cpython

I recently installed lxml . Before that I had to install all the dependencies for that. So I tried to install liblxml2-dev , liblxslt1-dev and python-dev (google searched for what packages are required for lxml ) but even after that I could not able to install lxml by using the command pip install lxml . However as because I am using Python 3.4.0, I thought that may be there are different version of python-dev (thought came due to facing some similar version conflict problem). So I tried to install python3-dev . Then I tried to install lxml using the same command said earlier and that worked!!

I came across this - in my view - strange behaviour: "a b c".split(maxsplit=1) TypeError: split() takes no keyword arguments Why does str.split() not take keyword arguments, even though it would make sense? I found this behavior both in Python2 and Python3. See this bug and its superseder . str.split() is a native function in CPython, and as such exhibits the behavior described here : CPython implementation detail: An implementation may provide built-in functions whose positional parameters do not have names, even if they are ‘named’ for the purpose of documentation, and which therefore cannot

With reference to the following link: http://docs.python.org/faq/library.html#what-kinds-of-global-value-mutation-are-thread-safe I wanted to know if the following: (x, y) = (y, x) will be guaranteed atomic in cPython. (x and y are both python variables) Let's see: >>> x = 1 >>> y = 2 >>> def swap_xy(): ... global x, y ... (x, y) = (y, x) ... >>> dis.dis(swap_xy) 3 0 LOAD_GLOBAL 0 (y) 3 LOAD_GLOBAL 1 (x) 6 ROT_TWO 7 STORE_GLOBAL 1 (x) 10 STORE_GLOBAL 0 (y) 13 LOAD_CONST 0 (None) 16 RETURN_VALUE It doesn't appear that they're atomic: the values of x and y could be changed by another thread

I don't really get the concept of "bytecode interpreter" in the context of CPython. Can someone shed some light over the whole picture? Does it mean that CPython will compile and execute pyc file (bytecode file?). Then what compile py file to pyc file? And how is Jython different from CPython (except they are implemented in different languages). I also read somewhere that Python is C++ interpretation. Is this correct? And what does that mean? I'm still very new to Python, so forgive me if I ask the dumb questions... Thank you so much! CPython is the implementation of Python in C. It's the

This is a post inspired from this comment about how memory is allocated for objects in CPython. Originally, this was in the context of creating a list and appending to it in a for loop vis a vis a list comprehension. So here are my questions: how many different allocaters are there in CPython? what is the function of each? when is malloc acutally called? (a list comprehension may not result in a call to malloc , based on what's said in this comment How much memory does python allocate for itself at startup? are there rules governing which data structures get first "dibs" on this memory? What

I've been hearing a lot about the PyPy project. 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 . If PyPy can solve these great challenges, what are its weaknesses that are preventing wider adoption? That is to say, what's preventing someone like me, a typical Python developer, from switching to PyPy right