Pipenv lock -r > requirements.txt does not produce the correct requirements.txt

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-------------------------------------------------------------------------------

<details><summary>$ pipenv --support</summary>

Pipenv version: `'2018.10.13'`

Pipenv location: `'/usr/local/lib/python3.6/dist-packages/pipenv'`

Python location: `'/usr/bin/python3'`

Python installations found:

  - `3.6.8`: `/usr/bin/python3.6`
  - `3.6.8`: `/usr/bin/python3.6m`

PEP 508 Information:

```
{'implementation_name': 'cpython',
 'implementation_version': '3.6.8',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '4.9.184-linuxkit',
 'platform_system': 'Linux',
 'platform_version': '#1 SMP Tue Jul 2 22:58:16 UTC 2019',
 'python_full_version': '3.6.8',
 'python_version': '3.6',
 'sys_platform': 'linux'}
```

System environment variables:

  - `PYTHONUNBUFFERED`
  - `LC_ALL`
  - `LS_COLORS`
  - `LESSCLOSE`
  - `LANG`
  - `HOSTNAME`
  - `PWD`
  - `HOME`
  - `TERM`
  - `SHLVL`
  - `PATH`
  - `LESSOPEN`
  - `_`
  - `OLDPWD`
  - `PYTHONDONTWRITEBYTECODE`
  - `PIP_SHIMS_BASE_MODULE`
  - `PIP_PYTHON_PATH`

Pipenv–specific environment variables:


Debug–specific environment variables:

  - `PATH`: `/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin`
  - `LANG`: `C.UTF-8`
  - `PWD`: `/tmp`


---------------------------

Contents of `Pipfile` ('/tmp/Pipfile'):

```toml
[[source]]
name = "pypi"
url = "https://pypi.python.org/simple"
verify_ssl = true

[requires]
python_version = "3.6"

[packages]

[dev-packages]
black = "==19.3b0"
pytest-black = "*"
flake8 = "*"
isort = "*"
mypy = "*"
pre-commit = "*"
pytest = "*"
pytest-cov = "*"
safety = "*"
pycco = "*"

[pipenv]
allow_prereleases = true

```


Contents of `Pipfile.lock` ('/tmp/Pipfile.lock'):

```json
{
    "_meta": {
        "hash": {
            "sha256": "e7d45437393b79d07c5dfc44176a110006cad27c520f6fd2600ca3f5a1fd8b67"
        },
        "pipfile-spec": 6,
        "requires": {
            "python_version": "3.6"
        },
        "sources": [
            {
                "name": "pypi",
                "url": "https://pypi.python.org/simple",
                "verify_ssl": true
            }
        ]
    },
    "default": {},
    "develop": {
        "appdirs": {
            "hashes": [
                "sha256:9e5896d1372858f8dd3344faf4e5014d21849c756c8d5701f78f8a103b372d92",
                "sha256:d8b24664561d0d34ddfaec54636d502d7cea6e29c3eaf68f3df6180863e2166e"
            ],
            "version": "==1.4.3"
        },
        "aspy.yaml": {
            "hashes": [
                "sha256:463372c043f70160a9ec950c3f1e4c3a82db5fca01d334b6bc89c7164d744bdc",
                "sha256:e7c742382eff2caed61f87a39d13f99109088e5e93f04d76eb8d4b28aa143f45"
            ],
            "version": "==1.3.0"
        },
        "atomicwrites": {
            "hashes": [
                "sha256:03472c30eb2c5d1ba9227e4c2ca66ab8287fbfbbda3888aa93dc2e28fc6811b4",
                "sha256:75a9445bac02d8d058d5e1fe689654ba5a6556a1dfd8ce6ec55a0ed79866cfa6"
            ],
            "version": "==1.3.0"
        },
        "attrs": {
            "hashes": [
                "sha256:69c0dbf2ed392de1cb5ec704444b08a5ef81680a61cb899dc08127123af36a79",
                "sha256:f0b870f674851ecbfbbbd364d6b5cbdff9dcedbc7f3f5e18a6891057f21fe399"
            ],
            "version": "==19.1.0"
        },
        "black": {
            "hashes": [
                "sha256:09a9dcb7c46ed496a9850b76e4e825d6049ecd38b611f1224857a79bd985a8cf",
                "sha256:68950ffd4d9169716bcb8719a56c07a2f4485354fec061cdd5910aa07369731c"
            ],
            "index": "pypi",
            "version": "==19.3b0"
        },
        "certifi": {
            "hashes": [
                "sha256:046832c04d4e752f37383b628bc601a7ea7211496b4638f6514d0e5b9acc4939",
                "sha256:945e3ba63a0b9f577b1395204e13c3a231f9bc0223888be653286534e5873695"
            ],
            "version": "==2019.6.16"
        },
        "cfgv": {
            "hashes": [
                "sha256:edb387943b665bf9c434f717bf630fa78aecd53d5900d2e05da6ad6048553144",
                "sha256:fbd93c9ab0a523bf7daec408f3be2ed99a980e20b2d19b50fc184ca6b820d289"
            ],
            "version": "==2.0.1"
        },
        "chardet": {
            "hashes": [
                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae",
                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
            ],
            "version": "==3.0.4"
        },
        "click": {
            "hashes": [
                "sha256:2335065e6395b9e67ca716de5f7526736bfa6ceead690adf616d925bdc622b13",
                "sha256:5b94b49521f6456670fdb30cd82a4eca9412788a93fa6dd6df72c94d5a8ff2d7"
            ],
            "version": "==7.0"
        },
        "coverage": {
            "hashes": [
                "sha256:108efa19b676e62590a7a13084098e35183479c0d9608131c20b0921c5a72dc0",
                "sha256:16fe3ef881eff27bab287f91dadb4ff0ce4388b9e928d84cbf148a83cc70b3a1",
                "sha256:1d0bbc11421827d1100da82ac8dc929532b97ad464038475a0f6505cbf83d6ea",
                "sha256:23a8ca5b3c9673f775cc151e85a737f1a967df2ec02b09e8c5a3b606ff2050bf",
                "sha256:24b890e51455276762b55cb06fa1c922066e8fc18d1deb1a6399b4d24dfa8ea2",
                "sha256:2f0041757ca4801f3c6a74d1660862fdb18a25aea302dd0ce9b067ddbb06b667",
                "sha256:3169aba03baddfccdab7cc04cf0878dbf76fc06d300bc35639129a6b794d6484",
                "sha256:364fb1bf0f999af2e7f4b1a1e614b2af8c3e0017d11af716aad25f911b7cd0c7",
                "sha256:5256856d23f3e45959e7e3a8f9d4cbad3d1613e5660cb8117cd1417798efc395",
                "sha256:5b26daa1e1a1147455bf62cd682e504e68f1d1e04235374d50a5248a3c792b1c",
                "sha256:60247c8f0c756732e2cfe21f03e6847b923b9a9eaff61f04dc64d3047ec1b669",
                "sha256:6463d51507308eb3973340d903537f17ece2ee1e6513aa0c27548fc3a09b0471",
                "sha256:64cbadf7a884b299794238bc4391752130e74f71e919993b50c1c431786ef2a2",
                "sha256:6de85748ea39ce819ad6d90e660da43964457a1f5cd25262e962a7c7c87945b3",
                "sha256:6f95b4794bd84f64aeca25087d8e3abc416aad76842afcac34fa6c3a6f61c62e",
                "sha256:778fa184aa3079fa3cbd240e2f5b36771c3382db26bc7bf78aea9d06212c6c66",
                "sha256:790a9c5e2dbdf6c41eec9776ed663e99bd36c1604e3bf2e8ae3b123181bfee9f",
                "sha256:7d97c1aec0b68b4ea5e3c9edb9fc3f951e8a52360f4bad3aacab9a77defe5b17",
                "sha256:93cefddcc0b541d3c52981a232947bf085a38092b0812317f1adb56f02869bcb",
                "sha256:95e49867ac616ec63ecd69ea005e65e4b896a48b8db7f9f3ad69f37be29324b7",
                "sha256:aca423563eafba66a7c15125391b267befd1e45238de5e1a119ae1fb4ea83b5c",
                "sha256:baef7c35e7fce738d9637e9c7a6aa79cb79085e4de49c2ec517ce19239a660f6",
                "sha256:c10ccf0797ffce85e93a40aff3a96a3adb63c734f95b59384a7c9522ed25c9e2",
                "sha256:ca39704a05bba1886c384a4d7944fda72c53fe5e61979cd933d22084678ad4c1",
                "sha256:f6e96d5eee578187f5b7e9266bf646b73de29e2dd7adca8bd83e383680ce1f4c",
                "sha256:fc6524511fa664cb4e91401229eedd0dad4ba6ded9c4423fee2f698d78908d9c",
                "sha256:fdf2e7e5f074495ad6ea796ca0d245aa6a8b9e4c546ffbf8d30aaaee6601af0f"
            ],
            "version": "==5.0a6"
        },
        "dparse": {
            "hashes": [
                "sha256:00a5fdfa900629e5159bf3600d44905b333f4059a3366f28e0dbd13eeab17b19",
                "sha256:cef95156fa0adedaf042cd42f9990974bec76f25dfeca4dc01f381a243d5aa5b"
            ],
            "version": "==0.4.1"
        },
        "entrypoints": {
            "hashes": [
                "sha256:589f874b313739ad35be6e0cd7efde2a4e9b6fea91edcc34e58ecbb8dbe56d19",
                "sha256:c70dd71abe5a8c85e55e12c19bd91ccfeec11a6e99044204511f9ed547d48451"
            ],
            "version": "==0.3"
        },
        "flake8": {
            "hashes": [
                "sha256:19241c1cbc971b9962473e4438a2ca19749a7dd002dd1a946eaba171b4114548",
                "sha256:8e9dfa3cecb2400b3738a42c54c3043e821682b9c840b0448c0503f781130696"
            ],
            "index": "pypi",
            "version": "==3.7.8"
        },
        "identify": {
            "hashes": [
                "sha256:4f1fe9a59df4e80fcb0213086fcf502bc1765a01ea4fe8be48da3b65afd2a017",
                "sha256:d8919589bd2a5f99c66302fec0ef9027b12ae150b0b0213999ad3f695fc7296e"
            ],
            "version": "==1.4.7"
        },
        "idna": {
            "hashes": [
                "sha256:c357b3f628cf53ae2c4c05627ecc484553142ca23264e593d327bcde5e9c3407",
                "sha256:ea8b7f6188e6fa117537c3df7da9fc686d485087abf6ac197f9c46432f7e4a3c"
            ],
            "version": "==2.8"
        },
        "importlib-metadata": {
            "hashes": [
                "sha256:23d3d873e008a513952355379d93cbcab874c58f4f034ff657c7a87422fa64e8",
                "sha256:80d2de76188eabfbfcf27e6a37342c2827801e59c4cc14b0371c56fed43820e3"
            ],
            "markers": "python_version < '3.8'",
            "version": "==0.19"
        },
        "importlib-resources": {
            "hashes": [
                "sha256:6e2783b2538bd5a14678284a3962b0660c715e5a0f10243fd5e00a4b5974f50b",
                "sha256:d3279fd0f6f847cced9f7acc19bd3e5df54d34f93a2e7bb5f238f81545787078"
            ],
            "markers": "python_version < '3.7'",
            "version": "==1.0.2"
        },
        "isort": {
            "hashes": [
                "sha256:54da7e92468955c4fceacd0c86bd0ec997b0e1ee80d97f67c35a78b719dccab1",
                "sha256:6e811fcb295968434526407adb8796944f1988c5b65e8139058f2014cbe100fd"
            ],
            "index": "pypi",
            "version": "==4.3.21"
        },
        "markdown": {
            "hashes": [
                "sha256:2e50876bcdd74517e7b71f3e7a76102050edec255b3983403f1a63e7c8a41e7a",
                "sha256:56a46ac655704b91e5b7e6326ce43d5ef72411376588afa1dd90e881b83c7e8c"
            ],
            "version": "==3.1.1"
        },
        "mccabe": {
            "hashes": [
                "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42",
                "sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"
            ],
            "version": "==0.6.1"
        },
        "more-itertools": {
            "hashes": [
                "sha256:409cd48d4db7052af495b09dec721011634af3753ae1ef92d2b32f73a745f832",
                "sha256:92b8c4b06dac4f0611c0729b2f2ede52b2e1bac1ab48f089c7ddc12e26bb60c4"
            ],
            "version": "==7.2.0"
        },
        "mypy": {
            "hashes": [
                "sha256:0107bff4f46a289f0e4081d59b77cef1c48ea43da5a0dbf0005d54748b26df2a",
                "sha256:07957f5471b3bb768c61f08690c96d8a09be0912185a27a68700f3ede99184e4",
                "sha256:10af62f87b6921eac50271e667cc234162a194e742d8e02fc4ddc121e129a5b0",
                "sha256:11fd60d2f69f0cefbe53ce551acf5b1cec1a89e7ce2d47b4e95a84eefb2899ae",
                "sha256:15e43d3b1546813669bd1a6ec7e6a11d2888db938e0607f7b5eef6b976671339",
                "sha256:352c24ba054a89bb9a35dd064ee95ab9b12903b56c72a8d3863d882e2632dc76",
                "sha256:437020a39417e85e22ea8edcb709612903a9924209e10b3ec6d8c9f05b79f498",
                "sha256:49925f9da7cee47eebf3420d7c0e00ec662ec6abb2780eb0a16260a7ba25f9c4",
                "sha256:6724fcd5777aa6cebfa7e644c526888c9d639bd22edd26b2a8038c674a7c34bd",
                "sha256:7a17613f7ea374ab64f39f03257f22b5755335b73251d0d253687a69029701ba",
                "sha256:cdc1151ced496ca1496272da7fc356580e95f2682be1d32377c22ddebdf73c91"
            ],
            "index": "pypi",
            "version": "==0.720"
        },
        "mypy-extensions": {
            "hashes": [
                "sha256:37e0e956f41369209a3d5f34580150bcacfabaa57b33a15c0b25f4b5725e0812",
                "sha256:b16cabe759f55e3409a7d231ebd2841378fb0c27a5d1994719e340e4f429ac3e"
            ],
            "version": "==0.4.1"
        },
        "nodeenv": {
            "hashes": [
                "sha256:ad8259494cf1c9034539f6cced78a1da4840a4b157e23640bc4a0c0546b0cb7a"
            ],
            "version": "==1.3.3"
        },
        "packaging": {
            "hashes": [
                "sha256:a7ac867b97fdc07ee80a8058fe4435ccd274ecc3b0ed61d852d7d53055528cf9",
                "sha256:c491ca87294da7cc01902edbe30a5bc6c4c28172b5138ab4e4aa1b9d7bfaeafe"
            ],
            "version": "==19.1"
        },
        "pluggy": {
            "hashes": [
                "sha256:0825a152ac059776623854c1543d65a4ad408eb3d33ee114dff91e57ec6ae6fc",
                "sha256:b9817417e95936bf75d85d3f8767f7df6cdde751fc40aed3bb3074cbcb77757c"
            ],
            "version": "==0.12.0"
        },
        "pre-commit": {
            "hashes": [
                "sha256:1d3c0587bda7c4e537a46c27f2c84aa006acc18facf9970bf947df596ce91f3f",
                "sha256:fa78ff96e8e9ac94c748388597693f18b041a181c94a4f039ad20f45287ba44a"
            ],
            "index": "pypi",
            "version": "==1.18.3"
        },
        "py": {
            "hashes": [
                "sha256:64f65755aee5b381cea27766a3a147c3f15b9b6b9ac88676de66ba2ae36793fa",
                "sha256:dc639b046a6e2cff5bbe40194ad65936d6ba360b52b3c3fe1d08a82dd50b5e53"
            ],
            "version": "==1.8.0"
        },
        "pycco": {
            "hashes": [
                "sha256:087fd95721ebab8b8bddefa7030ffb0f87db8e7cd48007cb83ce9342b6cc2c9f",
                "sha256:70c217ef65946ccb4b76cf1f3a4236601619321046044e163d72ebaccc8ba17e",
                "sha256:f8dae44b65aaab1f6d958200eda542ba4ddd96531245e64fdb793b1b47aa774c"
            ],
            "index": "pypi",
            "version": "==0.6.0"
        },
        "pycodestyle": {
            "hashes": [
                "sha256:95a2219d12372f05704562a14ec30bc76b05a5b297b21a5dfe3f6fac3491ae56",
                "sha256:e40a936c9a450ad81df37f549d676d127b1b66000a6c500caa2b085bc0ca976c"
            ],
            "version": "==2.5.0"
        },
        "pyflakes": {
            "hashes": [
                "sha256:17dbeb2e3f4d772725c777fabc446d5634d1038f234e77343108ce445ea69ce0",
                "sha256:d976835886f8c5b31d47970ed689944a0262b5f3afa00a5a7b4dc81e5449f8a2"
            ],
            "version": "==2.1.1"
        },
        "pygments": {
            "hashes": [
                "sha256:71e430bc85c88a430f000ac1d9b331d2407f681d6f6aec95e8bcfbc3df5b0127",
                "sha256:881c4c157e45f30af185c1ffe8d549d48ac9127433f2c380c24b84572ad66297"
            ],
            "version": "==2.4.2"
        },
        "pyparsing": {
            "hashes": [
                "sha256:6f98a7b9397e206d78cc01df10131398f1c8b8510a2f4d97d9abd82e1aacdd80",
                "sha256:d9338df12903bbf5d65a0e4e87c2161968b10d2e489652bb47001d82a9b028b4"
            ],
            "version": "==2.4.2"
        },
        "pystache": {
            "hashes": [
                "sha256:f7bbc265fb957b4d6c7c042b336563179444ab313fb93a719759111eabd3b85a"
            ],
            "version": "==0.5.4"
        },
        "pytest": {
            "hashes": [
                "sha256:95b1f6db806e5b1b5b443efeb58984c24945508f93a866c1719e1a507a957d7c",
                "sha256:c3d5020755f70c82eceda3feaf556af9a341334414a8eca521a18f463bcead88"
            ],
            "index": "pypi",
            "version": "==5.1.1"
        },
        "pytest-black": {
            "hashes": [
                "sha256:75bbeccfe23442a190164c0bf202d7498df25451fa4177b781cee20183e7fc0d"
            ],
            "index": "pypi",
            "version": "==0.3.7"
        },
        "pytest-cov": {
            "hashes": [
                "sha256:2b097cde81a302e1047331b48cadacf23577e431b61e9c6f49a1170bbe3d3da6",
                "sha256:e00ea4fdde970725482f1f35630d12f074e121a23801aabf2ae154ec6bdd343a"
            ],
            "index": "pypi",
            "version": "==2.7.1"
        },
        "pyyaml": {
            "hashes": [
                "sha256:0113bc0ec2ad727182326b61326afa3d1d8280ae1122493553fd6f4397f33df9",
                "sha256:01adf0b6c6f61bd11af6e10ca52b7d4057dd0be0343eb9283c878cf3af56aee4",
                "sha256:5124373960b0b3f4aa7df1707e63e9f109b5263eca5976c66e08b1c552d4eaf8",
                "sha256:5ca4f10adbddae56d824b2c09668e91219bb178a1eee1faa56af6f99f11bf696",
                "sha256:7907be34ffa3c5a32b60b95f4d95ea25361c951383a894fec31be7252b2b6f34",
                "sha256:7ec9b2a4ed5cad025c2278a1e6a19c011c80a3caaac804fd2d329e9cc2c287c9",
                "sha256:87ae4c829bb25b9fe99cf71fbb2140c448f534e24c998cc60f39ae4f94396a73",
                "sha256:9de9919becc9cc2ff03637872a440195ac4241c80536632fffeb6a1e25a74299",
                "sha256:a5a85b10e450c66b49f98846937e8cfca1db3127a9d5d1e31ca45c3d0bef4c5b",
                "sha256:b0997827b4f6a7c286c01c5f60384d218dca4ed7d9efa945c3e1aa623d5709ae",
                "sha256:b631ef96d3222e62861443cc89d6563ba3eeb816eeb96b2629345ab795e53681",
                "sha256:bf47c0607522fdbca6c9e817a6e81b08491de50f3766a7a0e6a5be7905961b41",
                "sha256:f81025eddd0327c7d4cfe9b62cf33190e1e736cc6e97502b3ec425f574b3e7a8"
            ],
            "version": "==5.1.2"
        },
        "requests": {
            "hashes": [
                "sha256:11e007a8a2aa0323f5a921e9e6a2d7e4e67d9877e85773fba9ba6419025cbeb4",
                "sha256:9cf5292fcd0f598c671cfc1e0d7d1a7f13bb8085e9a590f48c010551dc6c4b31"
            ],
            "version": "==2.22.0"
        },
        "safety": {
            "hashes": [
                "sha256:0a3a8a178a9c96242b224f033ee8d1d130c0448b0e6622d12deaf37f6c3b4e59",
                "sha256:5059f3ffab3648330548ea9c7403405bbfaf085b11235770825d14c58f24cb78"
            ],
            "index": "pypi",
            "version": "==1.8.5"
        },
        "six": {
            "hashes": [
                "sha256:3350809f0555b11f552448330d0b52d5f24c91a322ea4a15ef22629740f3761c",
                "sha256:d16a0141ec1a18405cd4ce8b4613101da75da0e9a7aec5bdd4fa804d0e0eba73"
            ],
            "version": "==1.12.0"
        },
        "smartypants": {
            "hashes": [
                "sha256:8db97f7cbdf08d15b158a86037cd9e116b4cf37703d24e0419a0d64ca5808f0d"
            ],
            "version": "==2.0.1"
        },
        "toml": {
            "hashes": [
                "sha256:229f81c57791a41d65e399fc06bf0848bab550a9dfd5ed66df18ce5f05e73d5c",
                "sha256:235682dd292d5899d361a811df37e04a8828a5b1da3115886b73cf81ebc9100e"
            ],
            "version": "==0.10.0"
        },
        "typed-ast": {
            "hashes": [
                "sha256:18511a0b3e7922276346bcb47e2ef9f38fb90fd31cb9223eed42c85d1312344e",
                "sha256:262c247a82d005e43b5b7f69aff746370538e176131c32dda9cb0f324d27141e",
                "sha256:2b907eb046d049bcd9892e3076c7a6456c93a25bebfe554e931620c90e6a25b0",
                "sha256:354c16e5babd09f5cb0ee000d54cfa38401d8b8891eefa878ac772f827181a3c",
                "sha256:4e0b70c6fc4d010f8107726af5fd37921b666f5b31d9331f0bd24ad9a088e631",
                "sha256:630968c5cdee51a11c05a30453f8cd65e0cc1d2ad0d9192819df9978984529f4",
                "sha256:66480f95b8167c9c5c5c87f32cf437d585937970f3fc24386f313a4c97b44e34",
                "sha256:71211d26ffd12d63a83e079ff258ac9d56a1376a25bc80b1cdcdf601b855b90b",
                "sha256:95bd11af7eafc16e829af2d3df510cecfd4387f6453355188342c3e79a2ec87a",
                "sha256:bc6c7d3fa1325a0c6613512a093bc2a2a15aeec350451cbdf9e1d4bffe3e3233",
                "sha256:cc34a6f5b426748a507dd5d1de4c1978f2eb5626d51326e43280941206c209e1",
                "sha256:d755f03c1e4a51e9b24d899561fec4ccaf51f210d52abdf8c07ee2849b212a36",
                "sha256:d7c45933b1bdfaf9f36c579671fec15d25b06c8398f113dab64c18ed1adda01d",
                "sha256:d896919306dd0aa22d0132f62a1b78d11aaf4c9fc5b3410d3c666b818191630a",
                "sha256:ffde2fbfad571af120fcbfbbc61c72469e72f550d676c3342492a9dfdefb8f12"
            ],
            "version": "==1.4.0"
        },
        "typing-extensions": {
            "hashes": [
                "sha256:2ed632b30bb54fc3941c382decfd0ee4148f5c591651c9272473fea2c6397d95",
                "sha256:b1edbbf0652660e32ae780ac9433f4231e7339c7f9a8057d0f042fcbcea49b87",
                "sha256:d8179012ec2c620d3791ca6fe2bf7979d979acdbef1fca0bc56b37411db682ed"
            ],
            "version": "==3.7.4"
        },
        "urllib3": {
            "hashes": [
                "sha256:b246607a25ac80bedac05c6f282e3cdaf3afb65420fd024ac94435cabe6e18d1",
                "sha256:dbe59173209418ae49d485b87d1681aefa36252ee85884c31346debd19463232"
            ],
            "version": "==1.25.3"
        },
        "virtualenv": {
            "hashes": [
                "sha256:94a6898293d07f84a98add34c4df900f8ec64a570292279f6d91c781d37fd305",
                "sha256:f6fc312c031f2d2344f885de114f1cb029dfcffd26aa6e57d2ee2296935c4e7d"
            ],
            "version": "==16.7.4"
        },
        "wcwidth": {
            "hashes": [
                "sha256:3df37372226d6e63e1b1e1eda15c594bca98a22d33a23832a90998faa96bc65e",
                "sha256:f4ebe71925af7b40a864553f761ed559b43544f8f71746c2d756c7fe788ade7c"
            ],
            "version": "==0.1.7"
        },
        "zipp": {
            "hashes": [
                "sha256:3718b1cbcd963c7d4c5511a8240812904164b7f381b647143a89d3b98f9bcd8e",
                "sha256:f06903e9f1f43b12d371004b4ac7b06ab39a44adc747266928ae6debfa7b3335"
            ],
            "version": "==0.6.0"
        }
    }
}

```
</details>

the lock file seems to be generated correctly,  however, the `-r` flag does not seems to provide me the correct requirements.txt   

I am not sure if I missed a step on the instruction or just used it wrong.
```
root@03c9d7dcf069:/tmp# pipenv lock -r > requirements.txt
root@03c9d7dcf069:/tmp#  cat requirements.txt 
-i https://pypi.python.org/simple

```


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Pipenv lock -r > requirements.txt does not produce the correct requirements.txt #3915

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