size==1.0.0 (constraint was <any>)
  found candidate decorator==4.3.0 (constraint was <any>)
  found candidate enum34==1.1.6 (constraint was <any>)
  found candidate ipython==5.8.0 (constraint was ==5.8.0)
  found candidate ipython-genutils==0.2.0 (constraint was <any>)
  found candidate pathlib2==2.3.2 (constraint was <any>)
  found candidate pexpect==4.6.0 (constraint was <any>)
  found candidate pickleshare==0.7.5 (constraint was <any>)
  found candidate prompt-toolkit==1.0.15 (constraint was >=1.0.4,<2.0.0)
  found candidate ptyprocess==0.6.0 (constraint was >=0.5)
  found candidate pygments==2.2.0 (constraint was <any>)
  found candidate scandir==1.9.0 (constraint was <any>)
  found candidate simplegeneric==0.8.1 (constraint was >0.8)
  found candidate six==1.11.0 (constraint was >=1.9.0)
  found candidate traitlets==4.3.2 (constraint was >=4.2)
  found candidate wcwidth==0.1.7 (constraint was <any>)

Finding secondary dependencies:
  decorator==4.3.0 not in cache, need to check index
  decorator==4.3.0          requires decorator==4.3.0
  six==1.11.0 not in cache, need to check index
  six==1.11.0               requires six==1.11.0
  ipython==5.8.0            requires appnope; sys_platform == "darwin", backports.shutil-get-terminal-size; python_version == "2.7", decorator, enum34; python_version == "2.7", ipython-genutils, ipython==5.8.0, pathlib2; python_version == "2.7" or python_version == "3.3", pexpect; sys_platform != "win32", pickleshare, prompt-toolkit<2.0.0,>=1.0.4, ptyprocess>=0.5, pygments, scandir; python_version < "3.5", setuptools>=18.5, simplegeneric>0.8, six>=1.9.0, traitlets>=4.2, wcwidth
  pexpect==4.6.0 not in cache, need to check index
  pexpect==4.6.0            requires pexpect==4.6.0, ptyprocess>=0.5
  prompt-toolkit==1.0.15 not in cache, need to check index
  prompt-toolkit==1.0.15    requires prompt-toolkit==1.0.15, six>=1.9.0, wcwidth
  scandir==1.9.0 not in cache, need to check index
  scandir==1.9.0            requires scandir==1.9.0
  appnope==0.1.0 not in cache, need to check index
  appnope==0.1.0            requires appnope==0.1.0
  traitlets==4.3.2 not in cache, need to check index
  traitlets==4.3.2          requires decorator, enum34; python_version == "2.7", ipython-genutils, six, traitlets==4.3.2
  ipython-genutils==0.2.0 not in cache, need to check index
  ipython-genutils==0.2.0   requires ipython-genutils==0.2.0
  pickleshare==0.7.5 not in cache, need to check index
  pickleshare==0.7.5        requires pathlib2; python_version in "2.6 2.7 3.2 3.3", pickleshare==0.7.5, scandir; python_version < "3.5", six
  backports.shutil-get-terminal-size==1.0.0 not in cache, need to check index
  backports.shutil-get-terminal-size==1.0.0 requires backports.shutil-get-terminal-size==1.0.0
  ptyprocess==0.6.0 not in cache, need to check index
  ptyprocess==0.6.0         requires ptyprocess==0.6.0
  simplegeneric==0.8.1 not in cache, need to check index
  simplegeneric==0.8.1      requires simplegeneric==0.8.1
  wcwidth==0.1.7 not in cache, need to check index
  wcwidth==0.1.7            requires wcwidth==0.1.7
  pygments==2.2.0 not in cache, need to check index
  pygments==2.2.0           requires pygments==2.2.0
  enum34==1.1.6 not in cache, need to check index
  enum34==1.1.6             requires enum34==1.1.6
  pathlib2==2.3.2 not in cache, need to check index
  pathlib2==2.3.2           requires pathlib2==2.3.2, scandir; python_version < "3.5", six

New dependencies found in this round:
  adding [u'appnope', '==0.1.0', '[]']
  adding [u'backports.shutil-get-terminal-size', '==1.0.0', '[]']
  adding [u'decorator', '==4.3.0', '[]']
  adding [u'enum34', '==1.1.6', '[]']
  adding [u'ipython-genutils', '==0.2.0', '[]']
  adding [u'pathlib2', '==2.3.2', '[]']
  adding [u'pexpect', '==4.6.0', '[]']
  adding [u'pickleshare', '==0.7.5', '[]']
  adding [u'prompt-toolkit', '<2.0.0,==1.0.15,>=1.0.4', '[]']
  adding [u'ptyprocess', '==0.6.0,>=0.5', '[]']
  adding [u'pygments', '==2.2.0', '[]']
  adding [u'scandir', '==1.9.0', '[]']
  adding [u'simplegeneric', '==0.8.1,>0.8', '[]']
  adding [u'six', '==1.11.0,>=1.9.0', '[]']
  adding [u'traitlets', '==4.3.2,>=4.2', '[]']
  adding [u'wcwidth', '==0.1.7', '[]']
Removed dependencies in this round:
  removing [u'appnope', '', '[]']
  removing [u'backports.shutil-get-terminal-size', '', '[]']
  removing [u'decorator', '', '[]']
  removing [u'enum34', '', '[]']
  removing [u'ipython-genutils', '', '[]']
  removing [u'pathlib2', '', '[]']
  removing [u'pexpect', '', '[]']
  removing [u'pickleshare', '', '[]']
  removing [u'prompt-toolkit', '<2.0.0,>=1.0.4', '[]']
  removing [u'ptyprocess', '>=0.5', '[]']
  removing [u'pygments', '', '[]']
  removing [u'scandir', '', '[]']
  removing [u'simplegeneric', '>0.8', '[]']
  removing [u'six', '>=1.9.0', '[]']
  removing [u'traitlets', '>=4.2', '[]']
  removing [u'wcwidth', '', '[]']
Unsafe dependencies in this round:
------------------------------------------------------------
Result of round 2: not stable

                          ROUND 3                           
Current constraints:
  appnope==0.1.0
  backports.shutil-get-terminal-size==1.0.0
  decorator==4.3.0
  enum34==1.1.6
  ipython==5.8.0 (from -r /var/folders/g9/pytwf10x5y58h92hx7x70qnh000105/T/pipenv-7iWEdP-requirements/pipenv-Ek2M6Q-constraints.txt (line 2))
  ipython-genutils==0.2.0
  pathlib2==2.3.2
  pexpect==4.6.0
  pickleshare==0.7.5
  prompt-toolkit<2.0.0,==1.0.15,>=1.0.4
  ptyprocess==0.6.0,>=0.5
  pygments==2.2.0
  scandir==1.9.0
  simplegeneric==0.8.1,>0.8
  six==1.11.0,>=1.9.0
  traitlets==4.3.2,>=4.2
  wcwidth==0.1.7

Finding the best candidates:
  found candidate appnope==0.1.0 (constraint was ==0.1.0)
  found candidate backports.shutil-get-terminal-size==1.0.0 (constraint was ==1.0.0)
  found candidate decorator==4.3.0 (constraint was ==4.3.0)
  found candidate enum34==1.1.6 (constraint was ==1.1.6)
  found candidate ipython==5.8.0 (constraint was ==5.8.0)
  found candidate ipython-genutils==0.2.0 (constraint was ==0.2.0)
  found candidate pathlib2==2.3.2 (constraint was ==2.3.2)
  found candidate pexpect==4.6.0 (constraint was ==4.6.0)
  found candidate pickleshare==0.7.5 (constraint was ==0.7.5)
  found candidate prompt-toolkit==1.0.15 (constraint was ==1.0.15,>=1.0.4,<2.0.0)
  found candidate ptyprocess==0.6.0 (constraint was >=0.5,==0.6.0)
  found candidate pygments==2.2.0 (constraint was ==2.2.0)
  found candidate scandir==1.9.0 (constraint was ==1.9.0)
  found candidate simplegeneric==0.8.1 (constraint was >0.8,==0.8.1)
  found candidate six==1.11.0 (constraint was ==1.11.0,>=1.9.0)
  found candidate traitlets==4.3.2 (constraint was >=4.2,==4.3.2)
  found candidate wcwidth==0.1.7 (constraint was ==0.1.7)

Finding secondary dependencies:
  pathlib2==2.3.2           requires pathlib2==2.3.2, scandir; python_version < "3.5", six
  enum34==1.1.6             requires enum34==1.1.6
  pickleshare==0.7.5        requires pathlib2; python_version in "2.6 2.7 3.2 3.3", pickleshare==0.7.5, scandir; python_version < "3.5", six
  ipython-genutils==0.2.0   requires ipython-genutils==0.2.0
  backports.shutil-get-terminal-size==1.0.0 requires backports.shutil-get-terminal-size==1.0.0
  pexpect==4.6.0            requires pexpect==4.6.0, ptyprocess>=0.5
  simplegeneric==0.8.1      requires simplegeneric==0.8.1
  prompt-toolkit==1.0.15    requires prompt-toolkit==1.0.15, six>=1.9.0, wcwidth
  ipython==5.8.0            requires appnope; sys_platform == "darwin", backports.shutil-get-terminal-size; python_version == "2.7", decorator, enum34; python_version == "2.7", ipython-genutils, ipython==5.8.0, pathlib2; python_version == "2.7" or python_version == "3.3", pexpect; sys_platform != "win32", pickleshare, prompt-toolkit<2.0.0,>=1.0.4, ptyprocess>=0.5, pygments, scandir; python_version < "3.5", setuptools>=18.5, simplegeneric>0.8, six>=1.9.0, traitlets>=4.2, wcwidth
  six==1.11.0               requires six==1.11.0
  scandir==1.9.0            requires scandir==1.9.0
  ptyprocess==0.6.0         requires ptyprocess==0.6.0
  traitlets==4.3.2          requires decorator, enum34; python_version == "2.7", ipython-genutils, six, traitlets==4.3.2
  pygments==2.2.0           requires pygments==2.2.0
  wcwidth==0.1.7            requires wcwidth==0.1.7
  appnope==0.1.0            requires appnope==0.1.0
  decorator==4.3.0          requires decorator==4.3.0
------------------------------------------------------------
Result of round 3: stable, done

Updated Pipfile.lock (e4cc43)!

$ cat Pipfile.lock | grep -B4 pathlib
        "pathlib2": {
            "hashes": [
                "sha256:8eb170f8d0d61825e09a95b38be068299ddeda82f35e96c3301a8a5e7604cb83",
                "sha256:d1aa2a11ba7b8f7b21ab852b1fb5afb277e1bb99d5dfc663380b5015c0d80c5a"
            ],
            "markers": "python_version == '2.7' or python_version == '3.3'",
            "version": "==2.3.2"
        },

In this form, pathlib is not actually installed after running pipenv install (so ipython is broken). Now, after re-running the command, the lock file has changed:

$ PIPENV_CACHE_DIR=./venv pipenv lock --verbose

output

Locking [dev-packages] dependencies...
Locking [packages] dependencies...
using sources: [{u'url': u'https://pypi.org/simple', u'verify_ssl': True, u'name': u'pypi'}]
Using pip: -i https://pypi.org/simple

                          ROUND 1                           
Current constraints:
  ipython (from -r /var/folders/g9/pytwf10x5y58h92hx7x70qnh000105/T/pipenv-QdaxJp-requirements/pipenv-rV2j1p-constraints.txt (line 2))

Finding the best candidates:
  found candidate ipython==5.8.0 (constraint was <any>)

Finding secondary dependencies:
  ipython==5.8.0            requires appnope; sys_platform == "darwin", backports.shutil-get-terminal-size; python_version == "2.7", decorator, enum34; python_version == "2.7", ipython-genutils, ipython==5.8.0, pathlib2; python_version == "2.7" or python_version == "3.3", pexpect; sys_platform != "win32", pickleshare, prompt-toolkit<2.0.0,>=1.0.4, ptyprocess>=0.5, pygments, scandir; python_version < "3.5", setuptools>=18.5, simplegeneric>0.8, six>=1.9.0, traitlets>=4.2, wcwidth

New dependencies found in this round:
  adding [u'appnope', '', '[]']
  adding [u'backports.shutil-get-terminal-size', '', '[]']
  adding [u'decorator', '', '[]']
  adding [u'enum34', '', '[]']
  adding [u'ipython', '==5.8.0', '[]']
  adding [u'ipython-genutils', '', '[]']
  adding [u'pathlib2', '', '[]']
  adding [u'pexpect', '', '[]']
  adding [u'pickleshare', '', '[]']
  adding [u'prompt-toolkit', '<2.0.0,>=1.0.4', '[]']
  adding [u'ptyprocess', '>=0.5', '[]']
  adding [u'pygments', '', '[]']
  adding [u'scandir', '', '[]']
  adding [u'simplegeneric', '>0.8', '[]']
  adding [u'six', '>=1.9.0', '[]']
  adding [u'traitlets', '>=4.2', '[]']
  adding [u'wcwidth', '', '[]']
Removed dependencies in this round:
Unsafe dependencies in this round:
------------------------------------------------------------
Result of round 1: not stable

                          ROUND 2                           
Current constraints:
  appnope
  backports.shutil-get-terminal-size
  decorator
  enum34
  ipython==5.8.0 (from -r /var/folders/g9/pytwf10x5y58h92hx7x70qnh000105/T/pipenv-QdaxJp-requirements/pipenv-rV2j1p-constraints.txt (line 2))
  ipython-genutils
  pathlib2
  pexpect
  pickleshare
  prompt-toolkit<2.0.0,>=1.0.4
  ptyprocess>=0.5
  pygments
  scandir
  simplegeneric>0.8
  six>=1.9.0
  traitlets>=4.2
  wcwidth

Finding the best candidates:
  found candidate appnope==0.1.0 (constraint was <any>)
  found candidate backports.shutil-get-terminal-size==1.0.0 (constraint was <any>)
  found candidate decorator==4.3.0 (constraint was <any>)
  found candidate enum34==1.1.6 (constraint was <any>)
  found candidate ipython==5.8.0 (constraint was ==5.8.0)
  found candidate ipython-genutils==0.2.0 (constraint was <any>)
  found candidate pathlib2==2.3.2 (constraint was <any>)
  found candidate pexpect==4.6.0 (constraint was <any>)
  found candidate pickleshare==0.7.5 (constraint was <any>)
  found candidate prompt-toolkit==1.0.15 (constraint was >=1.0.4,<2.0.0)
  found candidate ptyprocess==0.6.0 (constraint was >=0.5)
  found candidate pygments==2.2.0 (constraint was <any>)
  found candidate scandir==1.9.0 (constraint was <any>)
  found candidate simplegeneric==0.8.1 (constraint was >0.8)
  found candidate six==1.11.0 (constraint was >=1.9.0)
  found candidate traitlets==4.3.2 (constraint was >=4.2)
  found candidate wcwidth==0.1.7 (constraint was <any>)

Finding secondary dependencies:
  pickleshare==0.7.5        requires pathlib2; python_version in "2.6 2.7 3.2 3.3", pickleshare==0.7.5, scandir; python_version < "3.5", six
  backports.shutil-get-terminal-size==1.0.0 requires backports.shutil-get-terminal-size==1.0.0
  decorator==4.3.0          requires decorator==4.3.0
  pygments==2.2.0           requires pygments==2.2.0
  ptyprocess==0.6.0         requires ptyprocess==0.6.0
  ipython-genutils==0.2.0   requires ipython-genutils==0.2.0
  appnope==0.1.0            requires appnope==0.1.0
  prompt-toolkit==1.0.15    requires prompt-toolkit==1.0.15, six>=1.9.0, wcwidth
  pexpect==4.6.0            requires pexpect==4.6.0, ptyprocess>=0.5
  simplegeneric==0.8.1      requires simplegeneric==0.8.1
  traitlets==4.3.2          requires decorator, enum34; python_version == "2.7", ipython-genutils, six, traitlets==4.3.2
  enum34==1.1.6             requires enum34==1.1.6
  wcwidth==0.1.7            requires wcwidth==0.1.7
  six==1.11.0               requires six==1.11.0
  ipython==5.8.0            requires appnope; sys_platform == "darwin", backports.shutil-get-terminal-size; python_version == "2.7", decorator, enum34; python_version == "2.7", ipython-genutils, ipython==5.8.0, pathlib2; python_version == "2.7" or python_version == "3.3", pexpect; sys_platform != "win32", pickleshare, prompt-toolkit<2.0.0,>=1.0.4, ptyprocess>=0.5, pygments, scandir; python_version < "3.5", setuptools>=18.5, simplegeneric>0.8, six>=1.9.0, traitlets>=4.2, wcwidth
  scandir==1.9.0            requires scandir==1.9.0
  pathlib2==2.3.2           requires pathlib2==2.3.2, scandir; python_version < "3.5", six

New dependencies found in this round:
  adding [u'appnope', '==0.1.0', '[]']
  adding [u'backports.shutil-get-terminal-size', '==1.0.0', '[]']
  adding [u'decorator', '==4.3.0', '[]']
  adding [u'enum34', '==1.1.6', '[]']
  adding [u'ipython-genutils', '==0.2.0', '[]']
  adding [u'pathlib2', '==2.3.2', '[]']
  adding [u'pexpect', '==4.6.0', '[]']
  adding [u'pickleshare', '==0.7.5', '[]']
  adding [u'prompt-toolkit', '<2.0.0,==1.0.15,>=1.0.4', '[]']
  adding [u'ptyprocess', '==0.6.0,>=0.5', '[]']
  adding [u'pygments', '==2.2.0', '[]']
  adding [u'scandir', '==1.9.0', '[]']
  adding [u'simplegeneric', '==0.8.1,>0.8', '[]']
  adding [u'six', '==1.11.0,>=1.9.0', '[]']
  adding [u'traitlets', '==4.3.2,>=4.2', '[]']
  adding [u'wcwidth', '==0.1.7', '[]']
Removed dependencies in this round:
  removing [u'appnope', '', '[]']
  removing [u'backports.shutil-get-terminal-size', '', '[]']
  removing [u'decorator', '', '[]']
  removing [u'enum34', '', '[]']
  removing [u'ipython-genutils', '', '[]']
  removing [u'pathlib2', '', '[]']
  removing [u'pexpect', '', '[]']
  removing [u'pickleshare', '', '[]']
  removing [u'prompt-toolkit', '<2.0.0,>=1.0.4', '[]']
  removing [u'ptyprocess', '>=0.5', '[]']
  removing [u'pygments', '', '[]']
  removing [u'scandir', '', '[]']
  removing [u'simplegeneric', '>0.8', '[]']
  removing [u'six', '>=1.9.0', '[]']
  removing [u'traitlets', '>=4.2', '[]']
  removing [u'wcwidth', '', '[]']
Unsafe dependencies in this round:
------------------------------------------------------------
Result of round 2: not stable

                          ROUND 3                           
Current constraints:
  appnope==0.1.0
  backports.shutil-get-terminal-size==1.0.0
  decorator==4.3.0
  enum34==1.1.6
  ipython==5.8.0 (from -r /var/folders/g9/pytwf10x5y58h92hx7x70qnh000105/T/pipenv-QdaxJp-requirements/pipenv-rV2j1p-constraints.txt (line 2))
  ipython-genutils==0.2.0
  pathlib2==2.3.2
  pexpect==4.6.0
  pickleshare==0.7.5
  prompt-toolkit<2.0.0,==1.0.15,>=1.0.4
  ptyprocess==0.6.0,>=0.5
  pygments==2.2.0
  scandir==1.9.0
  simplegeneric==0.8.1,>0.8
  six==1.11.0,>=1.9.0
  traitlets==4.3.2,>=4.2
  wcwidth==0.1.7

Finding the best candidates:
  found candidate appnope==0.1.0 (constraint was ==0.1.0)
  found candidate backports.shutil-get-terminal-size==1.0.0 (constraint was ==1.0.0)
  found candidate decorator==4.3.0 (constraint was ==4.3.0)
  found candidate enum34==1.1.6 (constraint was ==1.1.6)
  found candidate ipython==5.8.0 (constraint was ==5.8.0)
  found candidate ipython-genutils==0.2.0 (constraint was ==0.2.0)
  found candidate pathlib2==2.3.2 (constraint was ==2.3.2)
  found candidate pexpect==4.6.0 (constraint was ==4.6.0)
  found candidate pickleshare==0.7.5 (constraint was ==0.7.5)
  found candidate prompt-toolkit==1.0.15 (constraint was ==1.0.15,>=1.0.4,<2.0.0)
  found candidate ptyprocess==0.6.0 (constraint was >=0.5,==0.6.0)
  found candidate pygments==2.2.0 (constraint was ==2.2.0)
  found candidate scandir==1.9.0 (constraint was ==1.9.0)
  found candidate simplegeneric==0.8.1 (constraint was >0.8,==0.8.1)
  found candidate six==1.11.0 (constraint was ==1.11.0,>=1.9.0)
  found candidate traitlets==4.3.2 (constraint was >=4.2,==4.3.2)
  found candidate wcwidth==0.1.7 (constraint was ==0.1.7)

Finding secondary dependencies:
  pygments==2.2.0           requires pygments==2.2.0
  wcwidth==0.1.7            requires wcwidth==0.1.7
  pathlib2==2.3.2           requires pathlib2==2.3.2, scandir; python_version < "3.5", six
  prompt-toolkit==1.0.15    requires prompt-toolkit==1.0.15, six>=1.9.0, wcwidth
  backports.shutil-get-terminal-size==1.0.0 requires backports.shutil-get-terminal-size==1.0.0
  ptyprocess==0.6.0         requires ptyprocess==0.6.0
  simplegeneric==0.8.1      requires simplegeneric==0.8.1
  appnope==0.1.0            requires appnope==0.1.0
  enum34==1.1.6             requires enum34==1.1.6
  decorator==4.3.0          requires decorator==4.3.0
  six==1.11.0               requires six==1.11.0
  ipython==5.8.0            requires appnope; sys_platform == "darwin", backports.shutil-get-terminal-size; python_version == "2.7", decorator, enum34; python_version == "2.7", ipython-genutils, ipython==5.8.0, pathlib2; python_version == "2.7" or python_version == "3.3", pexpect; sys_platform != "win32", pickleshare, prompt-toolkit<2.0.0,>=1.0.4, ptyprocess>=0.5, pygments, scandir; python_version < "3.5", setuptools>=18.5, simplegeneric>0.8, six>=1.9.0, traitlets>=4.2, wcwidth
  pexpect==4.6.0            requires pexpect==4.6.0, ptyprocess>=0.5
  traitlets==4.3.2          requires decorator, enum34; python_version == "2.7", ipython-genutils, six, traitlets==4.3.2
  scandir==1.9.0            requires scandir==1.9.0
  ipython-genutils==0.2.0   requires ipython-genutils==0.2.0
  pickleshare==0.7.5        requires pathlib2; python_version in "2.6 2.7 3.2 3.3", pickleshare==0.7.5, scandir; python_version < "3.5", six
------------------------------------------------------------
Result of round 3: stable, done

Updated Pipfile.lock (e4cc43)!

$ cat Pipfile.lock | grep -B4 pathlib
        "pathlib2": {
            "hashes": [
                "sha256:8eb170f8d0d61825e09a95b38be068299ddeda82f35e96c3301a8a5e7604cb83",
                "sha256:d1aa2a11ba7b8f7b21ab852b1fb5afb277e1bb99d5dfc663380b5015c0d80c5a"
            ],
            "markers": "python_version in '2.6 2.7 3.2 3.3'",
            "version": "==2.3.2"
        },

Now, after running pipenv install, ipython works.

---

$ pipenv --support

Pipenv version: '2018.7.1'

Pipenv location: '/usr/local/lib/python2.7/site-packages/pipenv'

Python location: '/usr/local/opt/python@2/bin/python2.7'

Other Python installations in PATH:

• 2.7: /usr/local/bin/python2.7

• 2.7: /usr/local/bin/python2.7

• 2.7: /usr/bin/python2.7

• 2.7: /usr/local/bin/python2.7

• 3.6: /usr/local/bin/python3.6m

• 3.6: /usr/local/bin/python3.6

• 3.6: /usr/local/bin/python3.6

• 2.7.14: /usr/local/bin/python

• 2.7.10: /usr/bin/python

• 2.7.14: /usr/local/bin/python

• 2.7.14: /usr/local/bin/python2

• 2.7.14: /usr/local/bin/python2

• 3.6.5: /usr/local/bin/python3

• 3.6.5: /usr/local/bin/python3

PEP 508 Information:

{'implementation_name': 'cpython',
 'implementation_version': '0',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '17.7.0',
 'platform_system': 'Darwin',
 'platform_version': 'Darwin Kernel Version 17.7.0: Thu Jun 21 22:53:14 PDT 2018; root:xnu-4570.71.2~1/RELEASE_X86_64',
 'python_full_version': '2.7.14',
 'python_version': '2.7',
 'sys_platform': 'darwin'}

System environment variables:

• _
• TERM_PROGRAM_VERSION
• LOGNAME
• USER
• PATH
• HOME
• DISPLAY
• TERM_PROGRAM
• LANG
• __CF_USER_TEXT_ENCODING
• TERM
• Apple_PubSub_Socket_Render
• SHLVL
• SECURITYSESSIONID
• XPC_FLAGS
• EDITOR
• FIGNORE
• TERM_SESSION_ID
• XPC_SERVICE_NAME
• SSH_AUTH_SOCK
• VISUAL
• SHELL
• PYTHONDONTWRITEBYTECODE
• PIP_PYTHON_PATH
• TMPDIR
• LSCOLORS
• PYTHONSTARTUP
• OLDPWD
• CLICOLOR
• HISTCONTROL
• PWD

Pipenv–specific environment variables:

Debug–specific environment variables:

• PATH: /usr/local/bin:/usr/local/sbin:/Users/user/.bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/texbin:/opt/X11/bin
• SHELL: /bin/bash
• EDITOR: nvim
• LANG: en_US.UTF-8
• PWD: /Users/user/loki/test

---

Contents of Pipfile ('/Users/user/loki/test/Pipfile'):

[[source]]
url = "https://pypi.org/simple"
verify_ssl = true
name = "pypi"

[dev-packages]

[packages]
ipython = "*"

[requires]
python_version = "2.7"

Contents of Pipfile.lock ('/Users/user/loki/test/Pipfile.lock'):

{
    "_meta": {
        "hash": {
            "sha256": "bd21cf36543e0331955e6f1443bc021c6e4cc23e157f5b6a1a29bdf9147152c9"
        },
        "pipfile-spec": 6,
        "requires": {
            "python_version": "2"
        },
        "sources": [
            {
                "name": "pypi",
                "url": "https://pypi.org/simple",
                "verify_ssl": true
            }
        ]
    },
    "default": {
        "appnope": {
            "hashes": [
                "sha256:5b26757dc6f79a3b7dc9fab95359328d5747fcb2409d331ea66d0272b90ab2a0",
                "sha256:8b995ffe925347a2138d7ac0fe77155e4311a0ea6d6da4f5128fe4b3cbe5ed71"
            ],
            "markers": "sys_platform == 'darwin'",
            "version": "==0.1.0"
        },
        "backports.shutil-get-terminal-size": {
            "hashes": [
                "sha256:0975ba55054c15e346944b38956a4c9cbee9009391e41b86c68990effb8c1f64",
                "sha256:713e7a8228ae80341c70586d1cc0a8caa5207346927e23d09dcbcaf18eadec80"
            ],
            "markers": "python_version == '2.7'",
            "version": "==1.0.0"
        },
        "decorator": {
            "hashes": [
                "sha256:2c51dff8ef3c447388fe5e4453d24a2bf128d3a4c32af3fabef1f01c6851ab82",
                "sha256:c39efa13fbdeb4506c476c9b3babf6a718da943dab7811c206005a4a956c080c"
            ],
            "version": "==4.3.0"
        },
        "enum34": {
            "hashes": [
                "sha256:2d81cbbe0e73112bdfe6ef8576f2238f2ba27dd0d55752a776c41d38b7da2850",
                "sha256:644837f692e5f550741432dd3f223bbb9852018674981b1664e5dc339387588a",
                "sha256:6bd0f6ad48ec2aa117d3d141940d484deccda84d4fcd884f5c3d93c23ecd8c79",
                "sha256:8ad8c4783bf61ded74527bffb48ed9b54166685e4230386a9ed9b1279e2df5b1"
            ],
            "markers": "python_version == '2.7'",
            "version": "==1.1.6"
        },
        "ipython": {
            "hashes": [
                "sha256:0371b7e4bd74954a35086eac949beeac5b1c9f5ce231e2e77df2286a293765e3",
                "sha256:37101b8cbe072fe17bff100bc03d096404e4a9a0357097aeb5b61677c042cab1",
                "sha256:4bac649857611baaaf76bc82c173aa542f7486446c335fe1a6c05d0d491c8906"
            ],
            "index": "pypi",
            "version": "==5.8.0"
        },
        "ipython-genutils": {
            "hashes": [
                "sha256:72dd37233799e619666c9f639a9da83c34013a73e8bbc79a7a6348d93c61fab8",
                "sha256:eb2e116e75ecef9d4d228fdc66af54269afa26ab4463042e33785b887c628ba8"
            ],
            "version": "==0.2.0"
        },
        "pathlib2": {
            "hashes": [
                "sha256:8eb170f8d0d61825e09a95b38be068299ddeda82f35e96c3301a8a5e7604cb83",
                "sha256:d1aa2a11ba7b8f7b21ab852b1fb5afb277e1bb99d5dfc663380b5015c0d80c5a"
            ],
            "markers": "python_version in '2.6 2.7 3.2 3.3'",
            "version": "==2.3.2"
        },
        "pexpect": {
            "hashes": [
                "sha256:2a8e88259839571d1251d278476f3eec5db26deb73a70be5ed5dc5435e418aba",
                "sha256:3fbd41d4caf27fa4a377bfd16fef87271099463e6fa73e92a52f92dfee5d425b"
            ],
            "markers": "sys_platform != 'win32'",
            "version": "==4.6.0"
        },
        "pickleshare": {
            "hashes": [
                "sha256:87683d47965c1da65cdacaf31c8441d12b8044cdec9aca500cd78fc2c683afca",
                "sha256:9649af414d74d4df115d5d718f82acb59c9d418196b7b4290ed47a12ce62df56"
            ],
            "version": "==0.7.5"
        },
        "prompt-toolkit": {
            "hashes": [
                "sha256:1df952620eccb399c53ebb359cc7d9a8d3a9538cb34c5a1344bdbeb29fbcc381",
                "sha256:3f473ae040ddaa52b52f97f6b4a493cfa9f5920c255a12dc56a7d34397a398a4",
                "sha256:858588f1983ca497f1cf4ffde01d978a3ea02b01c8a26a8bbc5cd2e66d816917"
            ],
            "version": "==1.0.15"
        },
        "ptyprocess": {
            "hashes": [
                "sha256:923f299cc5ad920c68f2bc0bc98b75b9f838b93b599941a6b63ddbc2476394c0",
                "sha256:d7cc528d76e76342423ca640335bd3633420dc1366f258cb31d05e865ef5ca1f"
            ],
            "version": "==0.6.0"
        },
        "pygments": {
            "hashes": [
                "sha256:78f3f434bcc5d6ee09020f92ba487f95ba50f1e3ef83ae96b9d5ffa1bab25c5d",
                "sha256:dbae1046def0efb574852fab9e90209b23f556367b5a320c0bcb871c77c3e8cc"
            ],
            "version": "==2.2.0"
        },
        "scandir": {
            "hashes": [
                "sha256:04b8adb105f2ed313a7c2ef0f1cf7aff4871aa7a1883fa4d8c44b5551ab052d6",
                "sha256:1444134990356c81d12f30e4b311379acfbbcd03e0bab591de2696a3b126d58e",
                "sha256:1b5c314e39f596875e5a95dd81af03730b338c277c54a454226978d5ba95dbb6",
                "sha256:346619f72eb0ddc4cf355ceffd225fa52506c92a2ff05318cfabd02a144e7c4e",
                "sha256:44975e209c4827fc18a3486f257154d34ec6eaec0f90fef0cca1caa482db7064",
                "sha256:61859fd7e40b8c71e609c202db5b0c1dbec0d5c7f1449dec2245575bdc866792",
                "sha256:a5e232a0bf188362fa00123cc0bb842d363a292de7126126df5527b6a369586a",
                "sha256:c14701409f311e7a9b7ec8e337f0815baf7ac95776cc78b419a1e6d49889a383",
                "sha256:c7708f29d843fc2764310732e41f0ce27feadde453261859ec0fca7865dfc41b",
                "sha256:c9009c527929f6e25604aec39b0a43c3f831d2947d89d6caaab22f057b7055c8",
                "sha256:f5c71e29b4e2af7ccdc03a020c626ede51da471173b4a6ad1e904f2b2e04b4bd"
            ],
            "markers": "python_version < '3.5'",
            "version": "==1.9.0"
        },
        "simplegeneric": {
            "hashes": [
                "sha256:dc972e06094b9af5b855b3df4a646395e43d1c9d0d39ed345b7393560d0b9173"
            ],
            "version": "==0.8.1"
        },
        "six": {
            "hashes": [
                "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9",
                "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb"
            ],
            "version": "==1.11.0"
        },
        "traitlets": {
            "hashes": [
                "sha256:9c4bd2d267b7153df9152698efb1050a5d84982d3384a37b2c1f7723ba3e7835",
                "sha256:c6cb5e6f57c5a9bdaa40fa71ce7b4af30298fbab9ece9815b5d995ab6217c7d9"
            ],
            "version": "==4.3.2"
        },
        "wcwidth": {
            "hashes": [
                "sha256:3df37372226d6e63e1b1e1eda15c594bca98a22d33a23832a90998faa96bc65e",
                "sha256:f4ebe71925af7b40a864553f761ed559b43544f8f71746c2d756c7fe788ade7c"
            ],
            "version": "==0.1.7"
        }
    },
    "develop": {}
}

[Jamim]

This issue is a duplicate of #2662.

[techalchemy]

Markers are sometimes parsed nondeterministically, in most cases (all cases that I've seen) it is not meaningful but it does create a lot of clutter in version control. We will fix this when we get better at set math.

Sorry for the annoyance

[scott-vsi]

FYI this is a case where it matters. iPython will not install on the first pass. You must run pipenv install twice. The first time it errors with the output listed above.

[techalchemy]

@scott-vsi I believe that is an artifact of a bug in the resolver implementation which causes it to be nondeterministic -- that will be fixed in the coming release (next few hrs)

[scott-vsi]

Great. Thanks!