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1. stackoverflow.com › questions › 18946662Why shouldn't I use PyPy over CPython if PyPy is 6.3 times ...

   stackoverflow.com › questions › 18946662

   Sep 23, 2013 · If PyPy succeeds to be better than CPython in general, which is questionable, the main weakness affecting its wider adoption will be its compatibility with CPython. There also exist issues such as the fact that CPython runs on a wider range of CPUs and OSes, but these issues are much less important compared to PyPy's performance and CPython-compatibility goals.

2. pypy.org › compatPython compatibility - PyPy

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   The main difference in pure-python code that is not going to be fixed is that PyPy does not support refcounting semantics for "automatically" releasing state when an object's __del__ is called. The following code won't fill the file immediately, but only after a certain period of time, when the GC does a collection and flushes the output, since the file is only closed when the __del__ method ...

3. doc.pypy.org › en › latestDownloading and Installing PyPy — PyPy documentation

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   3 days ago · Download a pre-built PyPy¶ The quickest way to start using PyPy is to download a prebuilt binary for your OS and architecture. You may be able to use either use the most recent release or one of our development nightly build. Please note that the nightly builds are not guaranteed to be as stable as official releases, use them at your own risk.

4. doc.pypy.org › en › latestFrequently Asked Questions — PyPy documentation

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   3 days ago · This includes subtle decisions about whether some effects are ok or not for the user (i.e. the Python programmer). CPython has additionally the problem (1) of reference counting. With PyPy, this sub-problem is simpler: we need to make our GC multithread-aware. This is easier to do efficiently in PyPy than in CPython.

5. pypy.org › download_advancedDownload (advanced) - PyPy

   pypy.org › download_advanced

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   More generally you may be just a little bit low of RAM. First note that 2 GB is really not enough nowadays; on Windows you first need to refer to the Windows build instructions. More precisely, translation on 32-bit takes at this point 2.7 GB if PyPy is used and 2.9 GB if CPython is used. There are two workarounds: 1. use PyPy, not CPython.

6. doc.pypy.org › en › latestDifferences between PyPy and CPython

   doc.pypy.org › en › latest

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   On CPython 2.6 and 2.7 it works in a bit more cases, which are not supported by PyPy so far. (If needed, it could be supported, but then it will likely work in many more case on PyPy than on CPython 2.6/2.7.) In PyPy 3, __class__ attribute assignment between heaptypes and non heaptypes.

7. People also ask

   Does PyPy run on CPython?

   • PyPy is written in Restricted Python. It does not run on top of the CPython interpreter, as far as I know. Restricted Python is a subset of the Python language. AFAIK, the PyPy interpreter is compiled to machine code, so when installed it does not utilize a python interpreter at runtime.

   PyPy -- How can it possibly beat CPython? - Stack Overflow

   stackoverflow.com/questions/2591879/pypy-how-can-it-possibly-beat-cpython

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   Why is PyPy not compatible with CPython?

   • A: PyPy isn't 100% compatible with CPython because it isn't simulating CPython under the hood. Some programs may still depend on CPython's unique features that are absent in PyPy such as C bindings, C implementations of Python object&methods, or the incremental nature of CPython's garbage collector.

   Why shouldn't I use PyPy over CPython if PyPy is 6.3 times faster?

   stackoverflow.com/questions/18946662/why-shouldnt-i-use-pypy-over-cpython-if-pypy-is-6-3-times-faster

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   Is PyPy 3.8+ compatible with Windows PyPy?

   • Windows PyPy3.5 v6.0, the latest as of December 2018, is in beta. To cite the Zen of Python: Readability counts. For example, Python 3.8 introduced fstring =. There might be other features in Python 3.8+ which are more important to you. PyPy does not support Python 3.8+ at the moment.

   Why shouldn't I use PyPy over CPython if PyPy is 6.3 times faster?

   stackoverflow.com/questions/18946662/why-shouldnt-i-use-pypy-over-cpython-if-pypy-is-6-3-times-faster

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   Does PyPy support Python 3?

   • PyPy does not yet fully support Python 3.x, although that is an active work item. PyPy is a great project, but runtime speed on CPU-intensive tasks isn't everything, and in many applications it's the least of many concerns.

   Why wasn't PyPy included in standard Python? - Stack Overflow

   stackoverflow.com/questions/12867263/why-wasnt-pypy-included-in-standard-python

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   Could PyPy be merged into CPython?

   • PyPy is not a fork of CPython, so it could never be merged directly into CPython. Theoretically the Python community could universally adopt PyPy, PyPy could be made the reference implementation, and CPython could be discontinued. However, PyPy has its own weaknesses:

   Why wasn't PyPy included in standard Python? - Stack Overflow

   stackoverflow.com/questions/12867263/why-wasnt-pypy-included-in-standard-python

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   Is PyPy faster than CPython?

   • They claim it is 6.3 times faster than the CPython interpreter on their site. Whenever we talk about dynamic languages like Python, speed is one of the top issues. To solve this, they say PyPy is 6.3 times faster. The second issue is parallelism, the infamous Global Interpreter Lock (GIL). For this, PyPy says it can give GIL-less Python.

   Why shouldn't I use PyPy over CPython if PyPy is 6.3 times faster?

   stackoverflow.com/questions/18946662/why-shouldnt-i-use-pypy-over-cpython-if-pypy-is-6-3-times-faster

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8. pypy.orgPyPy

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   Memory usage: memory-hungry Python programs (several hundreds of MBs or more) might end up taking less space than they do in CPython. Compatibility: PyPy is highly compatible with existing python code. It supports cffi, cppyy, and can run popular python libraries like twisted, and django. It can also run NumPy, Scikit-learn and more via a c ...