Bug in generating output in requirements.txt format

[palnabarun]

Issue description

I am trying to create a requirements.txt for the Pipfile that is provided below. The output contains one requirement in the form web-py==0.40dev0 which should have been web.py==0.40dev0. This issue cropped up after upgrading to the latest version of pipenv [2018.10.9], details of which are given below.

Due to this, pip install is failing as no package with the name web-py==0.40dev0 exists.

Expected result

The pip install -r requirements.txt step below should have worked flawlessly. At least, it did with pipenv 2018.7.1

Actual result

The pip install -r requirements.txt fails due to a non-existent package name.

Steps to replicate

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

[packages]
"web.py" = "==0.40dev0"
"psycopg2-binary" = "*"
dj-database-url = "*"
gunicorn = "*"

[dev-packages]
pytest = "*"
pytest-flakes = "*"
mypy = "*"
pyflakes = "*"

[requires]
python_version = "3.6"

$ pipenv lock -r > requirements.txt
$ cat requirements.txt
-i https://pypi.org/simple
dj-database-url==0.5.0
gunicorn==19.9.0
psycopg2-binary==2.7.5
web-py==0.40.dev0

$ pip install -r requirements.txt
Collecting dj-database-url==0.5.0 (from -r r.txt (line 2))
  Using cached https://files.pythonhosted.org/packages/d4/a6/4b8578c1848690d0c307c7c0596af2077536c9ef2a04d42b00fabaa7e49d/dj_database_url-0.5.0-py2.py3-none-any.whl
Collecting gunicorn==19.9.0 (from -r r.txt (line 3))
  Using cached https://files.pythonhosted.org/packages/8c/da/b8dd8deb741bff556db53902d4706774c8e1e67265f69528c14c003644e6/gunicorn-19.9.0-py2.py3-none-any.whl
Collecting psycopg2-binary==2.7.5 (from -r r.txt (line 4))
  Using cached https://files.pythonhosted.org/packages/4b/8c/0f7ae152fee5ec23000539ba583224213f5d08b338a3178c503409a72435/psycopg2_binary-2.7.5-cp37-cp37m-manylinux1_x86_64.whl
Collecting web-py==0.40.dev0 (from -r r.txt (line 5))
  Could not find a version that satisfies the requirement web-py==0.40.dev0 (from -r r.txt (line 5)) (from versions: )
No matching distribution found for web-py==0.40.dev0 (from -r r.txt (line 5))

---

$ pipenv --support

Pipenv version: '2018.10.9'

Pipenv location: '/home/nabarun/.local/lib/python3.7/site-packages/pipenv'

Python location: '/usr/bin/python'

Python installations found:

• 3.7.0: /usr/bin/python3.7
• 3.7.0: /usr/bin/python3.7m
• 3.6.6: /home/nabarun/.envs/hyron-server-Wm2ZsfEu/bin/python3.6m
• 3.6.6: /usr/bin/python3.6m
• 3.6.6: /usr/bin/python3.6

PEP 508 Information:

{'implementation_name': 'cpython',
 'implementation_version': '3.7.0',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '4.14.69-1-MANJARO',
 'platform_system': 'Linux',
 'platform_version': '#1 SMP PREEMPT Mon Sep 10 02:18:25 UTC 2018',
 'python_full_version': '3.7.0',
 'python_version': '3.7',
 'sys_platform': 'linux'}

System environment variables:

• XDG_SEAT_PATH
• USER
• LC_TELEPHONE
• LANG
• DISPLAY
• SHLVL
• LOGNAME
• XDG_VTNR
• LC_NAME
• PWD
• MOZ_PLUGIN_PATH
• XAUTHORITY
• XDG_GREETER_DATA_DIR
• QT_QPA_PLATFORMTHEME
• COLORTERM
• XDG_SESSION_ID
• GTK2_RC_FILES
• GNOME_TERMINAL_SCREEN
• DESKTOP_SESSION
• XDG_SESSION_DESKTOP
• GDMSESSION
• LC_NUMERIC
• LC_MEASUREMENT
• LC_PAPER
• LC_IDENTIFICATION
• LC_MONETARY
• DBUS_SESSION_BUS_ADDRESS
• VTE_VERSION
• MAIL
• _
• XDG_DATA_DIRS
• GNOME_TERMINAL_SERVICE
• SHELL
• XDG_SESSION_TYPE
• LC_TIME
• TERM
• GTK_MODULES
• XDG_CURRENT_DESKTOP
• EDITOR
• PATH
• HOME
• BROWSER
• XDG_RUNTIME_DIR
• LC_ADDRESS
• XDG_SESSION_PATH
• XDG_SEAT
• OLDPWD
• ZSH
• PAGER
• LESS
• LC_CTYPE
• LSCOLORS
• LS_COLORS
• WORKON_HOME
• VIRTUALENVWRAPPER_PROJECT_FILENAME
• VIRTUALENVWRAPPER_WORKON_CD
• VIRTUALENVWRAPPER_SCRIPT
• VIRTUALENVWRAPPER_HOOK_DIR
• VAULT_ADDR
• GOPATH
• NVM_DIR
• NVM_CD_FLAGS
• NVM_BIN
• PYTHONDONTWRITEBYTECODE
• PIP_SHIMS_BASE_MODULE
• PIP_PYTHON_PATH
• PIPENV_ACTIVE
• VIRTUAL_ENV
• PS1

Pipenv–specific environment variables:

• PIPENV_ACTIVE: 1

Debug–specific environment variables:

• PATH: /home/nabarun/.envs/hyron-server-Wm2ZsfEu/bin:/home/nabarun/.nvm/versions/node/v8.12.0/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl:/home/nabarun/.local/bin:/home/nabarun/.local/go/bin:/home/nabarun/go/bin
• SHELL: /usr/bin/zsh
• EDITOR: /usr/bin/nano
• LANG: en_US.UTF-8
• PWD: /home/nabarun/c/rorodata/hyron-server
• VIRTUAL_ENV: /home/nabarun/.envs/hyron-server-Wm2ZsfEu

---

Contents of Pipfile ('/home/nabarun/c/rorodata/hyron-server/Pipfile'):

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

[packages]
"web.py" = "==0.40dev0"
"psycopg2-binary" = "*"
dj-database-url = "*"
gunicorn = "*"

[dev-packages]
pytest = "*"
pytest-flakes = "*"
mypy = "*"
pyflakes = "*"

[requires]
python_version = "3.6"

Contents of Pipfile.lock ('/home/nabarun/c/rorodata/hyron-server/Pipfile.lock'):

{
    "_meta": {
        "hash": {
            "sha256": "4f2cd51d6857eee7eb13efe2240f51a88223edf90fc7b375c3297750ae8b1bf8"
        },
        "pipfile-spec": 6,
        "requires": {
            "python_version": "3.6"
        },
        "sources": [
            {
                "name": "pypi",
                "url": "https://pypi.org/simple",
                "verify_ssl": true
            }
        ]
    },
    "default": {
        "dj-database-url": {
            "hashes": [
                "sha256:4aeaeb1f573c74835b0686a2b46b85990571159ffc21aa57ecd4d1e1cb334163",
                "sha256:851785365761ebe4994a921b433062309eb882fedd318e1b0fcecc607ed02da9"
            ],
            "index": "pypi",
            "version": "==0.5.0"
        },
        "gunicorn": {
            "hashes": [
                "sha256:aa8e0b40b4157b36a5df5e599f45c9c76d6af43845ba3b3b0efe2c70473c2471",
                "sha256:fa2662097c66f920f53f70621c6c58ca4a3c4d3434205e608e121b5b3b71f4f3"
            ],
            "index": "pypi",
            "version": "==19.9.0"
        },
        "psycopg2-binary": {
            "hashes": [
                "sha256:04afb59bbbd2eab3148e6816beddc74348078b8c02a1113ea7f7822f5be4afe3",
                "sha256:098b18f4d8857a8f9b206d1dc54db56c2255d5d26458917e7bcad61ebfe4338f",
                "sha256:0bf855d4a7083e20ead961fda4923887094eaeace0ab2d76eb4aa300f4bbf5bd",
                "sha256:197dda3ffd02057820be83fe4d84529ea70bf39a9a4daee1d20ffc74eb3d042e",
                "sha256:278ef63afb4b3d842b4609f2c05ffbfb76795cf6a184deeb8707cd5ed3c981a5",
                "sha256:3cbf8c4fc8f22f0817220891cf405831559f4d4c12c4f73913730a2ea6c47a47",
                "sha256:4305aed922c4d9d6163ab3a41d80b5a1cfab54917467da8168552c42cad84d32",
                "sha256:47ee296f704fb8b2a616dec691cdcfd5fa0f11943955e88faa98cbd1dc3b3e3d",
                "sha256:4a0e38cb30457e70580903367161173d4a7d1381eb2f2cfe4e69b7806623f484",
                "sha256:4d6c294c6638a71cafb82a37f182f24321f1163b08b5d5ca076e11fe838a3086",
                "sha256:4f3233c366500730f839f92833194fd8f9a5c4529c8cd8040aa162c3740de8e5",
                "sha256:5221f5a3f4ca2ddf0d58e8b8a32ca50948be9a43351fda797eb4e72d7a7aa34d",
                "sha256:5c6ca0b507540a11eaf9e77dee4f07c131c2ec80ca0cffa146671bf690bc1c02",
                "sha256:789bd89d71d704db2b3d5e67d6d518b158985d791d3b2dec5ab85457cfc9677b",
                "sha256:7b94d29239efeaa6a967f3b5971bd0518d2a24edd1511edbf4a2c8b815220d07",
                "sha256:89bc65ef3301c74cf32db25334421ea6adbe8f65601ea45dcaaf095abed910bb",
                "sha256:89d6d3a549f405c20c9ae4dc94d7ed2de2fa77427a470674490a622070732e62",
                "sha256:97521704ac7127d7d8ba22877da3c7bf4a40366587d238ec679ff38e33177498",
                "sha256:a395b62d5f44ff6f633231abe568e2203b8fabf9797cd6386aa92497df912d9a",
                "sha256:a6d32c37f714c3f34158f3fa659f3a8f2658d5f53c4297d45579b9677cc4d852",
                "sha256:a89ee5c26f72f2d0d74b991ce49e42ddeb4ac0dc2d8c06a0f2770a1ab48f4fe0",
                "sha256:b4c8b0ef3608e59317bfc501df84a61e48b5445d45f24d0391a24802de5f2d84",
                "sha256:b5fcf07140219a1f71e18486b8dc28e2e1b76a441c19374805c617aa6d9a9d55",
                "sha256:b86f527f00956ecebad6ab3bb30e3a75fedf1160a8716978dd8ce7adddedd86f",
                "sha256:be4c4aa22ba22f70de36c98b06480e2f1697972d49eb20d525f400d204a6d272",
                "sha256:c2ac7aa1a144d4e0e613ac7286dae85671e99fe7a1353954d4905629c36b811c",
                "sha256:de26ef4787b5e778e8223913a3e50368b44e7480f83c76df1f51d23bd21cea16",
                "sha256:e70ebcfc5372dc7b699c0110454fc4263967f30c55454397e5769eb72c0eb0ce",
                "sha256:eadbd32b6bc48b67b0457fccc94c86f7ccc8178ab839f684eb285bb592dc143e",
                "sha256:ecbc6dfff6db06b8b72ae8a2f25ff20fbdcb83cb543811a08f7cb555042aa729"
            ],
            "index": "pypi",
            "version": "==2.7.5"
        },
        "web.py": {
            "hashes": [
                "sha256:d464fa8d7cdd90c3a8a163b1b5e8e55b856cca4d13a9938e3a7920a3090b69a3"
            ],
            "index": "pypi",
            "version": "==0.40.dev0"
        }
    },
    "develop": {
        "atomicwrites": {
            "hashes": [
                "sha256:0312ad34fcad8fac3704d441f7b317e50af620823353ec657a53e981f92920c0",
                "sha256:ec9ae8adaae229e4f8446952d204a3e4b5fdd2d099f9be3aaf556120135fb3ee"
            ],
            "markers": "python_version != '3.0.*' and python_version != '3.2.*' and python_version >= '2.7' and python_version != '3.1.*' and python_version != '3.3.*'",
            "version": "==1.2.1"
        },
        "attrs": {
            "hashes": [
                "sha256:10cbf6e27dbce8c30807caf056c8eb50917e0eaafe86347671b57254006c3e69",
                "sha256:ca4be454458f9dec299268d472aaa5a11f67a4ff70093396e1ceae9c76cf4bbb"
            ],
            "version": "==18.2.0"
        },
        "more-itertools": {
            "hashes": [
                "sha256:c187a73da93e7a8acc0001572aebc7e3c69daf7bf6881a2cea10650bd4420092",
                "sha256:c476b5d3a34e12d40130bc2f935028b5f636df8f372dc2c1c01dc19681b2039e",
                "sha256:fcbfeaea0be121980e15bc97b3817b5202ca73d0eae185b4550cbfce2a3ebb3d"
            ],
            "version": "==4.3.0"
        },
        "mypy": {
            "hashes": [
                "sha256:00b95bfdc0d5b9aa53c906e56fb91937743f2121d66684db5f947ec5d75f565d",
                "sha256:6704586b4c2bf7dfa5e87a422be9ca57db622bab65008245759f3d4baeb219dd"
            ],
            "index": "pypi",
            "version": "==0.630"
        },
        "mypy-extensions": {
            "hashes": [
                "sha256:37e0e956f41369209a3d5f34580150bcacfabaa57b33a15c0b25f4b5725e0812",
                "sha256:b16cabe759f55e3409a7d231ebd2841378fb0c27a5d1994719e340e4f429ac3e"
            ],
            "version": "==0.4.1"
        },
        "pluggy": {
            "hashes": [
                "sha256:6e3836e39f4d36ae72840833db137f7b7d35105079aee6ec4a62d9f80d594dd1",
                "sha256:95eb8364a4708392bae89035f45341871286a333f749c3141c20573d2b3876e1"
            ],
            "markers": "python_version != '3.0.*' and python_version != '3.2.*' and python_version >= '2.7' and python_version != '3.1.*' and python_version != '3.3.*'",
            "version": "==0.7.1"
        },
        "py": {
            "hashes": [
                "sha256:06a30435d058473046be836d3fc4f27167fd84c45b99704f2fb5509ef61f9af1",
                "sha256:50402e9d1c9005d759426988a492e0edaadb7f4e68bcddfea586bc7432d009c6"
            ],
            "markers": "python_version != '3.0.*' and python_version != '3.2.*' and python_version >= '2.7' and python_version != '3.1.*' and python_version != '3.3.*'",
            "version": "==1.6.0"
        },
        "pyflakes": {
            "hashes": [
                "sha256:9a7662ec724d0120012f6e29d6248ae3727d821bba522a0e6b356eff19126a49",
                "sha256:f661252913bc1dbe7fcfcbf0af0db3f42ab65aabd1a6ca68fe5d466bace94dae"
            ],
            "index": "pypi",
            "version": "==2.0.0"
        },
        "pytest": {
            "hashes": [
                "sha256:7e258ee50338f4e46957f9e09a0f10fb1c2d05493fa901d113a8dafd0790de4e",
                "sha256:9332147e9af2dcf46cd7ceb14d5acadb6564744ddff1fe8c17f0ce60ece7d9a2"
            ],
            "index": "pypi",
            "version": "==3.8.2"
        },
        "pytest-flakes": {
            "hashes": [
                "sha256:341964bf5760ebbdde9619f68a17d5632c674c3f6903ef66daa0a4f540b3d143",
                "sha256:daaf319250eeefa8cb13b0ba78ffdda67926c4b6446a9e14f946b86d1ba6af23"
            ],
            "index": "pypi",
            "version": "==4.0.0"
        },
        "six": {
            "hashes": [
                "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9",
                "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb"
            ],
            "version": "==1.11.0"
        },
        "typed-ast": {
            "hashes": [
                "sha256:0948004fa228ae071054f5208840a1e88747a357ec1101c17217bfe99b299d58",
                "sha256:10703d3cec8dcd9eef5a630a04056bbc898abc19bac5691612acba7d1325b66d",
                "sha256:1f6c4bd0bdc0f14246fd41262df7dfc018d65bb05f6e16390b7ea26ca454a291",
                "sha256:25d8feefe27eb0303b73545416b13d108c6067b846b543738a25ff304824ed9a",
                "sha256:29464a177d56e4e055b5f7b629935af7f49c196be47528cc94e0a7bf83fbc2b9",
                "sha256:2e214b72168ea0275efd6c884b114ab42e316de3ffa125b267e732ed2abda892",
                "sha256:3e0d5e48e3a23e9a4d1a9f698e32a542a4a288c871d33ed8df1b092a40f3a0f9",
                "sha256:519425deca5c2b2bdac49f77b2c5625781abbaf9a809d727d3a5596b30bb4ded",
                "sha256:57fe287f0cdd9ceaf69e7b71a2e94a24b5d268b35df251a88fef5cc241bf73aa",
                "sha256:668d0cec391d9aed1c6a388b0d5b97cd22e6073eaa5fbaa6d2946603b4871efe",
                "sha256:68ba70684990f59497680ff90d18e756a47bf4863c604098f10de9716b2c0bdd",
                "sha256:6de012d2b166fe7a4cdf505eee3aaa12192f7ba365beeefaca4ec10e31241a85",
                "sha256:79b91ebe5a28d349b6d0d323023350133e927b4de5b651a8aa2db69c761420c6",
                "sha256:8550177fa5d4c1f09b5e5f524411c44633c80ec69b24e0e98906dd761941ca46",
                "sha256:898f818399cafcdb93cbbe15fc83a33d05f18e29fb498ddc09b0214cdfc7cd51",
                "sha256:94b091dc0f19291adcb279a108f5d38de2430411068b219f41b343c03b28fb1f",
                "sha256:a26863198902cda15ab4503991e8cf1ca874219e0118cbf07c126bce7c4db129",
                "sha256:a8034021801bc0440f2e027c354b4eafd95891b573e12ff0418dec385c76785c",
                "sha256:bc978ac17468fe868ee589c795d06777f75496b1ed576d308002c8a5756fb9ea",
                "sha256:c05b41bc1deade9f90ddc5d988fe506208019ebba9f2578c622516fd201f5863",
                "sha256:c9b060bd1e5a26ab6e8267fd46fc9e02b54eb15fffb16d112d4c7b1c12987559",
                "sha256:edb04bdd45bfd76c8292c4d9654568efaedf76fe78eb246dde69bdb13b2dad87",
                "sha256:f19f2a4f547505fe9072e15f6f4ae714af51b5a681a97f187971f50c283193b6"
            ],
            "version": "==1.1.0"
        }
    }
}