First, you can’t just transport straight C for loops into Python. There has to be some concession to Python syntax. The initial attempt was clever but not clever enough. However, the disassembly ...

a while loop is used when the number of iterations is uncertain. Note: The if statement is like a single iteration of a loop; it is used to trigger a reaction to certain conditions, or respond to an ...

If you want speed, use C, not Python. But for Pythonistas ... Don’t write a loop that calls a “Cythonized” function repeatedly; implement the loop in Cython and pass the data all at once.

The point is that Python has a way to economically express things like loops that iterate over ... Most any external code that exposes a C-compatible foreign function interface can be accessed ...