6/20/2023 0 Comments Numpy copy fast![]() Tl dr Python has to do many more operations than you think in a simple loop, and Numpy can use high-performance libraries that are insanely fast (much faster than naive C code, even C code written by a very competent programmer). So there are two reasons why Numpy is fast: The core idea of Numpy is to circumvent this expensive copies by always managing the data in a C compatible data structure in the background, while presenting you a pythonic list alike interface to work with it. For each function call into C you'd have to copy it into a continuous piece of memory to make it accessible for C. In case of a matrix, imagine a list of lists, where each row is a list. You often face the situation that you have to copy your data into a data structure that the C function can handle. A related approach is to use cython, which lets you code in a python alike language, generates C code from it and AFAIK uses the C-API to bind it. When your code is too slow you usually code a function in a static language ( C or Fortran ) and bind it to python via its C-API or ctypes. Long Answer: Loops and function calls are dog slow in dynamic languages, unless JITed, then they are just slow (except for luajit2, I hear). Short Answer: Yes, Numpy uses C and Fortran for the expensive computations and this is what makes it so fast. Introduction to Programming with Python (from Microsoft Virtual Academy)./r/git and /r/mercurial - don't forget to put your code in a repo!./r/pyladies (women developers who love python)./r/coolgithubprojects (filtered on Python projects)./r/pystats (python in statistical analysis and machine learning)./r/inventwithpython (for the books written by /u/AlSweigart)./r/pygame (a set of modules designed for writing games)./r/django (web framework for perfectionists with deadlines). ![]() /r/pythoncoding (strict moderation policy for 'programming only' articles).NumPy & SciPy (Scientific computing) & Pandas.Transcrypt (Hi res SVG using Python 3.6 and turtle module).Brython (Python 3 implementation for client-side web programming).PythonAnywhere (basic accounts are free).(Evolved from the language-agnostic parts of IPython, Python 3).The Python Challenge (solve each level through programming).Problem Solving with Algorithms and Data Structures.Invent Your Own Computer Games with Pythonįive life jackets to throw to the new coder (things to do after getting a handle on python) Please use the flair selector to choose your topic.Īdd 4 extra spaces before each line of code def fibonacci(): Reddit filters them out, so your post or comment will be lost. If you are about to ask a "how do I do this in python" question, please try r/learnpython, the Python discord, or the #python IRC channel on Libera.chat. News about the dynamic, interpreted, interactive, object-oriented, extensible programming language Python Current Events
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