ribosome_to_python.py

import jinja2

data = {
    "EINVAL": "Invalid value",
    "EMFILE": "Too many open files",
    "EINTR": "Interrupted by a signal"
}

with open('errno.h', 'wt') as f:
    f.write(jinja2.Template("""
{% set errnum = 1 %}
{% for name in root %}
#define {{ name }} {{ errnum }}
{%- set errnum = errnum + 1 %}
{%- endfor %}
""").render(root=data))

with open('strerror.c', 'wt') as f:
    f.write(jinja2.Template("""
#include <errno.h>

char *strerror(int errnum) {
    switch(errnum) {
{%- for name, text in root.items() %}
    case {{ name }}:
        return "{{ text }}";
{%- endfor %}
    default:
        return "Unknown error";
    }
}
""").render(root=data))