I'm encountering a peculiar issue when using Python's exec function within scripts that are run across different Git worktrees. Specifically, I've observed that the behavior of exec (and by extension, ...

To be clear, I'm not suggesting anyone actually should import pkg.__init__ directly. This is to understand potential pitfalls if someone decides to convert a module-only distribution into a package, ...

Python docs on the dis module state that the length of a python bytecode instruction in CPython is 2 bytes (https://docs.python.org/3/library/dis.html) However, when I disassemble a function and look ...

I am unable to find anything on the official Python documentation whether L[a:b] = L[c:d] creates a new (temporary) list for L[c:d] before the in-place modification of L. The tutorial says that: All ...

Since os is a module instead of a package, import os.path should fail. For comparison: >>> import os.sys Traceback (most recent call last): File "<python-input-0>", line 1, ...

I am wondering how self works under-the-hood in Python classes. My current limited understanding is that when a class is defined, e.g. class Foo: def __init__(self, x: int): self.x = x ...

My Python code stores millions of ids in various data structures, in order to implement a classic algorithm. The run time is good, but the memory usage is awful. These ids are ints. I assume that ...

I define a class attribute and give it a function. When I call this function, the instance is passed on as the first argument (as if it's an instance function call with a self). I would not expect an ...

I am investigating the performance impact of a very broad inheritance setup. Start with 260 distinct attribute names, from a0 through z9. Create 260 classes with 1 uniquely-named attribute each. ...

Sets are unordered, or rather their order is an implementation detail. I'm interested in that detail. And I saw a case that surprised me: print({2, 3, 10}) x = 2 print({x, 3, 10}) Output (Attempt ...

I would like to dynamically create and import modules inside an inner __init__.py file, if one or several of a set of indexed submodules doesn't exist. I have a set of module layers, say; top_module/ ...

With lst = [0] * 10**6 I get times like these: 5.4 ± 0.4 ms bytearray(lst) 5.6 ± 0.4 ms bytes(bytearray(lst)) 13.1 ± 0.7 ms bytes(lst) Python: 3.13.0 (main, Nov 9 2024, 10:04:25) [GCC 14.2.1 ...

I was exploring the Python 3.11 source code and came across the _PyCode_CODE macro. I noticed that within this macro, the co_code_adaptive member of PyCodeObject is cast to a uint16_t* pointer. ...

I just read PEP 393 and learned that Python's str type uses different internal representations, depending on the content. So, I experimented a little bit and was a bit surprised by the results: >&...

In newer versions, ROT_TWO is replaced by SWAP. However, after disassembling the function using dis.dis(), I noticed that SWAP does not appear in the bytecode. Python 3.9.0 >>> import dis >...