mypyc VS typeguard

Compare mypyc vs typeguard and see what are their differences.

mypyc

Compile type annotated Python to fast C extensions (by mypyc)

typeguard

Run-time type checker for Python (by agronholm)
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mypyc typeguard
25 7
1,661 1,415
2.0% -
0.0 8.2
12 months ago 5 days ago
Python
- GNU General Public License v3.0 or later
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

mypyc

Posts with mentions or reviews of mypyc. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-05-21.

typeguard

Posts with mentions or reviews of typeguard. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-01-24.
  • Returning to snake's nest after a long journey, any major advances in python for science ?
    7 projects | /r/Python | 24 Jan 2023
    As other folks have commented, type hints are now a big deal. For static typing the best checker is pyright. For runtime checking there is typeguard and beartype. These can be integrated with array libraries through jaxtyping. (Which also works for PyTorch/numpy/etc., despite the name.)
  • Boring Python: Code Quality
    14 projects | news.ycombinator.com | 20 Dec 2022
    I got good use of the run-time type checking of typeguard [0] when I recently invoked it via its pytest plugin [2]. For all code visited in the test suite, you get a failing test whenever an actual type differs from an annotated type.

    [0]: https://github.com/agronholm/typeguard/

    [1]: https://typeguard.readthedocs.io/en/latest/userguide.html#us...

  • Im listening...
    5 projects | /r/ProgrammerHumor | 16 Aug 2022
    But you can use a library like typeguard to get runtime typechecking. Or run mypy over the code to get static typechecking.
  • Python’s “Type Hints” are a bit of a disappointment to me
    15 projects | news.ycombinator.com | 21 Apr 2022
    Every point in this blog post strikes me as either (1) unaware of the tooling around python typing other than mypy, or (2) a criticism of static-typing-bolted-on-to-a-dynamically-typed-language, rather than Python's hints. Regarding (1), my advise to OP is to try out Pyright, Pydantic, and Typeguard. Pyright, especailly, is amazing and makes the process of working with type hints 2 or 3 times smoother IMO. And, I don't think points that fall under (2) are fair criticisms of type *hints*. They are called hints for a reason.

    Otherwise, here's a point-by-point response, either recommending OP checks out tooling, or showing that the point being made is not specific to Python.

    > type hints are not binding.

    There are projects [0][1] that allow you to enforce type hints at runtime if you so choose.

    It's worth mentioning that this is very analogous to how Typescript does it, in that type info is erased completely at runtime.

    > Type checking is your job after all, ...[and that] requires maintenance.

    There are LSPs like Pyright[2] (pyright specifically is the absolute best, IMO) that report type errors as you code. Again, this is very very similar to typescript.

    > There is an Any type and it renders everything useless

    I have never seen a static-typing tool that was bolted on to a dynamically typed language, without an `Any` type, including typescript.

    > Duck type compatibility of int and float

    The author admits that they cannot state why this behavior is problematic, except for saying that it's "ambiguous".

    > Most projects need third-party type hints

    Again, this is a criticism of all cases where static types are bolted on dynamically typed languages, not Python's implementation specifically.

    > Sadly, dataclasses ignore type hints as well

    Pydantic[3] is an amazing data parsing library that takes advantage of type hints, and it's interface is a superset of that of dataclasses. What's more, it underpins FastAPI[4], an amazing API-backend framework (with 44K Github stars).

    > Type inference and lazy programmers

    The argument of this section boils down to using `Any` as a generic argument not being an error by default. This is configurable to be an error both in Pyright[5], and mypy[6].

    > Exceptions are not covered [like Java]

    I can't find the interview/presentation, but Guido Van Rossum specifically calls out Java's implementation of "exception annotations" as a demonstration of why that is a bad idea, and that it would never happen in Python. I'm not saying Guido's opinion is the absolute truth, but just letting you know that this is an explicit decision, not an unwanted shortcoming.

    [0] https://github.com/RussBaz/enforce

    [1] https://github.com/agronholm/typeguard

    [2] https://github.com/microsoft/pyright

    [3] https://pydantic-docs.helpmanual.io

    [4] https://github.com/tiangolo/fastapi

    [5] https://github.com/microsoft/pyright/blob/main/docs/configur...

    [6] https://mypy.readthedocs.io/en/stable/config_file.html#confv...

  • Statically typed Python
    7 projects | /r/Python | 30 Nov 2021
    Personally I find working around mypy's quirks to be more effort than it's worth, so to offer another option: typeguard or beartype can be used to perform run-time type checking.
  • Tests aren’t enough: Case study after adding type hints to urllib3
    4 projects | news.ycombinator.com | 18 Oct 2021
    Never checked? They're statically checked.

    Also, tooling like https://pydantic-docs.helpmanual.io/ can do runtime checking for important parts of your app or you can add use this https://github.com/agronholm/typeguard to enforce all types at runtime (although I haven't measured the performance impact, probably something to do in a separate environment than production?).

  • DoorDash: Migrating From Python to Kotlin for Our Backend Services
    13 projects | /r/programming | 5 May 2021
    typeguard

What are some alternatives?

When comparing mypyc and typeguard you can also consider the following projects:

Cython - The most widely used Python to C compiler

beartype - Unbearably fast near-real-time hybrid runtime-static type-checking in pure Python.

mypy - Optional static typing for Python

CPython - The Python programming language

pex - A tool for generating .pex (Python EXecutable) files, lock files and venvs.

pyccel - Python extension language using accelerators

pydantic - Data validation using Python type hints

typed_python - An llvm-based framework for generating and calling into high-performance native code from Python.

mypyc-benchmark-results - Mypyc benchmark result data

benchmarks - Some benchmarks of different languages

nogil - Multithreaded Python without the GIL