c2f 0.0.2

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TODO

• Add README sections for release workflow

• Use Sphinx: build docs for zoom-ability

• Add note about configuring secrets

Is Python interpreted or compiled?

c2f.py

# cython: language_level=3
"Celsius to Fahrenheit Library"

def convert(celsius: float) -> float:
    "Convert Celsius to Fahrenheit"
    fahrenheit = celsius * 1.8 + 32
    return fahrenheit

setup.py

from setuptools import setup
from Cython.Build import cythonize

setup(
    name='c2f',
    version='0.0.0',
    py_modules=['c2f'],
    ext_modules=cythonize('c2f.py'),
)

c2f.cpython-38.pyc

>>> dis.dis(c2f.convert)
  6           0 LOAD_FAST                0 (celsius)
              2 LOAD_CONST               1 (1.8)
              4 BINARY_MULTIPLY
              6 LOAD_CONST               2 (32)
              8 BINARY_ADD
             10 STORE_FAST               1 (fahrenheit)
  7          12 LOAD_FAST                1 (fahrenheit)
             14 RETURN_VALUE

c2f.c

$ cython c2f.py

static PyObject * __pyx_pf_3c2f_convert(double __pyx_v_celsius) {
  double __pyx_v_fahrenheit;
  PyObject *__pyx_r = NULL;
  __pyx_v_fahrenheit = ((__pyx_v_celsius * 1.8) + 32.0);
  __pyx_r = PyFloat_FromDouble(__pyx_v_fahrenheit);
  return __pyx_r;
}

c2f.so

$ pip install wheel
$ python setup.py bdist_wheel

___pyx_pw_3c2f_1convert:
push   rbp
mov    rbp, rsp
sub    rsp, 16
movsd  xmm0, qword ptr [rbp - 8]
mulsd  xmm0, qword ptr [rip + 1379]
addsd  xmm0, qword ptr [rip + 1379]
call   502 <PyFloat_FromDouble ...>
add    rsp, 16
pop    rbp
ret

GitHub Workflow

Summmary

Is Python an interpreted or compiled language? Trick question. It’s actually both. With tools like Cython, we can take the compilation step further and remove the interpreter loop almost entirely. Cython produces binaries much like C++, Go, and Rust do. Now with GitHub Actions the cross-platform build and release process can be automated for free for Open Source projects. This is an enormous opportunity to make the Python ecosystem 20-50% faster with a single pull request. The lightning talk will walk through a GitHub workflow that publishes Cython-optimized wheels to PyPI. Discover how Cython can turbo-charge your Python code and GitHub Actions can simplify your cross-platform release process for free.

Appendix

$ gcc -g -shared -pthread -fPIC -fwrapv -O2 -Wall -fno-strict-aliasing -I/Library/Frameworks/Python.framework/Versions/3.8/include/python3.8 -L/Library/Frameworks/Python.framework/Versions/3.8/lib -o c2f.so c2f.c -lpython3.8
$ objdump -S -df=___pyx_pw_3c2f_1convert c2f.so