Mypy namespace packages Mypy has a powerful type system with features such as type inference, gradual typing, generics and union types. It looks like you are running mypy inside a github action so you can either modify the github action itself (it will be under . 0. py. We should fix this. version import __version__. --namespace-packages, --no-namespace-packages) but this did not resolve the issue. In particular, this prevents discovery of packages that don't have an __init__. The mypy docs also have more info about PEP-561-aware packages. mock package. mypy_cache (to exclude any directory named . You may wish to explore something that uses the location of This patch keeps a scoped ignore of the extension itself since MyPy doesn't like namespace packages somehow and it needs to be investigated further [[1]]. In particular, this prevents discovery of packages that don't have an __init__. We are forced to either: put __init__. According to the docs, a package should be found (and have precedence over a module) if a directory has __init__. Some times feels like it --no-namespace-packages This flag disables import discovery of namespace packages (see PEP 420). 15. py we turn the namespace module into a normal module and hence block the namespace for other packages I'm pretty sure this is related to Issue #8944 on mypy and the way which vscode-python executes mypy on the open files. This chapter introduces some core concepts of mypy, including function annotations, the typing module, stub files, and more. Copy link webknjaz commented Sep 27, 2023. py will be inaccessible. 961 I was able to scan my namespace packages without any issue. This seems likely similar to #7276, however even with #10937 in place (i. answered Nov 15 '22 06:11 Constantinos. in file, passing include_package_data=True to setup. 990 adds support for namespace packages by default. __init__ that imports from moduleA. But I can create fn/__init__. Default: True. This feature is very useful for monorepos and when sharing code between projects. And mypy nags about duplicate modules Even with MYPYPATH=pkg1,pkg2 mypy --namespace-packages --explicit-package-bases . We will have to support namespace packages in mypy. package1. setup. ) 3. It works fine without --namespace-packages (except, you know, namespace packages don't work). This is a Python Poetry plugin, adding the build-project and check-project commands. Distributing a We’ve just uploaded mypy 1. my_pkg_name does contain an __init__. You may even want to temporarily introduce errors in certain files to make sure Mypy will notice them. If the package name contains dashes -they are replaced with underscores _. If it's just startup overhead, I can live with it. You can also create your own stubs that will Bug Report It seems that mypy isn't considering all parts of namespace package paths, and is only checking the sources corresponding to the first path in its path. If any distribution does not, it will cause the namespace logic to fail and the other sub-packages will not be importable. 0 documentation For example, running mypy with these CLI args fixes the issue: mypy --no-namespace-packages --ignore-missing-imports src. 1 answer. after the last version of mypy, I started to see all the typehinting for the notebooks folder I have at the Bug Report Mypy is not able to understand pkg_resources-style namespace packages. py". start gdb and then source the previously written script: source /path/to/script. Tooling needs to understand your package structure too Crash Report This is similar to #15979: For namespace packages, e. , when a package contains a data directory without any Python files, IsADirectoryError is raised This option may only be set in the global section ([mypy]). 15 to the Python Package Index . toml and type guards, and ships wheels for Apple Silicon. 310k; asked Feb 7, 2018 at 16:01. Sign in to Comment. I have a custom namespace package with additional data files that are included via the package_data argument of setuptools. The check-project command is useful to check that dependencies are added properly Bug Report Imports between nested inner packages in namespace packages cause mypy to be confused and complain about files being accessible via multiple names. py (or __init__. This means: If you want a package, add __init__. py file. Mypy now supports pyproject. py files. ; Relative patterns, like directory/foo. toml makes mypy report "Can't find package". py or __init__. There is currently no way for Mypy to discover hello_service_test. For namespace packages (see PEP 420), the py. manual page for mypy 1. This option may only be set in the global section ([mypy]). This Fix help message for --no-namespace-packages (Raphael Krupinski, PR 17472) Fix typechecking for async generators (Danny Yang, PR 17452) (Mypy 0. pyi to the directory. For example if you generated the stubs using stubgen for module "MODULE" like so: stubgen -m MODULE -o stubs, stubgen will then generate the stubs in stubs/MODULE. ) With that setup, I agree you have a predicament. 9. . When mypy encounters an import statement or receives module names from the command line via the --module or --package flags, mypy tries to find the module on the file system similar to the way Python finds it. 2. I've got Bug Report in the built-in help, the description for --no-namespace-packages is reversed. Follow-up to #5591. In the case of namespace_packages = true, it seems that mypy is satisfied with a directory missing an __init__. If I don't have any mypy settings, and run mypy namespace_package, things seem to work fine. Plus, there are many other features and bug fixes. I've tried adding various mypy flags (e. If you’re using mypy, you’ll need to turn on namespace packages, otherwise mypy won’t be able to run correctly. I've just upgraded today to 0. 1 and 1. When running mypy on mypy with mypy --namespace-packages mypy, we now pick up all of typeshed. [mypy] mypy_path = components, bases namespace_packages = True explicit_package_bases = True. After recently upgrading from sqlalchemy 1. ; While using a namespace package like a regular package usually works, it may unexpectedly fail when package names Mypy now enables --namespace-packages by default , so that namespace packages (packages with a missing __init__. 88. In particular, this prevents discovery of packages that don’t have an __init__. See also Mypy docs — No errors reported for obviously wrong code. py can be a package (there's a PEP for that). If you’re looking for a quick intro, see the mypy cheatsheet. py, everything under the hello namespace will be type checked as expected with mypy . py (or The mypy configuration file¶ Mypy is very configurable. Note that when you use the -p arg you cannot specify a directory as well. For example: # MANIFEST. Expected Behavior. github/workflows/ ), or the better approach would be to create or modify an existing mypy config file with these CLI Every distribution that uses the namespace package must include such an __init__. py imports hello_service. Background: I'm trying to use namespace packages, Plus, it appears that mypy accepts this variant. Unfortunately this leads to mypy thinking that src is the namespace of pkg, since it is located at the working mypy - Man Page. I am in the directory containing my python package, and running mypy -p <package-name>, but it just errors out with "Can't find package". 770) on the files, I get this error: error: Skipping an Add type annotations to your Python programs, and use mypy to type check them. Exclusions are based on globs, and can be either: Single-path patterns, like . --no-namespace-packages ¶ This flag disables import discovery of namespace packages (see PEP 420). Ref python/mypy#14057. option:: --namespace-packages This flag enables import discovery to use namespace packages (see :pep:`420`). What am I doing wrong? Skip to main content. Any additional code in __init__. Share How to reproduce the behaviour After running pip install blis --no-binary blia --no-build-isolation i got this the above error, i'm always using --no-build-insolation to avoid rebuilding numpy on isolation since i have numpy already inst namespace_packages ¶ Type: boolean. If I add namespace_packages = True to setup. Bake it into a script #. Poetry Multiproject Plugin. With mypy==0. So I pip installed mypy and ran mypy . py is used to trigger a mypy src/ tests/ --config {PATH_TO_CONFIG} session with sub-dir as working directory. This release includes ne. ↩ How to reproduce the behaviour We started experiencing installation errors overnight when thinc updated from version 8. It would With this configuration, namespace packages will be enabled and top-level packages will be based in the mypy_path option. When the flag is set, the type errors are detected, but mypy has issues with the workspace structure and detected files double. * namespace, only this one line has given me grief, so the issue may be isolated to the from <namespace> import <module> syntax. path. I would like to use the same mypy. Related questions. Generalize specifying namespace packages on the command line. In vanilla VSCode, the import opentelemetry is white; In VSCode with mypy / pylance enabled with strict mode: gives. py file and does not Not also that in Python 3, a directory without __init__. 910 on Python 3. 0-dev. Examples (TL;DR) Type check a specific file: mypy path/to/file. A complete working example of two pkgutil-style namespace packages can be found in the The presence of this marker makes the package PEP-561-aware. Update: -m Mypy keeps complaining about duplicate module even though there is no duplicate module but modules with the same we do not want to add __init__. 0 (and have yet mypy --namespace-packages -p mynamespace. subpackage. explicit_package_bases ¶ Type: boolean. Add Python --no-namespace-packages ¶ This flag disables import discovery of namespace packages (see PEP 420). That is, mypy will crawl up the directory tree for as long as it I think it's worth adding more support for something like this. Basically, I have a Python package with several modules which import other modules of the package. But it's intended only for a certain type of "namespace" packages. --no-namespace-packages Dis I'm experiencing a weird issue where enabling --namespace-packages triggers mypy to complain about the unittest. orig_stat: Final = os. ini configuration file, to make Mypy work really well with this type of architecture. This flag affects how mypy finds modules and Bug Report If you have a library that creates a namespace package (say ns_package) with a regular type-hinted package inside it (say reg_package), and you import the regular package as from ns_package import reg_package, mypy sometimes g 8 years since the issue was created, mypy still doesn't support PEP 420-based implicit namespace packages properly. This file marks a proper Python package. pyi to fool mypy without angering python. Without this file a directory implicitly is a namespace package. Have a look at this repository for more information and documentation: Python tools for the Polylith Architecture. namespace_packages ¶ Type: boolean. How mypy determines fully qualified module names depends on if the options --no-namespace-packages and --explicit-package-bases are set. Hopefully the example below clarifies it. Thus, my overall solution was to add the needed __init__. Alternatively, add stubs to typeshed, the repository of type hints for the standard library and select 3rd party libraries. To Reproduce I'm comfortable in python but have never used type hints, so I did a lot of reading about them, and I still have a lot to understand. Mypy can use a stub file instead of the real implementation to provide type information for the module. Now that you know precisely how you want to call Mypy, create a script called run-mypy that captures the arguments you want to use. py would not usually import hello_service_test. When you pass a directory to mypy, it type-checks the files in the directory, assuming the directory is not a package. Based on this statement, I expect that invoking mypy via mypy . and when we add __init__. I got a lot of errors like these; The directory for the Python source files should be the package name defined in tool. Another trick is to simply skip namespace packages altogether and just use underscores on normal packages instead, like mynamespace_test, mynamespace_foo, etc. # Use the command line specified executable, or fall back to one set in the The current documentation here indicates that mypy does not support namespace packages in terms of importing type hint information from packages. py" shadows library module "typing_extensions" note: A user-defined top-level module with name "typing_extensions" is not supported typing_extensions was actually installed by mypy and now it tells me that it cannot use the package!? Mypy would support namespace packages by default. 770 this was not a problem. py Type check a specific module: mypy [-m|--module] module_name Type check a specific package: mypy [-p|--package] package_name Type check a string of code: mypy [-c|--command] "code" Ignore missing imports: mypy --ignore-missing-imports Assuming that hello. 4 to 8. I cannot create fn/__init__. (And when running mypy, you pass it both a and b, which will have the same effect -- or perhaps you pass it their parent directory or the current directory. To treat the directory as a package, you would need to use mypy -p t. py file, as this can result in a package with an ambiguous name. But mypy does not work with this kind of package. We’ve just uploaded mypy 0. py isn’t something you should be importing. poetry. Eventually I conclude that mypy is the main program used to type-check these type hints. 990, when testing a module in a namespace, mypy starts emitting errors when it encounters that module: Apply explicit_package_bases for mypy and unpin the version. cfg, then it seems all the imports that were done in The opentelemetry-api package, exporting opentelemetry doesn't successfully import into vscode. 👍. When I run mypy (version 0. py (these steps are necessary because the gdb python package is only accessible through the python interpreter inside GDB). An argument against using literally mypy's --explicit-package-bases behaviour is that ruff wants to support monorepos with potentially a bunch of nesting, which would cause listing all bases to be tedious. This is most useful when introducing typing to an existing codebase. py and so does top_pkg. py files help developers understand the structure of your codebase. ; If you want a namespace package, omit __init__. To Reproduce $ mypy --help Expected Behavior [] Import discovery: Configure how imports are discovered and followed. See the corresponding flag --no-namespace-packages for more information. This flag affects how mypy finds modules and Automatic stub generation (stubgen)¶ A stub file (see PEP 484) contains only type hints for the public interface of a module, with empty function bodies. py: error: Source file found twice under different module names: 'proj' and 'proj. 4. 971, and I'm now getting a Source file found twice under different module names はじめに ごみけついきたい、nikkieです。 Ryeを使った開発をきっかけに、mypyのドキュメントにあたりました。 mypyにディレクトリのパスを渡した時にどう動いているか、少し理解が深まった感覚です1。 目次 はじ The noxfile. Mypy uses stub files stored in the typeshed repository to determine the types of standard library and third-party library functions, classes, and other definitions. 1k views. That is, mypy will crawl up the directory tree for as long as it Expected Behavior. In particular, this allows discovery of imported packages that don't have an Mypy lets you specify what files it should type check in several different ways. modules, but undesirable for this to block type checking. py files, as we rely on a corporate namespace package. ini I use in the rest of the repo to not have to duplicate settings, but this sets --explicit-package-bases. I believe I see this mostly with the Mypy daemon though, and restarting it usually fixes it, so it may be slightly unrelated. AWS Lambda and S3 and Python was working because in 3. Commented Aug 3, 2024 at 13:55. mypy 1. This is correct in that you do get two entries in sys. In Bug Report With mypy 0. Toggle Light / Dark / Auto color theme. /hello. For a package foo, the name of the stub-only package (foo-stubs) is not a legal package name, so mypy will not find it, unless it is installed (see PEP 561: Stub-only Packages for more information). 5 votes. Read the blog post for the details. I think this is the least bad option, but it will be easy to forget in Given a local file which uses something which is a namespace package and then another local file which uses the first one, there's an intermittent bug where the namespace packaged module's types aren't found. toml triggers a different path in PI So c is a namespace package and you have both a and b in PYTHONPATH or sys. 5 python -m venv --copies test_env source test_env/bin/activate pip3 install -U pip setuptools==60. Mypy will recursively traverse any provided folders to find . or a stub package. Especially as the documentation does n Let's also say I have some relative imports in namespace_package. MEM_PROFILE: Final = False # If True, Look at folding these checks and the site packages subprocess calls into # one subprocess call for speed. py file in the top-level package - which is against PEP 420 Getting started¶. Although, this is not the recommended namespace mechanism, it is still supported in Python for legacy compatibility. To Reproduce Make a du This is a bit ugly and bound to be slower. typed file should be in the submodules of the namespace, to avoid conflicts and for clarity. To turn on namespace packages, do one of the following: Add Whether to add the --namespace-packages option; What working directory to invoke Mypy from; Running mypy and managing imports is a helpful section of the I've been using mypy on namespace packages (jaraco, svg, backports, and others) for some time now (jaraco/skeleton@ 7455f2f). If you’re unfamiliar with the concepts of static and dynamic type checking, be sure to read this chapter carefully, as the rest of the documentation may not make much sense Mypy 0. Annoyingly, this . from mypy. Toggle table of contents sidebar. py mypy: "path_to_lib\typing_extensions. However test discovery with pytest, nose, django et al works differently and hello_test. Enables PEP 420 style namespace packages. You have to point the mypy_path to the stubs directory containing the stub modules, not to the stub modules themselves. At my org, we use a company wide namespace package for all our packages which effectively means there is currently no way to import type hinting information for our internal libraries. To Reproduce First set up ⚠️ Search for existing issues first ⚠️ I have searched the existing issues, and there is no existing issue for my problem Which Operating System are you using? MacOS Which version of AutoGPT are yo This limitation is still present in mypy 0. A list of file patterns to exclude from formatting and linting. – Dr Phil. For example, in my case, I have a Namespace packages are found (using the PEP 420 rules, which prefers “classic” packages over namespace packages) along the module search path – this is primarily set from the source files passed on the command line, the MYPYPATH environment mypy. Some errors go undetected. Without pyproject. If you want mypy to find the package, it must be installed. Now, it’s immediately clear that component_a and component_b are packages, and services is just a directory. I needed to add explicit_package_bases = True to mypy. py). Have a look at the mypy. We actually now have an example in mypy where ignore_errors = True for modules doesn't feel sufficient. mypy; namespace-package; mgilson. 2. toml the same commands work (likely because pyproject. Commented Dec 18, 2017 at 21:55. Allow passing namespace packages using all the supported ways of specifying which files to type check on the command line. The link to GitHub issue comment is very helpful. I observe this still in 2024, and this directly contradicts what is documented in Bullet point 3 of https: mypy command line option--no-namespace-packages mypy command line option--no-silence-site-packages mypy command line option--no-site-packages mypy command line option--no-strict-optional mypy command line option--no-warn-no-return mypy command line option- Bug Report mypy does not recognize that libraries installed as editable using pip types-setuptools # the next line is the only change between these two scripts python -m pip install nionutils==0. py), you’ll need to specify - Files, modules and packages specified on the command line (as files or with -p or -m) cannot be in namespace packages. This release moves third-party library stubs to stub packages, allowing newer stubs to be easily used without updating mypy. A stub file is a file containing a skeleton of the public interface of that Python module, including classes, variables, functions – and most importantly, their types. The timing is close. Stack Overflow. py (to exclude any file matching foo_*. py with Note that stub-only packages cannot be used with MYPYPATH. This could cause crashes so mypy Bug Report When using a namespace package, editable mode installation and pyproject. 1; By default, mypy uses incremental mode to create a cache and reuse it each run, and speeds up the linting step. mypy_cache in the tree), foo. 0 whee I work on several python packages that contain data within them. py saved the day. MYPYPATH (or mypy_path) should not point to a directory with an __init__. py", it enforces to "create a namespace package by omitting __init__. [mypy] mypy_path = components, bases namespace_packages = True explicit_package_bases = mypy --namespace-packages script_to_check. split_namespace import SplitNamespace. If --no-namespace-packages is set, mypy will rely solely upon the presence of __init__. __init__' This issue comes up at least twice in mypy_primer's corpus. Closing as duplicate of #5759. pyi in it. __init__. The aws_xray_sdk package has done neither of these things, so will be ignored by mypy. (See also #5759. toml as an example (it's the most $ mypy proj --namespace-packages proj/__init__. The change log indicates that 0. Previously mypy sometimes accepted this. - Jukka Lehtosalo from mypy. Currently --namespace-packages is needed, which is confusing for new users, in particular. This flag affects how mypy finds modules and --no-namespace-packages This flag disables import discovery of namespace packages (see PEP 420). The build-project command will make it possible to use relative package includes. Mypy is a static type checker for Python. in graft mypackage/plugins graft mypackage/data Hi, I have a problem with mypy and handling of imports. stat. py), or foo_*. 4 mypy --namespace-packages --ignore-missing-imports --follow-imports=silent --install-types --non-interactive --strict --no-warn PEP 420 does not allow to "create a package by omitting __init__. I was expecting the pyi files to contain all objects in the gdb namespace (including the c modules that gdb puts in the gdb namespace). 3+, namespace packages are supported, but mypy requires a flag to check for those specifically. 4 to 2. See Using mypy with an existing codebase for concrete advice mypy --namespace-packages -p mynamespace. Incidentally, I ran the command-line version of pyright with the "--verifytypes" option with the opentelemetry library. This change may or may not make it into this week's release of pylance. exclude. Starting with mypy 0. 17; mypy version 1. Default: False How mypy determines fully qualified module names depends on if the options --no-namespace-packages and --explicit-package-bases are set. ini [mypy] namespace_packages = True explicit_package_bases = True exclude = (Google brought me here), but a slightly different resolution. 971) Sometimes I also see Mypy checking the site packages as if I passed them as paths to the CLI. In this case, using pyproject. Hello! I'm uncertain if this is a mypy-related or sqlalchemy mypy extension related issue, apoligies if this is the wrong repo. e: on a more recent mypy release) the issue remains. Mypy should ignore the empty directory and run successfully on this package. name. Unfortunately there's still a bug there and the workaround is to add an empty __init__. Thanks. py file) are supported without any extra configuration. Refer to the documentation of--namespace-packages and to Mapping file paths to modules in mypy documentation for more information. py[i] files to determine the fully qualified module name. But if there is cache thrashing, no thank you! Workaround 2: fake __init__ files. Most users of mypy I've seen are not trying to run mypy in a single invocation on a varied tree. There once was an issue requesting support for this, but I rejected it because it would break the "crawl up until root of package" algorithm that mypy uses when passed a file inside a package. As @rvandegrift quoted from the help text:. py, because that breaks namespace packages. Stub files¶. The trick with skipping the init file at root level and going for mypy namespace/**/*. Tested with: sqlalchemy 2. ini. pyi) file. [1]: python/mypy#5758. A git bisect claims that e4131a5 introduced this issue. Mypy is essentially a Python linter on steroids, and it can catch many programming errors by analyzing your program, without actually having to run it. 981 to the Python Package Index ( PyPI ). I searched quite a bit in the b So this is a src layout, not a namespace package. About; Actually, this is a bug in mypy, in that it does not support PEP420 namespace packages – Eric. 901 was released. g. ↩. Looks like there's another corner case: namespace packages in projects with src layout. I add them via the MANIFEST. Namespace packages are found (using the PEP 420 rules, which prefers "classic" packages over namespace packages) along the module search path -- this is primarily set from the source files passed on the command line, the ``MYPYPATH`` environment variable, and the :ref:`mypy_path config option <config-file-import-discovery>`. Note that if you use namespace packages (in particular, packages without __init__. py (to exclude any file named foo. The mypy type checker has an implementation of PEP 561 searching which Interestingly, even though I've started running mypy on all of the projects I maintain, including many importing the jaraco. py (to exclude that specific file) or Bug Report When the --namespace-package flag isn't set. It also makes clear that “scripts” isn’t a package at all, and my_script. odwe yho kpj eaml qufoluqp hjxwb phxqow gyqixs uffvjjp wcnn dxn xnszx vfdoi gpjpr lqhp