pipenv tests fail with Python 3.7: RuntimeError: generator raised StopIteration (from prettytoml)

[hroncok]

The testuite fails on Python 3.7 due to PEP 479.

$ python -m pipenv.help output

Pipenv version: '2018.6.26.dev0'

Pipenv location: '/home/churchyard/Dokumenty/RedHat/pipenv/pipenv'

Python location: '/home/churchyard/.local/share/virtualenvs/pipenv-7nIhKB6W-3.7/bin/python'

Other Python installations in PATH:

• 2.6: /usr/bin/python2.6

• 2.6: /usr/bin/python2.6

• 2.6: /bin/python2.6

• 2.7: /usr/bin/python2.7

• 2.7: /usr/bin/python2.7

• 2.7: /bin/python2.7

• 3.4: /usr/bin/python3.4m

• 3.4: /usr/bin/python3.4

• 3.4: /bin/python3.4

• 3.5: /usr/bin/python3.5m

• 3.5: /usr/bin/python3.5

• 3.5: /bin/python3.5

• 3.6: /usr/bin/python3.6m

• 3.6: /usr/bin/python3.6

• 3.6: /bin/python3.6

• 3.7: /home/churchyard/.local/share/virtualenvs/pipenv-7nIhKB6W-3.7/bin/python3.7m

• 3.7: /home/churchyard/.local/share/virtualenvs/pipenv-7nIhKB6W-3.7/bin/python3.7

• 3.7: /usr/bin/python3.7

• 3.7: /bin/python3.7

• 3.7.0: /home/churchyard/.local/share/virtualenvs/pipenv-7nIhKB6W-3.7/bin/python

• 2.7.14: /usr/bin/python

• 2.7.14: /bin/python

• 2.7.14: /usr/bin/python2

• 2.7.14: /bin/python2

• 3.7.0: /home/churchyard/.local/share/virtualenvs/pipenv-7nIhKB6W-3.7/bin/python3

• 3.6.5: /usr/bin/python3

• 3.6.5: /bin/python3

PEP 508 Information:

{'implementation_name': 'cpython',
 'implementation_version': '3.7.0c1',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '4.16.7-300.fc28.x86_64',
 'platform_system': 'Linux',
 'platform_version': '#1 SMP Wed May 2 20:09:13 UTC 2018',
 'python_full_version': '3.7.0rc1',
 'python_version': '3.7',
 'sys_platform': 'linux'}

System environment variables:

• PIPENV_PYTHON
• LS_COLORS
• GIT_PS1_SHOWUNTRACKEDFILES
• XDG_MENU_PREFIX
• LANG
• HISTCONTROL
• DISPLAY
• GUESTFISH_RESTORE
• HOSTNAME
• OLDPWD
• COLORTERM
• GUESTFISH_INIT
• XDG_VTNR
• CVSROOT
• SSH_AUTH_SOCK
• GLADE_CATALOG_PATH
• XDG_SESSION_ID
• XDG_GREETER_DATA_DIR
• USER
• GLADE_MODULE_PATH
• GUESTFISH_PS1
• DESKTOP_SESSION
• VAGRANT_DEFAULT_PROVIDER
• PWD
• SSH_ASKPASS
• HOME
• GIT_PS1_SHOWDIRTYSTATE
• SSH_AGENT_PID
• LMOD_VERSION
• LMOD_SETTARG_CMD
• XDG_SESSION_TYPE
• BASH_ENV
• XDG_DATA_DIRS
• AUTOJUMP_ERROR_PATH
• XDG_SESSION_DESKTOP
• LMOD_sys
• GLADE_PIXMAP_PATH
• _JAVA_OPTIONS
• MAIL
• AUTOJUMP_SOURCED
• VTE_VERSION
• SHELL
• TERM
• GNOME_KEYRING_CONTROL
• XDG_SEAT_PATH
• XDG_CURRENT_DESKTOP
• SHLVL
• XDG_SEAT
• MANPATH
• WINDOWID
• MODULEPATH
• GDMSESSION
• LOGNAME
• DBUS_SESSION_BUS_ADDRESS
• XDG_RUNTIME_DIR
• XAUTHORITY
• MODULEPATH_ROOT
• XDG_SESSION_PATH
• XDG_CONFIG_DIRS
• PATH
• GUESTFISH_OUTPUT
• PS1
• MODULESHOME
• HISTSIZE
• LMOD_PKG
• SESSION_MANAGER
• LMOD_CMD
• CVS_RSH
• LESSOPEN
• LMOD_FULL_SETTARG_SUPPORT
• LMOD_DIR
• BASH_FUNC_module%%
• BASH_FUNC_ml%%
• _
• PYTHONDONTWRITEBYTECODE
• PIP_PYTHON_PATH
• HELLO
• PYPI_VENDOR_DIR

Pipenv–specific environment variables:

• PIPENV_PYTHON: 3.7

Debug–specific environment variables:

• PATH: /home/churchyard/.local/share/virtualenvs/pipenv-7nIhKB6W-3.7/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/home/churchyard/.local/bin:/home/churchyard/bin
• SHELL: /bin/bash
• LANG: cs_CZ.utf8
• PWD: /home/churchyard/Dokumenty/RedHat/pipenv

---

Contents of Pipfile ('/home/churchyard/Dokumenty/RedHat/pipenv/Pipfile'):

[dev-packages]
pipenv = {path = ".", editable = true}
"flake8" = ">=3.3.0,<4"
pytest = "*"
mock = "*"
sphinx = "<=1.5.5"
twine = "*"
sphinx-click = "*"
pytest-xdist = "*"
click = "*"
pytest-pypy = {path = "./tests/pytest-pypi", editable = true}
pytest-tap = "*"
flaky = "*"
stdeb = {version="*", markers="sys_platform == 'linux'"}
black = {version="*", markers="python_version >= '3.6'"}
pytz = "*"
towncrier = {git = "https://github.com/hawkowl/towncrier.git", editable = true, ref = "master"}
parver = "*"

[packages]

[scripts]
tests = "bash ./run-tests.sh"

[pipenv]
allow_prereleases = true

Contents of Pipfile.lock ('/home/churchyard/Dokumenty/RedHat/pipenv/Pipfile.lock'):

{
    "_meta": {
        "hash": {
            "sha256": "ee9e8c04f9a6b7ad4cdaa7db728b51b9fef04b6cad9f012edd230a6241b43f92"
        },
        "pipfile-spec": 6,
        "requires": {},
        "sources": [{
            "name": "pypi",
            "url": "https://pypi.org/simple",
            "verify_ssl": true
        }]
    },
    "default": {},
    "develop": {
        "alabaster": {
            "hashes": [
                "sha256:2eef172f44e8d301d25aff8068fddd65f767a3f04b5f15b0f4922f113aa1c732",
                "sha256:37cdcb9e9954ed60912ebc1ca12a9d12178c26637abdf124e3cde2341c257fe0"
            ],
            "version": "==0.7.10"
        },
        "apipkg": {
            "hashes": [
                "sha256:2e38399dbe842891fe85392601aab8f40a8f4cc5a9053c326de35a1cc0297ac6",
                "sha256:65d2aa68b28e7d31233bb2ba8eb31cda40e4671f8ac2d6b241e358c9652a74b9"
            ],
            "version": "==1.4"
        },
        "appdirs": {
            "hashes": [
                "sha256:9e5896d1372858f8dd3344faf4e5014d21849c756c8d5701f78f8a103b372d92",
                "sha256:d8b24664561d0d34ddfaec54636d502d7cea6e29c3eaf68f3df6180863e2166e"
            ],
            "version": "==1.4.3"
        },
        "atomicwrites": {
            "hashes": [
                "sha256:240831ea22da9ab882b551b31d4225591e5e447a68c5e188db5b89ca1d487585",
                "sha256:a24da68318b08ac9c9c45029f4a10371ab5b20e4226738e150e6e7c571630ae6"
            ],
            "version": "==1.1.5"
        },
        "arpeggio": {
            "hashes": [
                "sha256:828ea85ca3c7a99125dc83000ca170c1ea1105c75cbf67a513c2e16e05e36f67",
                "sha256:984a53471327bbb69ed528cac98fa6d42c1676300d047fc13fada69dd5f84ce4"
            ],
            "version": "==1.8.0"
        },
        "attrs": {
            "hashes": [
                "sha256:4b90b09eeeb9b88c35bc642cbac057e45a5fd85367b985bd2809c62b7b939265",
                "sha256:e0d0eb91441a3b53dab4d9b743eafc1ac44476296a2053b6ca3af0b139faf87b"
            ],
            "version": "==18.1.0"
        },
        "babel": {
            "hashes": [
                "sha256:6778d85147d5d85345c14a26aada5e478ab04e39b078b0745ee6870c2b5cf669",
                "sha256:8cba50f48c529ca3fa18cf81fa9403be176d374ac4d60738b839122dfaaa3d23"
            ],
            "version": "==2.6.0"
        },
        "black": {
            "hashes": [
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                "sha256:fc26c4ab28c541fb824f59fa83d5702f75829495d5a1dee603b29bc4fbe79095"
            ],
            "index": "pypi",
            "markers": "python_version >= '3.6'",
            "version": "==18.6b2"
        },
        "certifi": {
            "hashes": [
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                "sha256:9fa520c1bacfb634fa7af20a76bcbd3d5fb390481724c597da32c719a7dca4b0"
            ],
            "version": "==2018.4.16"
        },
        "chardet": {
            "hashes": [
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                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
            ],
            "version": "==3.0.4"
        },
        "click": {
            "hashes": [
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                "sha256:f15516df478d5a56180fbf80e68f206010e6d160fc39fa508b65e035fd75130b"
            ],
            "index": "pypi",
            "version": "==6.7"
        },
        "colorama": {
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                "sha256:48eb22f4f8461b1df5734a074b57042430fb06e1d61bd1e11b078c0fe6d7a1f1"
            ],
            "markers": "sys_platform == 'win32'",
            "version": "==0.3.9"
        },
        "configparser": {
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            ],
            "markers": "python_version < '3.2'",
            "version": "==3.5.0"
        },
        "docutils": {
            "hashes": [
                "sha256:02aec4bd92ab067f6ff27a38a38a41173bf01bed8f89157768c1573f53e474a6",
                "sha256:51e64ef2ebfb29cae1faa133b3710143496eca21c530f3f71424d77687764274",
                "sha256:7a4bd47eaf6596e1295ecb11361139febe29b084a87bf005bf899f9a42edc3c6"
            ],
            "version": "==0.14"
        },
        "enum34": {
            "hashes": [
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                "sha256:644837f692e5f550741432dd3f223bbb9852018674981b1664e5dc339387588a",
                "sha256:6bd0f6ad48ec2aa117d3d141940d484deccda84d4fcd884f5c3d93c23ecd8c79",
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            "markers": "python_version < '3.4'",
            "version": "==1.1.6"
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        "execnet": {
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                "sha256:fc155a6b553c66c838d1a22dba1dc9f5f505c43285a878c6f74a79c024750b83"
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            "version": "==1.5.0"
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        "flake8": {
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                "sha256:c7841163e2b576d435799169b78703ad6ac1bbb0f199994fc05f700b2a90ea37"
            ],
            "index": "pypi",
            "version": "==3.5.0"
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        "flaky": {
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                "sha256:d0533f473a46b916e6db6e84e20b06d8a70656600a0c14e819b0760b63f70226"
            ],
            "index": "pypi",
            "version": "==3.4.0"
        },
        "flask": {
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                "sha256:a080b744b7e345ccfcbc77954861cb05b3c63786e93f2b3875e0913d44b43f05"
            ],
            "version": "==1.0.2"
        },
        "funcsigs": {
            "hashes": [
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                "sha256:a7bb0f2cf3a3fd1ab2732cb49eba4252c2af4240442415b4abce3b87022a8f50"
            ],
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            "version": "==1.0.2"
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        "imagesize": {
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                "sha256:5b326e4678b6925158ccc66a9fa3122b6106d7c876ee32d7de6ce59385b96315"
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            "version": "==1.0.0"
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            ],
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        "packaging": {
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            "version": "==17.1"
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            "version": "==4.0.4"
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        "pipenv": {
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            "path": "."
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        "pkginfo": {
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                "sha256:8d616a382f243dbf19b54743f280b80198be0bca3a5396f1d2e1fca6223e8805"
            ],
            "version": "==1.6.0"
        },
        "pygments": {
            "hashes": [
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                "sha256:dbae1046def0efb574852fab9e90209b23f556367b5a320c0bcb871c77c3e8cc"
            ],
            "version": "==2.2.0"
        },
        "pyparsing": {
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                "sha256:281683241b25fe9b80ec9d66017485f6deff1af5cde372469134b56ca8447a07",
                "sha256:8f1e18d3fd36c6795bb7e02a39fd05c611ffc2596c1e0d995d34d67630426c18",
                "sha256:9e8143a3e15c13713506886badd96ca4b579a87fbdf49e550dbfc057d6cb218e",
                "sha256:b8b3117ed9bdf45e14dcc89345ce638ec7e0e29b2b579fa1ecf32ce45ebac8a5",
                "sha256:e4d45427c6e20a59bf4f88c639dcc03ce30d193112047f94012102f235853a58",
                "sha256:fee43f17a9c4087e7ed1605bd6df994c6173c1e977d7ade7b651292fab2bd010"
            ],
            "version": "==2.2.0"
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        "pytest": {
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                "sha256:32c49a69566aa7c333188149ad48b58ac11a426d5352ea3d8f6ce843f88199cb"
            ],
            "index": "pypi",
            "version": "==3.6.1"
        },
        "pytest-forked": {
            "hashes": [
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                "sha256:f275cb48a73fc61a6710726348e1da6d68a978f0ec0c54ece5a5fae5977e5a08"
            ],
            "version": "==0.2"
        },
        "pytest-pypy": {
            "editable": true,
            "path": "./tests/pytest-pypi"
        },
        "pytest-tap": {
            "hashes": [
                "sha256:06ff3ca882b69814f20e36533157394372479c91c21233964dab52c071faf8d3",
                "sha256:ea621f3ab77c12dc662ad6daeeb0152cfab522e2ef968d90500cf4c0a59dc965"
            ],
            "index": "pypi",
            "version": "==2.2"
        },
        "pytest-xdist": {
            "hashes": [
                "sha256:be2662264b035920ba740ed6efb1c816a83c8a22253df7766d129f6a7bfdbd35",
                "sha256:e8f5744acc270b3e7d915bdb4d5f471670f049b6fbd163d4cbd52203b075d30f"
            ],
            "index": "pypi",
            "version": "==1.22.2"
        },
        "pytz": {
            "hashes": [
                "sha256:65ae0c8101309c45772196b21b74c46b2e5d11b6275c45d251b150d5da334555",
                "sha256:c06425302f2cf668f1bba7a0a03f3c1d34d4ebeef2c72003da308b3947c7f749"
            ],
            "index": "pypi",
            "version": "==2018.4"
        },
        "requests": {
            "hashes": [
                "sha256:63b52e3c866428a224f97cab011de738c36aec0185aa91cfacd418b5d58911d1",
                "sha256:ec22d826a36ed72a7358ff3fe56cbd4ba69dd7a6718ffd450ff0e9df7a47ce6a"
            ],
            "version": "==2.19.1"
        },
        "requests-toolbelt": {
            "hashes": [
                "sha256:42c9c170abc2cacb78b8ab23ac957945c7716249206f90874651971a4acff237",
                "sha256:f6a531936c6fa4c6cfce1b9c10d5c4f498d16528d2a54a22ca00011205a187b5"
            ],
            "version": "==0.8.0"
        },
        "six": {
            "hashes": [
                "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9",
                "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb"
            ],
            "version": "==1.11.0"
        },
        "snowballstemmer": {
            "hashes": [
                "sha256:919f26a68b2c17a7634da993d91339e288964f93c274f1343e3bbbe2096e1128",
                "sha256:9f3bcd3c401c3e862ec0ebe6d2c069ebc012ce142cce209c098ccb5b09136e89"
            ],
            "version": "==1.2.1"
        },
        "sphinx": {
            "hashes": [
                "sha256:11f271e7a9398385ed730e90f0bb41dc3815294bdcd395b46ed2d033bc2e7d87",
                "sha256:4064ea6c56feeb268838cb8fbbee507d0c3d5d92fa63a7df935a916b52c9e2f5"
            ],
            "index": "pypi",
            "version": "==1.5.5"
        },
        "sphinx-click": {
            "hashes": [
                "sha256:2d1ead3335ee43c4959ed1dd2b29156de1e2709b6d45ba42497fcd8d334c9c2c",
                "sha256:b3973152d29fb86f0196e47878c96e2b8b1edbcc854268f3f82847277e5182cf"
            ],
            "index": "pypi",
            "version": "==1.2.0"
        },
        "sphinxcontrib-websupport": {
            "hashes": [
                "sha256:68ca7ff70785cbe1e7bccc71a48b5b6d965d79ca50629606c7861a21b206d9dd",
                "sha256:9de47f375baf1ea07cdb3436ff39d7a9c76042c10a769c52353ec46e4e8fc3b9"
            ],
            "version": "==1.1.0"
        },
        "stdeb": {
            "hashes": [
                "sha256:0ed2c2cc6b8ba21da7d646c6f37ca60b22e9e4950e3cec6bcd9c2e7e57e3747e"
            ],
            "index": "pypi",
            "markers": "sys_platform == 'linux'",
            "version": "==0.8.5"
        },
        "tap.py": {
            "hashes": [
                "sha256:03accd27118473475b33b44703b223df2f148679b9b01b6ac59866df0b580073",
                "sha256:06416d376f0d398ab163674f30ea3b4a320957e4baa51793b8e86bdfdfeb857d"
            ],
            "version": "==2.4"
        },
        "toml": {
            "hashes": [
                "sha256:8e86bd6ce8cc11b9620cb637466453d94f5d57ad86f17e98a98d1f73e3baab2d"
            ],
            "version": "==0.9.4"
        },
        "towncrier": {
            "editable": true,
            "git": "https://github.com/hawkowl/towncrier.git",
            "ref": "491eec5e07e971894aa41b7c6f7892023d81bb81"
        },
        "tqdm": {
            "hashes": [
                "sha256:224291ee0d8c52d91b037fd90806f48c79bcd9994d3b0abc9e44b946a908fccd",
                "sha256:77b8424d41b31e68f437c6dd9cd567aebc9a860507cb42fbd880a5f822d966fe"
            ],
            "version": "==4.23.4"
        },
        "typing": {
            "hashes": [
                "sha256:3a887b021a77b292e151afb75323dea88a7bc1b3dfa92176cff8e44c8b68bddf",
                "sha256:b2c689d54e1144bbcfd191b0832980a21c2dbcf7b5ff7a66248a60c90e951eb8",
                "sha256:d400a9344254803a2368533e4533a4200d21eb7b6b729c173bc38201a74db3f2"
            ],
            "markers": "python_version < '3.5'",
            "version": "==3.6.4"
        },
        "twine": {
            "hashes": [
                "sha256:08eb132bbaec40c6d25b358f546ec1dc96ebd2638a86eea68769d9e67fe2b129",
                "sha256:2fd9a4d9ff0bcacf41fdc40c8cb0cfaef1f1859457c9653fd1b92237cc4e9f25"
            ],
            "index": "pypi",
            "version": "==1.11.0"
        },
        "urllib3": {
            "hashes": [
                "sha256:a68ac5e15e76e7e5dd2b8f94007233e01effe3e50e8daddf69acfd81cb686baf",
                "sha256:b5725a0bd4ba422ab0e66e89e030c806576753ea3ee08554382c14e685d117b5"
            ],
            "version": "==1.23"
        },
        "virtualenv": {
            "hashes": [
                "sha256:2ce32cd126117ce2c539f0134eb89de91a8413a29baac49cbab3eb50e2026669",
                "sha256:ca07b4c0b54e14a91af9f34d0919790b016923d157afda5efdde55c96718f752"
            ],
            "version": "==16.0.0"
        },
        "virtualenv-clone": {
            "hashes": [
                "sha256:4507071d81013fd03ea9930ec26bc8648b997927a11fa80e8ee81198b57e0ac7",
                "sha256:b5cfe535d14dc68dfc1d1bb4ac1209ea28235b91156e2bba8e250d291c3fb4f8"
            ],
            "version": "==0.3.0"
        },
        "werkzeug": {
            "hashes": [
                "sha256:c3fd7a7d41976d9f44db327260e263132466836cef6f91512889ed60ad26557c",
                "sha256:d5da73735293558eb1651ee2fddc4d0dedcfa06538b8813a2e20011583c9e49b"
            ],
            "version": "==0.14.1"
        }
    }
}

---

Expected result

The testsuite should pass, pipenv should work on Python 3.7.

Actual result

tests/unit/test_vendor.py::test_table 
[gw0] [100%] FAILED tests/unit/test_vendor.py::test_table 

=================================== FAILURES ===================================
__________________________________ test_table __________________________________
[gw0] linux -- Python 3.7.0 /home/churchyard/.local/share/virtualenvs/pipenv-7nIhKB6W-3.7/bin/python3.7m

    def test_table():
        initial_toml = """id=42 # My id\nage=14"""
        tokens = tuple(lexer.tokenize(initial_toml))
        table = TableElement(
            [
                AtomicElement(tokens[0:1]),
                PunctuationElement(tokens[1:2]),
                AtomicElement(tokens[2:3]),
                WhitespaceElement(tokens[3:4]),
                CommentElement(tokens[4:6]),
                AtomicElement(tokens[6:7]),
                PunctuationElement(tokens[7:8]),
>               AtomicElement(tokens[8:9]),
            ]
        )

tests/unit/test_vendor.py:33: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
pipenv/patched/prettytoml/elements/table.py:22: in __init__
    self._check_for_duplicate_keys()
pipenv/patched/prettytoml/elements/table.py:25: in _check_for_duplicate_keys
    if len(set(self.keys())) < len(self.keys()):
pipenv/patched/prettytoml/elements/abstracttable.py:37: in keys
    return tuple(key for (key, _) in self.items())
pipenv/patched/prettytoml/elements/abstracttable.py:37: in <genexpr>
    return tuple(key for (key, _) in self.items())
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <[RuntimeError("generator raised StopIteration") raised in repr()] TableElement object at 0x7f1e19187ef0>

    def items(self):
>       for (key_i, key), (value_i, value) in self._enumerate_items():
E       RuntimeError: generator raised StopIteration

pipenv/patched/prettytoml/elements/abstracttable.py:30: RuntimeError
===Flaky Test Report===


===End Flaky Test Report===
=========================== 1 failed in 4.48 seconds ===========================

Steps to replicate

I run the testuite as:

$ PIPENV_PYTHON=3.7 pipenv install --dev
$ PIPENV_PYTHON=3.7 pipenv run time pytest -v -n auto tests

Or just the failing test:

$ PIPENV_PYTHON=3.7 pipenv run time pytest -v -n auto tests -k test_table

[hroncok]

Upstream (dead?) PR: https://github.com/jumpscale7/python-pretty-toml/pull/2

I am not sending a PR here, as it says in big DO NOT TOUCH. I wonder who has the touching powers.

[techalchemy]

You do! :p if you have a fix feel free to patch (I think you know the process but tasks/vendoring/patches/patched/) -- we are making most of the necessary changes to the toml landscape ourselves anyway. The failures have been on my radar somewhat, I just haven't turned on 3.7 officially yet

[techalchemy]

oof i'm glad you posted this, I hadn't read that pep. I am going to get super burned by that if I don't fix stuff

[uranusjr]

Wow, I didn’t even know there’s a behaviour change. Thanks for the catch.

[hroncok]

Checking patch pipenv/patched/notpip/_internal/pep425tags.py...
error: while searching for:
pass

# Check glibc version. CentOS 5 uses glibc 2.5.
return pipenv.patched.notpip._internal.utils.glibc.have_compatible_glibc(2, 5)

def get_darwin_arches(major, minor, machine):

error: patch failed: pipenv/patched/notpip/_internal/pep425tags.py:157
error: pipenv/patched/notpip/_internal/pep425tags.py: patch does not apply